44

我在这里使用公认的解决方案将 excel 工作表转换为数据表。如果我有“完美”的数据,这很好用,但如果我的数据中间有一个空白单元格,它似乎在每一列中都放了错误的数据。

我认为这是因为在下面的代码中:

row.Descendants<Cell>().Count()

是填充单元格的数量(不是所有列)和:

GetCellValue(spreadSheetDocument, row.Descendants<Cell>().ElementAt(i));

似乎找到了下一个填充单元格(不一定是该索引中的内容),因此如果第一列为空并且我调用 ElementAt(0),它会返回第二列中的值。

这是完整的解析代码。

DataRow tempRow = dt.NewRow();

for (int i = 0; i < row.Descendants<Cell>().Count(); i++)
{
    tempRow[i] = GetCellValue(spreadSheetDocument, row.Descendants<Cell>().ElementAt(i));
    if (tempRow[i].ToString().IndexOf("Latency issues in") > -1)
    {
        Console.Write(tempRow[i].ToString());
    }
}
4

14 回答 14

46

这是有道理的,因为 Excel 不会为空单元格存储值。如果您使用 Open XML SDK 2.0 Productivity Tool 打开文件并将 XML 向下遍历到单元格级别,您将看到只有具有数据的单元格才会出现在该文件中。

您的选择是在要遍历的单元格范围内插入空白数据,或者以编程方式确定单元格被跳过并适当调整索引。

我在单元格引用 A1 和 C1 中制作了一个带有字符串的示例 excel 文档。然后,我在 Open XML Productivity Tool 中打开了 excel 文档,这是存储的 XML:

<x:row r="1" spans="1:3" 
   xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
  <x:c r="A1" t="s">
    <x:v>0</x:v>
  </x:c>
  <x:c r="C1" t="s">
    <x:v>1</x:v>
  </x:c>
</x:row>

在这里,您将看到数据对应于第一行,并且该行只保存了两个单元格的数据。保存的数据对应于 A1 和 C1 并且没有保存具有空值的单元格。

要获得所需的功能,您可以像上面那样遍历 Cells,但您需要检查 Cell 引用的值并确定是否跳过了任何 Cells。为此,您将需要两个实用函数来从单元格引用中获取列名,然后将该列名转换为从零开始的索引:

    private static List<char> Letters = new List<char>() { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ' ' };

    /// <summary>
    /// Given a cell name, parses the specified cell to get the column name.
    /// </summary>
    /// <param name="cellReference">Address of the cell (ie. B2)</param>
    /// <returns>Column Name (ie. B)</returns>
    public static string GetColumnName(string cellReference)
    {
        // Create a regular expression to match the column name portion of the cell name.
        Regex regex = new Regex("[A-Za-z]+");
        Match match = regex.Match(cellReference);

        return match.Value;
    }

    /// <summary>
    /// Given just the column name (no row index), it will return the zero based column index.
    /// Note: This method will only handle columns with a length of up to two (ie. A to Z and AA to ZZ). 
    /// A length of three can be implemented when needed.
    /// </summary>
    /// <param name="columnName">Column Name (ie. A or AB)</param>
    /// <returns>Zero based index if the conversion was successful; otherwise null</returns>
    public static int? GetColumnIndexFromName(string columnName)
    {
        int? columnIndex = null;

        string[] colLetters = Regex.Split(columnName, "([A-Z]+)");
        colLetters = colLetters.Where(s => !string.IsNullOrEmpty(s)).ToArray();

        if (colLetters.Count() <= 2)
        {
            int index = 0;
            foreach (string col in colLetters)
            {
                List<char> col1 = colLetters.ElementAt(index).ToCharArray().ToList();
                int? indexValue = Letters.IndexOf(col1.ElementAt(index));

                if (indexValue != -1)
                {
                    // The first letter of a two digit column needs some extra calculations
                    if (index == 0 && colLetters.Count() == 2)
                    {
                        columnIndex = columnIndex == null ? (indexValue + 1) * 26 : columnIndex + ((indexValue + 1) * 26);
                    }
                    else
                    {
                        columnIndex = columnIndex == null ? indexValue : columnIndex + indexValue;
                    }
                }

                index++;
            }
        }

        return columnIndex;
    }

然后您可以遍历单元格并检查单元格引用与 columnIndex 的比较。如果小于,则将空白数据添加到 tempRow,否则只需读取单元格中包含的值。(注意:我没有测试下面的代码,但总体思路应该会有所帮助):

DataRow tempRow = dt.NewRow();

int columnIndex = 0;
foreach (Cell cell in row.Descendants<Cell>())
{
   // Gets the column index of the cell with data
   int cellColumnIndex = (int)GetColumnIndexFromName(GetColumnName(cell.CellReference));

   if (columnIndex < cellColumnIndex)
   {
      do
      {
         tempRow[columnIndex] = //Insert blank data here;
         columnIndex++;
      }
      while(columnIndex < cellColumnIndex);
    }
    tempRow[columnIndex] = GetCellValue(spreadSheetDocument, cell);

    if (tempRow[i].ToString().IndexOf("Latency issues in") > -1)
    {
       Console.Write(tempRow[i].ToString());
    }
    columnIndex++;
}
于 2010-10-20T18:50:03.200 回答
20

这是一个IEnumerable应该做你想要的,编译和单元测试的实现。

    ///<summary>returns an empty cell when a blank cell is encountered
    ///</summary>
    public IEnumerator<Cell> GetEnumerator()
    {
        int currentCount = 0;

        // row is a class level variable representing the current
        // DocumentFormat.OpenXml.Spreadsheet.Row
        foreach (DocumentFormat.OpenXml.Spreadsheet.Cell cell in
            row.Descendants<DocumentFormat.OpenXml.Spreadsheet.Cell>())
        {
            string columnName = GetColumnName(cell.CellReference);

            int currentColumnIndex = ConvertColumnNameToNumber(columnName);

            for ( ; currentCount < currentColumnIndex; currentCount++)
            {
                yield return new DocumentFormat.OpenXml.Spreadsheet.Cell();
            }

            yield return cell;
            currentCount++;
        }
    }

以下是它所依赖的函数:

    /// <summary>
    /// Given a cell name, parses the specified cell to get the column name.
    /// </summary>
    /// <param name="cellReference">Address of the cell (ie. B2)</param>
    /// <returns>Column Name (ie. B)</returns>
    public static string GetColumnName(string cellReference)
    {
        // Match the column name portion of the cell name.
        Regex regex = new Regex("[A-Za-z]+");
        Match match = regex.Match(cellReference);

        return match.Value;
    }

    /// <summary>
    /// Given just the column name (no row index),
    /// it will return the zero based column index.
    /// </summary>
    /// <param name="columnName">Column Name (ie. A or AB)</param>
    /// <returns>Zero based index if the conversion was successful</returns>
    /// <exception cref="ArgumentException">thrown if the given string
    /// contains characters other than uppercase letters</exception>
    public static int ConvertColumnNameToNumber(string columnName)
    {
        Regex alpha = new Regex("^[A-Z]+$");
        if (!alpha.IsMatch(columnName)) throw new ArgumentException();

        char[] colLetters = columnName.ToCharArray();
        Array.Reverse(colLetters);

        int convertedValue = 0;
        for (int i = 0; i < colLetters.Length; i++)
        {
            char letter = colLetters[i];
            int current = i == 0 ? letter - 65 : letter - 64; // ASCII 'A' = 65
            convertedValue += current * (int)Math.Pow(26, i);
        }

        return convertedValue;
    }

把它扔到课堂上试一试。

于 2011-07-12T03:52:35.230 回答
20

这是Waylon 答案的略微修改版本,它也依赖于其他答案。它将他的方法封装在一个类中。

我变了

IEnumerator<Cell> GetEnumerator()

IEnumerable<Cell> GetRowCells(Row row)

这是类,您不需要实例化它,它只是用作实用程序类:

public class SpreedsheetHelper
{
    ///<summary>returns an empty cell when a blank cell is encountered
    ///</summary>
    public static IEnumerable<Cell> GetRowCells(Row row)
    {
        int currentCount = 0;

        foreach (DocumentFormat.OpenXml.Spreadsheet.Cell cell in
            row.Descendants<DocumentFormat.OpenXml.Spreadsheet.Cell>())
        {
            string columnName = GetColumnName(cell.CellReference);

            int currentColumnIndex = ConvertColumnNameToNumber(columnName);

            for (; currentCount < currentColumnIndex; currentCount++)
            {
                yield return new DocumentFormat.OpenXml.Spreadsheet.Cell();
            }

            yield return cell;
            currentCount++;
        }
    }

    /// <summary>
    /// Given a cell name, parses the specified cell to get the column name.
    /// </summary>
    /// <param name="cellReference">Address of the cell (ie. B2)</param>
    /// <returns>Column Name (ie. B)</returns>
    public static string GetColumnName(string cellReference)
    {
        // Match the column name portion of the cell name.
        var regex = new System.Text.RegularExpressions.Regex("[A-Za-z]+");
        var match = regex.Match(cellReference);

        return match.Value;
    }

    /// <summary>
    /// Given just the column name (no row index),
    /// it will return the zero based column index.
    /// </summary>
    /// <param name="columnName">Column Name (ie. A or AB)</param>
    /// <returns>Zero based index if the conversion was successful</returns>
    /// <exception cref="ArgumentException">thrown if the given string
    /// contains characters other than uppercase letters</exception>
    public static int ConvertColumnNameToNumber(string columnName)
    {
        var alpha = new System.Text.RegularExpressions.Regex("^[A-Z]+$");
        if (!alpha.IsMatch(columnName)) throw new ArgumentException();

        char[] colLetters = columnName.ToCharArray();
        Array.Reverse(colLetters);

        int convertedValue = 0;
        for (int i = 0; i < colLetters.Length; i++)
        {
            char letter = colLetters[i];
            int current = i == 0 ? letter - 65 : letter - 64; // ASCII 'A' = 65
            convertedValue += current * (int)Math.Pow(26, i);
        }

        return convertedValue;
    }
}

现在您可以通过这种方式获取所有行的单元格:

// skip the part that retrieves the worksheet sheetData
IEnumerable<Row> rows = sheetData.Descendants<Row>();
foreach(Row row in rows)
{
    IEnumerable<Cell> cells = SpreedsheetHelper.GetRowCells(row);
    foreach (Cell cell in cells)
    {
         // skip part that reads the text according to the cell-type
    }
}

它将包含所有单元格,即使它们是空的。

于 2014-03-20T11:15:14.060 回答
5

查看我的实现:

  Row[] rows = worksheet.GetFirstChild<SheetData>()
                .Elements<Row>()
                .ToArray();

  string[] columnNames = rows.First()
                .Elements<Cell>()
                .Select(cell => GetCellValue(cell, document))
                .ToArray();

  HeaderLetters = ExcelHeaderHelper.GetHeaderLetters((uint)columnNames.Count());

  if (columnNames.Count() != HeaderLetters.Count())
  {
       throw new ArgumentException("HeaderLetters");
  }

  IEnumerable<List<string>> cellValues = GetCellValues(rows.Skip(1), columnNames.Count(), document);

//Here you can enumerate through the cell values, based on the cell index the column names can be retrieved.

HeaderLetters 使用此类收集:

    private static class ExcelHeaderHelper
    {
        public static string[] GetHeaderLetters(uint max)
        {
            var result = new List<string>();
            int i = 0;
            var columnPrefix = new Queue<string>();
            string prefix = null;
            int prevRoundNo = 0;
            uint maxPrefix = max / 26;

            while (i < max)
            {
                int roundNo = i / 26;
                if (prevRoundNo < roundNo)
                {
                    prefix = columnPrefix.Dequeue();
                    prevRoundNo = roundNo;
                }
                string item = prefix + ((char)(65 + (i % 26))).ToString(CultureInfo.InvariantCulture);
                if (i <= maxPrefix)
                {
                    columnPrefix.Enqueue(item);
                }
                result.Add(item);
                i++;
            }
            return result.ToArray();
        }
    }

辅助方法是:

    private static IEnumerable<List<string>> GetCellValues(IEnumerable<Row> rows, int columnCount, SpreadsheetDocument document)
    {
        var result = new List<List<string>>();
        foreach (var row in rows)
        {
            List<string> cellValues = new List<string>();
            var actualCells = row.Elements<Cell>().ToArray();

            int j = 0;
            for (int i = 0; i < columnCount; i++)
            {
                if (actualCells.Count() <= j || !actualCells[j].CellReference.ToString().StartsWith(HeaderLetters[i]))
                {
                    cellValues.Add(null);
                }
                else
                {
                    cellValues.Add(GetCellValue(actualCells[j], document));
                    j++;
                }
            }
            result.Add(cellValues);
        }
        return result;
    }


private static string GetCellValue(Cell cell, SpreadsheetDocument document)
{
    bool sstIndexedcell = GetCellType(cell);
    return sstIndexedcell
        ? GetSharedStringItemById(document.WorkbookPart, Convert.ToInt32(cell.InnerText))
        : cell.InnerText;
}

private static bool GetCellType(Cell cell)
{
    return cell.DataType != null && cell.DataType == CellValues.SharedString;
}

private static string GetSharedStringItemById(WorkbookPart workbookPart, int id)
{
    return workbookPart.SharedStringTablePart.SharedStringTable.Elements<SharedStringItem>().ElementAt(id).InnerText;
}

该解决方案处理共享单元格项目(SST 索引单元格)。

于 2012-10-24T13:18:33.933 回答
2

字母代码是 base 26 编码,因此应该可以将其转换为偏移量。

// Converts letter code (i.e. AA) to an offset
public int offset( string code)
{
    var offset = 0;
    var byte_array = Encoding.ASCII.GetBytes( code ).Reverse().ToArray();
    for( var i = 0; i < byte_array.Length; i++ )
    {
        offset += (byte_array[i] - 65 + 1) * Convert.ToInt32(Math.Pow(26.0, Convert.ToDouble(i)));
    }
    return offset - 1;
}
于 2012-11-08T00:50:54.377 回答
2

都是很好的例子。这是我正在使用的一个,因为我需要跟踪所有行、单元格、值和标题以进行关联和分析。

ReadSpreadsheet 方法打开一个 xlxs 文件并遍历每个工作表、行和列。由于这些值存储在引用的字符串表中,因此我还明确地使用每个工作表。还使用了其他类:DSFunction 和 StaticVariables。后者保存经常使用的参数值,例如引用的 'quotdouble' ( quotdouble = "\u0022"; ) 和 'crlf' (crlf = "\u000D" + "\u000A"; )。

下面包含了相关的 DSFunction 方法 GetIntColIndexForLetter。它为与字母名称(例如(A、B、AA、ADE 等))对应的列索引返回一个整数值。这与参数“ncellcolref”一起使用,以确定是否已跳过任何列,并为每个缺失的列输入空字符串值。

在临时存储在 List 对象中之前,我还会对值进行一些清理(使用 Replace 方法)。

随后,我使用列名的哈希表(字典)在不同的工作表中提取值,将它们关联起来,创建标准化值,然后创建在我们的产品中使用的对象,然后将其存储为 XML 文件。这些都没有显示,但这就是使用这种方法的原因。

    public static class DSFunction {

    /// <summary>
    /// Creates an integer value for a column letter name starting at 1 for 'a'
    /// </summary>
    /// <param name="lettstr">Column name as letters</param>
    /// <returns>int value</returns>
    public static int GetIntColIndexForLetter(string lettstr) {
        string txt = "", txt1="";
        int n1, result = 0, nbeg=-1, nitem=0;
        try {
            nbeg = (int)("a".ToCharArray()[0]) - 1; //1 based
            txt = lettstr;
            if (txt != "") txt = txt.ToLower().Trim();
            while (txt != "") {
                if (txt.Length > 1) {
                    txt1 = txt.Substring(0, 1);
                    txt = txt.Substring(1);
                }
                else {
                    txt1 = txt;
                    txt = "";
                }
                if (!DSFunction.IsNumberString(txt1, "real")) {
                    nitem++;
                    n1 = (int)(txt1.ToCharArray()[0]) - nbeg;
                    result += n1 + (nitem - 1) * 26;
                }
                else {
                    break;
                }
            }
        }
        catch (Exception ex) {
            txt = ex.Message;
        }
        return result;
    }


}


    public static class Extractor {

    public static string ReadSpreadsheet(string fileUri) {
        string msg = "", txt = "", txt1 = "";
        int i, n1, n2, nrow = -1, ncell = -1, ncellcolref = -1;
        Boolean haveheader = true;
        Dictionary<string, int> hashcolnames = new Dictionary<string, int>();
        List<string> colvalues = new List<string>();
        try {
            if (!File.Exists(fileUri)) { throw new Exception("file does not exist"); }
            using (SpreadsheetDocument ssdoc = SpreadsheetDocument.Open(fileUri, true)) {
                var stringTable = ssdoc.WorkbookPart.GetPartsOfType<SharedStringTablePart>().FirstOrDefault();
                foreach (Sheet sht in ssdoc.WorkbookPart.Workbook.Descendants<Sheet>()) {
                    nrow = 0;
                    foreach (Row ssrow in ((WorksheetPart)(ssdoc.WorkbookPart.GetPartById(sht.Id))).Worksheet.Descendants<Row>()) {
                        ncell = 0;
                        ncellcolref = 0;
                        nrow++;
                        colvalues.Clear();
                        foreach (Cell sscell in ssrow.Elements<Cell>()) {
                            ncell++;
                            n1 = DSFunction.GetIntColIndexForLetter(sscell.CellReference);
                            for (i = 0; i < (n1 - ncellcolref - 1); i++) {
                                if (nrow == 1 && haveheader) {
                                    txt1 = "-missing" + (ncellcolref + 1 + i).ToString() + "-";
                                    if (!hashcolnames.TryGetValue(txt1, out n2)) {
                                        hashcolnames.Add(txt1, ncell - 1);
                                    }
                                }
                                else {
                                    colvalues.Add("");
                                }
                            }
                            ncellcolref = n1;
                            if (sscell.DataType != null) {
                                if (sscell.DataType.Value == CellValues.SharedString && stringTable != null) {
                                    txt = stringTable.SharedStringTable.ElementAt(int.Parse(sscell.InnerText)).InnerText;
                                }
                                else if (sscell.DataType.Value == CellValues.String) {
                                    txt = sscell.InnerText;
                                }
                                else txt = sscell.InnerText.ToString();
                            }
                            else txt = sscell.InnerText;
                            if (txt != "") txt1 = txt.ToLower().Trim(); else txt1 = "";
                            if (nrow == 1 && haveheader) {
                                txt1 = txt1.Replace(" ", "");
                                if (txt1 == "table/viewname") txt1 = "tablename";
                                else if (txt1 == "schemaownername") txt1 = "schemaowner";
                                else if (txt1 == "subjectareaname") txt1 = "subjectarea";
                                else if (txt1.StartsWith("column")) {
                                    txt1 = txt1.Substring("column".Length);
                                }
                                if (!hashcolnames.TryGetValue(txt1, out n1)) {
                                    hashcolnames.Add(txt1, ncell - 1);
                                }
                            }
                            else {
                                txt = txt.Replace(((char)8220).ToString(), "'");  //special "
                                txt = txt.Replace(((char)8221).ToString(), "'"); //special "
                                txt = txt.Replace(StaticVariables.quotdouble, "'");
                                txt = txt.Replace(StaticVariables.crlf, " ");
                                txt = txt.Replace("  ", " ");
                                txt = txt.Replace("<", "");
                                txt = txt.Replace(">", "");
                                colvalues.Add(txt);
                            }
                        }
                    }
                }
            }
        }
        catch (Exception ex) {
            msg = "notok:" + ex.Message;
        }
        return msg;
    }





}
于 2012-09-10T00:09:45.643 回答
1

您可以使用此函数从传递标题索引的行中提取单元格:

public static Cell GetCellFromRow(Row r ,int headerIdx) {
        string cellname = GetNthColumnName(headerIdx) + r.RowIndex.ToString();
        IEnumerable<Cell> cells = r.Elements<Cell>().Where(x=> x.CellReference == cellname);
        if (cells.Count() > 0)
        {
            return cells.First();
        }
        else {
            return null;
        }
}
public static string GetNthColumnName(int n)
    {
        string name = "";
        while (n > 0)
        {
            n--;
            name = (char)('A' + n % 26) + name;
            n /= 26;
        }
        return name;
    }
于 2013-01-22T10:40:14.893 回答
1

好的,我不是这方面的专家,但其他答案对我来说似乎有点过头了,所以这是我的解决方案:

// Loop through each row in the spreadsheet, skipping the header row
foreach (var row in sheetData.Elements<Row>().Skip(1))
{
    var i = 0;
    string[] letters = new string[15] {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O" };

    List<String> cellsList = new List<string>();
    foreach (var cell in row.Elements<Cell>().ToArray())
    {
        while (cell.CellReference.ToString()[0] != Convert.ToChar(letters[i]))
        {//accounts for multiple consecutive blank cells
            cellsList.Add("");
            i++;
        }
        cellsList.Add(cell.CellValue.Text);
        i++;
    }

    string[] cells = cellsList.ToArray();

    foreach(var cell in cellsList)
    {
        //display contents of cell, depending on the datatype you may need to call each of the cells manually
    }
}

希望有人觉得这很有用!

于 2012-08-29T10:12:44.217 回答
1

很抱歉发布这个问题的另一个答案,这是我使用的代码。

如果工作表顶部有空白行,我会遇到 OpenXML 无法正常工作的问题。它有时只会返回一个包含 0 行和 0 列的 DataTable。下面的代码解决了这个问题,以及所有其他工作表。

这是您如何调用我的代码的方式。只需传入文件名和要读入的工作表的名称:

DataTable dt = OpenXMLHelper.ExcelWorksheetToDataTable("C:\\SQL Server\\SomeExcelFile.xlsx", "Mikes Worksheet");

这是代码本身:

    public class OpenXMLHelper
    {
        //  A helper function to open an Excel file using OpenXML, and return a DataTable containing all the data from one
        //  of the worksheets.
        //
        //  We've had lots of problems reading in Excel data using OLEDB (eg the ACE drivers no longer being present on new servers,
        //  OLEDB not working due to security issues, and blatantly ignoring blank rows at the top of worksheets), so this is a more 
        //  stable method of reading in the data.
        //
        public static DataTable ExcelWorksheetToDataTable(string pathFilename, string worksheetName)
        {
            DataTable dt = new DataTable(worksheetName);

            using (SpreadsheetDocument document = SpreadsheetDocument.Open(pathFilename, false))
            {
                // Find the sheet with the supplied name, and then use that 
                // Sheet object to retrieve a reference to the first worksheet.
                Sheet theSheet = document.WorkbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == worksheetName).FirstOrDefault();
                if (theSheet == null)
                    throw new Exception("Couldn't find the worksheet: " + worksheetName);

                // Retrieve a reference to the worksheet part.
                WorksheetPart wsPart = (WorksheetPart)(document.WorkbookPart.GetPartById(theSheet.Id));
                Worksheet workSheet = wsPart.Worksheet;

                string dimensions = workSheet.SheetDimension.Reference.InnerText;       //  Get the dimensions of this worksheet, eg "B2:F4"

                int numOfColumns = 0;
                int numOfRows = 0;
                CalculateDataTableSize(dimensions, ref numOfColumns, ref numOfRows);
                System.Diagnostics.Trace.WriteLine(string.Format("The worksheet \"{0}\" has dimensions \"{1}\", so we need a DataTable of size {2}x{3}.", worksheetName, dimensions, numOfColumns, numOfRows));

                SheetData sheetData = workSheet.GetFirstChild<SheetData>();
                IEnumerable<Row> rows = sheetData.Descendants<Row>();

                string[,] cellValues = new string[numOfColumns, numOfRows];

                int colInx = 0;
                int rowInx = 0;
                string value = "";
                SharedStringTablePart stringTablePart = document.WorkbookPart.SharedStringTablePart;

                //  Iterate through each row of OpenXML data, and store each cell's value in the appropriate slot in our [,] string array.
                foreach (Row row in rows)
                {
                    for (int i = 0; i < row.Descendants<Cell>().Count(); i++)
                    {
                        //  *DON'T* assume there's going to be one XML element for each column in each row...
                        Cell cell = row.Descendants<Cell>().ElementAt(i);
                        if (cell.CellValue == null || cell.CellReference == null)
                            continue;                       //  eg when an Excel cell contains a blank string

                        //  Convert this Excel cell's CellAddress into a 0-based offset into our array (eg "G13" -> [6, 12])
                        colInx = GetColumnIndexByName(cell.CellReference);             //  eg "C" -> 2  (0-based)
                        rowInx = GetRowIndexFromCellAddress(cell.CellReference)-1;     //  Needs to be 0-based

                        //  Fetch the value in this cell
                        value = cell.CellValue.InnerXml;
                        if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
                        {
                            value = stringTablePart.SharedStringTable.ChildElements[Int32.Parse(value)].InnerText;
                        }

                        cellValues[colInx, rowInx] = value;
                    }
                }

                //  Copy the array of strings into a DataTable.
                //  We don't (currently) make any attempt to work out which columns should be numeric, rather than string.
                for (int col = 0; col < numOfColumns; col++)
                    dt.Columns.Add("Column_" + col.ToString());

                for (int row = 0; row < numOfRows; row++)
                {
                    DataRow dataRow = dt.NewRow();
                    for (int col = 0; col < numOfColumns; col++)
                    {
                        dataRow.SetField(col, cellValues[col, row]);
                    }
                    dt.Rows.Add(dataRow);
                }

#if DEBUG
                //  Write out the contents of our DataTable to the Output window (for debugging)
                string str = "";
                for (rowInx = 0; rowInx < maxNumOfRows; rowInx++)
                {
                    for (colInx = 0; colInx < maxNumOfColumns; colInx++)
                    {
                        object val = dt.Rows[rowInx].ItemArray[colInx];
                        str += (val == null) ? "" : val.ToString();
                        str += "\t";
                    }
                    str += "\n";
                }
                System.Diagnostics.Trace.WriteLine(str);
#endif
                return dt;
            }
        }

        private static void CalculateDataTableSize(string dimensions, ref int numOfColumns, ref int numOfRows)
        {
            //  How many columns & rows of data does this Worksheet contain ?  
            //  We'll read in the Dimensions string from the Excel file, and calculate the size based on that.
            //      eg "B1:F4" -> we'll need 6 columns and 4 rows.
            //
            //  (We deliberately ignore the top-left cell address, and just use the bottom-right cell address.)
            try
            {
                string[] parts = dimensions.Split(':');     // eg "B1:F4" 
                if (parts.Length != 2)
                    throw new Exception("Couldn't find exactly *two* CellAddresses in the dimension");

                numOfColumns = 1 + GetColumnIndexByName(parts[1]);     //  A=1, B=2, C=3  (1-based value), so F4 would return 6 columns
                numOfRows = GetRowIndexFromCellAddress(parts[1]);
            }
            catch
            {
                throw new Exception("Could not calculate maximum DataTable size from the worksheet dimension: " + dimensions);
            }
        }

        public static int GetRowIndexFromCellAddress(string cellAddress)
        {
            //  Convert an Excel CellReference column into a 1-based row index
            //  eg "D42"  ->  42
            //     "F123" ->  123
            string rowNumber = System.Text.RegularExpressions.Regex.Replace(cellAddress, "[^0-9 _]", "");
            return int.Parse(rowNumber);
        }

        public static int GetColumnIndexByName(string cellAddress)
        {
            //  Convert an Excel CellReference column into a 0-based column index
            //  eg "D42" ->  3
            //     "F123" -> 5
            var columnName = System.Text.RegularExpressions.Regex.Replace(cellAddress, "[^A-Z_]", "");
            int number = 0, pow = 1;
            for (int i = columnName.Length - 1; i >= 0; i--)
            {
                number += (columnName[i] - 'A' + 1) * pow;
                pow *= 26;
            }
            return number - 1;
        }
    }
于 2017-05-08T10:00:01.493 回答
0

我无法抗拒优化 Amurra 答案中的子例程,以消除对正则表达式的需求。

实际上不需要第一个函数,因为第二个函数可以接受单元格引用(C3)或列名(C)(但仍然是一个很好的辅助函数)。索引也是基于 1 的(只是因为我们的实现使用基于 1 的行以在视觉上与 Excel 匹配)。

    /// <summary>
    /// Given a cell name, return the cell column name.
    /// </summary>
    /// <param name="cellReference">Address of the cell (ie. B2)</param>
    /// <returns>Column Name (ie. B)</returns>
    /// <exception cref="ArgumentOutOfRangeException">cellReference</exception>
    public static string GetColumnName(string cellReference)
    {
        // Advance from L to R until a number, then return 0 through previous position
        //
        for (int lastCharPos = 0; lastCharPos <= 3; lastCharPos++)
            if (Char.IsNumber(cellReference[lastCharPos]))
                return cellReference.Substring(0, lastCharPos);

        throw new ArgumentOutOfRangeException("cellReference");
    }

    /// <summary>
    /// Return one-based column index given a cell name or column name
    /// </summary>
    /// <param name="columnNameOrCellReference">Column Name (ie. A, AB3, or AB44)</param>
    /// <returns>One based index if the conversion was successful; otherwise null</returns>
    public static int GetColumnIndexFromName(string columnNameOrCellReference)
    {
        int columnIndex = 0;            
        int factor = 1;
        for (int pos = columnNameOrCellReference.Length - 1; pos >= 0; pos--)   // R to L
        {
            if (Char.IsLetter(columnNameOrCellReference[pos]))  // for letters (columnName)
            {
                columnIndex += factor * ((columnNameOrCellReference[pos] - 'A') + 1);
                factor *= 26;
            }
        }
        return columnIndex;
    }
于 2012-10-31T23:17:40.257 回答
0

要读取空白单元格,我使用在行读取器外部分配的名为“CN”的变量,在 while 循环中,我正在检查列索引是否大于我的变量,因为它在每个单元格读取后递增。如果这不匹配,我将用我想要的值填充我的列。这是我用来将空白单元格赶上我尊重的列值的技巧。这是代码:

public static DataTable ReadIntoDatatableFromExcel(string newFilePath)
        {
            /*Creating a table with 20 columns*/
            var dt = CreateProviderRvenueSharingTable();

            try
            {
                /*using stream so that if excel file is in another process then it can read without error*/
                using (Stream stream = new FileStream(newFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                {
                    using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(stream, false))
                    {
                        var workbookPart = spreadsheetDocument.WorkbookPart;
                        var workbook = workbookPart.Workbook;

                        /*get only unhide tabs*/
                        var sheets = workbook.Descendants<Sheet>().Where(e => e.State == null);

                        foreach (var sheet in sheets)
                        {
                            var worksheetPart = (WorksheetPart)workbookPart.GetPartById(sheet.Id);

                            /*Remove empty sheets*/
                            List<Row> rows = worksheetPart.Worksheet.Elements<SheetData>().First().Elements<Row>()
                                .Where(r => r.InnerText != string.Empty).ToList();

                            if (rows.Count > 1)
                            {
                                OpenXmlReader reader = OpenXmlReader.Create(worksheetPart);

                                int i = 0;
                                int BTR = 0;/*Break the reader while empty rows are found*/

                                while (reader.Read())
                                {
                                    if (reader.ElementType == typeof(Row))
                                    {
                                        /*ignoring first row with headers and check if data is there after header*/
                                        if (i < 2)
                                        {
                                            i++;
                                            continue;
                                        }

                                        reader.ReadFirstChild();

                                        DataRow row = dt.NewRow();

                                        int CN = 0;

                                        if (reader.ElementType == typeof(Cell))
                                        {
                                            do
                                            {
                                                Cell c = (Cell)reader.LoadCurrentElement();

                                                /*reader skipping blank cells so data is getting worng in datatable's rows according to header*/
                                                if (CN != 0)
                                                {
                                                    int cellColumnIndex =
                                                        ExcelHelper.GetColumnIndexFromName(
                                                            ExcelHelper.GetColumnName(c.CellReference));

                                                    if (cellColumnIndex < 20 && CN < cellColumnIndex - 1)
                                                    {
                                                        do
                                                        {
                                                            row[CN] = string.Empty;
                                                            CN++;
                                                        } while (CN < cellColumnIndex - 1);
                                                    }
                                                }

                                                /*stopping execution if first cell does not have any value which means empty row*/
                                                if (CN == 0 && c.DataType == null && c.CellValue == null)
                                                {
                                                    BTR++;
                                                    break;
                                                }

                                                string cellValue = GetCellValue(c, workbookPart);
                                                row[CN] = cellValue;
                                                CN++;

                                                /*if any text exists after T column (index 20) then skip the reader*/
                                                if (CN == 20)
                                                {
                                                    break;
                                                }
                                            } while (reader.ReadNextSibling());
                                        }

                                        /*reader skipping blank cells so fill the array upto 19 index*/
                                        while (CN != 0 && CN < 20)
                                        {
                                            row[CN] = string.Empty;
                                            CN++;
                                        }

                                        if (CN == 20)
                                        {
                                            dt.Rows.Add(row);
                                        }
                                    }
                                    /*escaping empty rows below data filled rows after checking 5 times */
                                    if (BTR > 5)
                                        break;
                                }
                                reader.Close();
                            }                            
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return dt;
        }

  private static string GetCellValue(Cell c, WorkbookPart workbookPart)
        {
            string cellValue = string.Empty;
            if (c.DataType != null && c.DataType == CellValues.SharedString)
            {
                SharedStringItem ssi =
                    workbookPart.SharedStringTablePart.SharedStringTable
                        .Elements<SharedStringItem>()
                        .ElementAt(int.Parse(c.CellValue.InnerText));
                if (ssi.Text != null)
                {
                    cellValue = ssi.Text.Text;
                }
            }
            else
            {
                if (c.CellValue != null)
                {
                    cellValue = c.CellValue.InnerText;
                }
            }
            return cellValue;
        }

public static int GetColumnIndexFromName(string columnNameOrCellReference)
        {
            int columnIndex = 0;
            int factor = 1;
            for (int pos = columnNameOrCellReference.Length - 1; pos >= 0; pos--)   // R to L
            {
                if (Char.IsLetter(columnNameOrCellReference[pos]))  // for letters (columnName)
                {
                    columnIndex += factor * ((columnNameOrCellReference[pos] - 'A') + 1);
                    factor *= 26;
                }
            }
            return columnIndex;
        }

        public static string GetColumnName(string cellReference)
        {
            /* Advance from L to R until a number, then return 0 through previous position*/
            for (int lastCharPos = 0; lastCharPos <= 3; lastCharPos++)
                if (Char.IsNumber(cellReference[lastCharPos]))
                    return cellReference.Substring(0, lastCharPos);

            throw new ArgumentOutOfRangeException("cellReference");
        }

代码适用于:

  1. 此代码读取空白单元格
  2. 阅读完成后跳过空行。
  3. 按升序从第一个开始阅读工作表
  4. 如果另一个进程正在使用 excel 文件,OpenXML 仍会读取该文件。
于 2017-03-17T08:26:08.600 回答
0

添加了另一个实现,这次是预先知道列数:

        /// <summary>
        /// Gets a list cells that are padded with empty cells where necessary.
        /// </summary>
        /// <param name="numberOfColumns">The number of columns expected.</param>
        /// <param name="cells">The cells.</param>
        /// <returns>List of padded cells</returns>
        private static IList<Cell> GetPaddedCells(int numberOfColumns, IList<Cell> cells)
        {
            // Only perform the padding operation if existing column count is less than required
            if (cells.Count < numberOfColumns - 1)
            {
                IList<Cell> padded = new List<Cell>();
                int cellIndex = 0;

                for (int paddedIndex = 0; paddedIndex < numberOfColumns; paddedIndex++)
                {
                    if (cellIndex < cells.Count)
                    {
                        // Grab column reference (ignore row) <seealso cref="https://stackoverflow.com/a/7316298/674776"/>
                        string columnReference = new string(cells[cellIndex].CellReference.ToString().Where(char.IsLetter).ToArray());

                        // Convert reference to index <seealso cref="https://stackoverflow.com/a/848552/674776"/>
                        int indexOfReference = columnReference.ToUpper().Aggregate(0, (column, letter) => (26 * column) + letter - 'A' + 1) - 1;

                        // Add padding cells where current cell index is less than required
                        while (indexOfReference > paddedIndex)
                        {
                            padded.Add(new Cell());
                            paddedIndex++;
                        }

                        padded.Add(cells[cellIndex++]);
                    }
                    else
                    {
                        // Add padding cells when passed existing cells
                        padded.Add(new Cell());
                    }
                }

                return padded;
            }
            else
            {
                return cells;
            }
        }

调用使用:

IList<Cell> cells = GetPaddedCells(38, row.Descendants<Cell>().ToList());

其中 38 是所需的列数。

于 2017-09-04T14:19:34.427 回答
0

这是我的解决方案。我发现当缺少字段位于行的末尾时,上述方法似乎效果不佳。

假设 Excel 工作表中的第一行包含所有列(通过标题),然后获取每行预期的列数(行 == 1)。然后遍历数据行(行 > 1)。处理缺失单元格的关键在于方法 getRowCells,其中传入了已知数量的列单元格以及要处理的当前行。

int columnCount = worksheetPart.Worksheet.Descendants<Row>().Where(r => r.RowIndex == 1).FirstOrDefault().Descendants<Cell>().Count();

IEnumerable<Row> rows = worksheetPart.Worksheet.Descendants<Row>().Where(r => r.RowIndex > 1);

List<List<string>> docData = new List<List<string>>();

foreach (Row row in rows)
{
    List<Cell> cells = getRowCells(columnCount, row);

    List<string> rowData = new List<string>();

    foreach (Cell cell in cells)
    {
        rowData.Add(getCellValue(workbookPart, cell));
    }

    docData.Add(rowData);
}

方法 getRowCells 的当前限制是只能支持少于 26 列的工作表(行)。基于已知列数的循环用于查找缺失的列(单元格)。如果找到,则将新的单元格值插入到单元格集合中,新单元格的默认值为“”而不是“空”。然后返回修改后的 Cell 集合。

private static List<Cell> getRowCells(int columnCount, Row row)
{
    const string COLUMN_LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    if (columnCount > COLUMN_LETTERS.Length)
    {
       throw new ArgumentException(string.Format("Invalid columnCount ({0}).  Cannot be greater than {1}",
                columnCount, COLUMN_LETTERS.Length));
    }

    List<Cell> cells = row.Descendants<Cell>().ToList();

    for (int i = 0; i < columnCount; i++)
    {
       if (i < cells.Count)
       {
           string cellColumnReference = cells.ElementAt(i).CellReference.ToString();
            if (cellColumnReference[0] != COLUMN_LETTERS[i])
            {
                cells.Insert(i, new Cell() { CellValue = new CellValue("") });             }
        }
        else
        {
            cells.Insert(i, new Cell() { CellValue = new CellValue("") });
        }
    }

    return cells;
}

private static string getCellValue(WorkbookPart workbookPart, Cell cell)
{
    SharedStringTablePart stringTablePart = workbookPart.SharedStringTablePart;
    string value = (cell.CellValue != null) ? cell.CellValue.InnerXml : string.Empty;

    if ((cell.DataType != null) && (cell.DataType.Value == CellValues.SharedString))
    {
        return stringTablePart.SharedStringTable.ChildElements[Int32.Parse(value)].InnerText;
    }
    else
    {
        return value;
    }
}      
于 2015-11-03T21:04:02.977 回答
0

它使用以下代码运行成功:

            string filePath = "test.xlsx"//your file path 

            //Open the Excel file using ClosedXML.
            using (XLWorkbook workBook = new XLWorkbook(filePath))
            {
                //Read the first Sheet from Excel file.
                IXLWorksheet workSheet = workBook.Worksheet(1);

                //Create a new DataTable.
                DataTable dt = new DataTable();

                //Loop through the Worksheet rows.
                bool firstRow = true;
                foreach (IXLRow row in workSheet.Rows())
                {
                    //Use the first row to add columns to DataTable.
                    if (firstRow)
                    {
                        foreach (IXLCell cell in row.Cells())
                        {
                            dt.Columns.Add(cell.Value.ToString());
                        }
                        firstRow = false;
                    }
                    else
                    {

                        //Add rows to DataTable.
                        dt.Rows.Add();
                        int i = 0;
                        //for (IXLCell cell in row.Cells())
                        for (int j = 1; j <= dt.Columns.Count; j++)
                        {
                            if (string.IsNullOrEmpty(row.Cell(j).Value.ToString()))
                                dt.Rows[dt.Rows.Count - 1][i] = "";
                            else
                                dt.Rows[dt.Rows.Count - 1][i] = 
                            row.Cell(j).Value.ToString();
                            i++;
                        }
                    }
                }
            }
于 2020-04-13T01:14:52.247 回答