c# - 使用 OpenXmlReader

Question

我讨厌求助于 StackOverflow 来做一些如此（看似）基本的事情，但在过去的几个小时里我一直在与 Microsoft 争吵，似乎走到了死胡同。我正在尝试阅读（大型）Excel 2007+ 电子表格，Google 亲切地告诉我，使用 OpenXml SDK 是一个非常受欢迎的选择。所以我试了一下，阅读了一些教程，检查了微软自己的库页面，但从它们中得到的很少。

我正在使用一个只有一列数字和一列字符串的小型测试电子表格 - 稍后将进行大规模测试。我已经尝试了几种类似于我即将发布的实现，但它们都没有读取数据。下面的代码主要取自另一个 StackOverflow 线程，它似乎在那里工作 - 对我来说并非如此。我想我会让你们检查/调试/帮助这个版本，因为它可能比我今天写的任何东西都要少。

static void ReadExcelFileSAX(string fileName)
    {
        using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(fileName, true))
        {
            WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;
            WorksheetPart worksheetPart = workbookPart.WorksheetParts.First();

            OpenXmlPartReader reader = new OpenXmlPartReader(worksheetPart);
            string text;
            string rowNum;
            while (reader.Read())
            {
                if (reader.ElementType == typeof(Row))
                {
                    do
                    {
                        if (reader.HasAttributes)
                        {
                            rowNum = reader.Attributes.First(a => a.LocalName == "r").Value;
                            Console.Write("rowNum: " + rowNum); //we never even get here, I tested it with a breakpoint
                        }

                    } while (reader.ReadNextSibling()); // Skip to the next row
                    Console.ReadKey();
                    break; // We just looped through all the rows so no need to continue reading the worksheet
                }
                if (reader.ElementType == typeof(Cell))
                {

                }

                if (reader.ElementType != typeof(Worksheet)) // Dont' want to skip the contents of the worksheet
                    reader.Skip(); // Skip contents of any node before finding the first row.
            }
            reader.Close();
            Console.WriteLine();
            Console.ReadKey();
        }
    }

而且，在旁注中，有没有什么好的替代方案来使用我错过的 OpenXml SDK？

Answer 1

我认为你WorksheetPart读错了行。

线

workbookPart.WorksheetParts.First();

获取WorksheetPart集合的第一个，它不一定是您在 Microsoft Excel 中看到的第一个工作表。

因此，遍历所有WorksheetParts内容，您应该会在控制台窗口中看到一些输出。

static void ReadExcelFileSAX(string fileName)
{
  using (SpreadsheetDocument spreadsheetDocument = 
                                   SpreadsheetDocument.Open(fileName, true))
  {
    WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;

    // Iterate through all WorksheetParts
    foreach (WorksheetPart worksheetPart in workbookPart.WorksheetParts)
    {          
      OpenXmlPartReader reader = new OpenXmlPartReader(worksheetPart);
      string text;
      string rowNum;
      while (reader.Read())
      {
        if (reader.ElementType == typeof(Row))
        {
          do
          {
            if (reader.HasAttributes)
            {
              rowNum = reader.Attributes.First(a => a.LocalName == "r").Value;
              Console.Write("rowNum: " + rowNum);
            }

          } while (reader.ReadNextSibling()); // Skip to the next row

          break; // We just looped through all the rows so no 
                 // need to continue reading the worksheet
        }

        if (reader.ElementType != typeof(Worksheet))
          reader.Skip(); 
      }
      reader.Close();      
    }
  }  
}

要读取所有单元格值，请使用以下函数（省略所有错误处理细节）：

static void ReadAllCellValues(string fileName)
{
  using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(fileName, false))
  {
    WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;

    foreach(WorksheetPart worksheetPart in workbookPart.WorksheetParts)
    {
      OpenXmlReader reader = OpenXmlReader.Create(worksheetPart);

      while (reader.Read())
      {
        if (reader.ElementType == typeof(Row))
        {
          reader.ReadFirstChild();

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

              string cellValue;

              if (c.DataType != null && c.DataType == CellValues.SharedString)
              {
                SharedStringItem ssi = workbookPart.SharedStringTablePart.SharedStringTable.Elements<SharedStringItem>().ElementAt(int.Parse(c.CellValue.InnerText));

                cellValue = ssi.Text.Text;
              }
              else
              {
                cellValue = c.CellValue.InnerText;
              }

              Console.Out.Write("{0}: {1} ", c.CellReference, cellValue);
            }
          } while (reader.ReadNextSibling());
          Console.Out.WriteLine();
        }            
      }
    }   
  }
}

在上面的代码中，您看到具有数据类型的单元格SharedString必须使用SharedStringTablePart.

Answer 2

要读取空白单元格，我使用在行读取器外部分配的变量，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. 读取完成后跳过空行。3. 以升序从第一个读取工作表 4. 如果 excel 文件正在被另一个进程使用，OpenXML 仍然会读取该文件。