3

我有一组具有不同列数和字段大小的固定宽度文件。

文件的顶部以如下行开头：

AAAAABBCCCCCCCCCCDDD等

字符的变化表示一个字段的结束和另一个字段的开始。我猜这可以有人用来计算代码的字段大小，然后将相同的值应用于下面的实际数据行。

然后我想将所有读取的数据输出到 XLS 文件甚至 DataGrid 中，但我的问题是我不知道如何编码。

任何帮助将不胜感激 ：）

/编辑：

我实现了 Cuong 的解决方案，虽然在我的家用 PC 上测试效果很好，但我必须用 c# v4 编译它，因为我们的工作 PC 有 Windows XP。

无论如何，在读取输入文件时，我收到以下错误：

************** Exception Text **************
System.ObjectDisposedException: Cannot read from a closed TextReader.
   at System.IO.__Error.ReaderClosed()
   at System.IO.StreamReader.ReadLine()
   at System.IO.File.<InternalReadLines>d__0.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.IO.File.InternalWriteAllLines(TextWriter writer, IEnumerable`1 contents)
   at System.IO.File.WriteAllLines(String path, IEnumerable`1 contents)
   at FixedWidthFiles.Main.buttonProcessFile_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)
    CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
FixedWidthFiles
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/TEMP/FixedWidthFiles.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.1 built by: RTMRel
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.1 built by: RTMRel
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.1 built by: RTMRel
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.1 built by: RTMRel
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
4

3 回答 3

1

根据 Visual Basic 的此操作指南使用类TextFieldParser类型。

您需要告诉它字段的宽度。鉴于您的第一行，这很容易。

于 2012-09-22T11:14:55.783 回答
1

您可以使用TextReader.Read方法。例如：

    string input; // Test string

    // Replace new StringReader with a StreamReader to read a file
    using (TextReader textReader = new StringReader(input))
    {
        // Read first line to get structure
        var groupings = textReader.ReadLine().GroupBy(x => x);

        while (textReader.Peek() != -1)
        {
            // Convert to a string for easier handling than char[]
            List<string> fields = new List<string>();

            // Get the fields on each ling
            foreach (IGrouping<char, char> grouping in groupings)
            {
                char[] field = new char[grouping.Count()];
                textReader.Read(field, 0, field.Length);
                fields.Add(new string(field));
            }

            // Do something with "fields". The name of each field is
            // in grouping.Key at the same index.

            // Move to next line
            textReader.ReadLine();
        }
    }
于 2012-09-22T11:25:42.910 回答
1

下面的例子如何写入csv文件（excel类型），重点是你需要读取第一行并计算宽度：

var lines = File.ReadLines("C:\\input.txt");

var widthList = lines.First().GroupBy(c => c)
                             .Select(g => g.Count())
                             .ToList();

var list = new List<KeyValuePair<int, int>>();

int startIndex = 0;

for (int i = 0; i < widthList.Count(); i++)
{
    var pair = new KeyValuePair<int, int>(startIndex, widthList[i]);
    list.Add(pair);

    startIndex += widthList[i];
}

var csvLines = lines.Select(line => string.Join(",", 
                    list.Select(pair => line.Substring(pair.Key, pair.Value))));

File.WriteAllLines("C:\\test.csv", csvLines);
于 2012-09-23T08:21:37.117 回答