C#处理固定宽度文件

时间:2012-09-22 11:11:29

标签: c# file width fixed

我有一组固定宽度的文件,其中包含不同数量的列和字段大小。

文件顶部以如下行开头:

AAAAABBCCCCCCCCCCDDD等

字符的变化表示一个字段的结束和另一个字段的开头。我猜这可以用某人来解决字段大小与代码的关系,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写代码。

非常感谢任何帮助:)


/编辑:

我实施了Cuong的解决方案,尽管在我的家用电脑上测试效果很好,但由于我们的工作电脑有Windows XP,我不得不用c#v4进行编译。

无论如何,在阅读输入文件时,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
----------------------------------------

2 个答案:

答案 0 :(得分:1)

根据此TextFieldParser使用课程how-to for Visual Basic

你需要告诉它字段的宽度。鉴于你的第一线,这很容易。

答案 1 :(得分:1)

下面的例子如何写入csv文件(excel类型),主要的一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);