0001 2019/04/01 Y-werqwerqwerwe 0002 2019/04/02 N-vvvad 0003 2019/04/02 Y-sfasf 0004 2019/04/02 Y-12 0005 2019/04/03 Y-23faas 0006 2019/04/03 N-12414 0007 2019/04/03 Y-x 以上類似的文本內容

在定寬文本文件中，結尾處的字段可以具有可變寬度。 若要指定結尾處的字段具有可變寬度，請將它定義為寬度小于或等于零。

Public Class Form1Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.ClickOpenFileDialog1.Filter = "Text Files(*.TXT)|*.TXT"If OpenFileDialog1.ShowDialog = DialogResult.OK ThenDim fileName As String = OpenFileDialog1.FileNameUsing Reader As New Microsoft.VisualBasic.FileIO.TextFieldParser(fileName)Reader.TextFieldType = Microsoft.VisualBasic.FileIO.FieldType.FixedWidthReader.SetFieldWidths(5, 11, -1)Dim currentRow As String()While Not Reader.EndOfDataTrycurrentRow = Reader.ReadFields()Dim currentField As StringFor Each currentField In currentRowTextBox1.Text &= vbCrLf & currentFieldNextCatch ex As Microsoft.VisualBasic.FileIO.MalformedLineExceptionMsgBox("Line " & ex.Message & "is not valid and will be skipped.")End TryEnd WhileEnd UsingEnd IfEnd Sub End Class

總結

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