当使用 TextFieldParser 读取固定字段宽度的文本文件(17、90 和 120 个字符的 3 个字段,即 227 个字符)时,一旦我将最后一个文本框留空(TextBox4),就会出现错误。在我看来,这种情况正在发生,因为字段长度比预期的要短。
Using Reader As New Microsoft.VisualBasic.FileIO.
TextFieldParser(OuvrirFichier, Encoding.UTF8)
Reader.TextFieldType =
Microsoft.VisualBasic.FileIO.FieldType.FixedWidth
Reader.SetFieldWidths(227)
Dim currentRow As String()
While Not Reader.EndOfData
Try
currentRow = Reader.ReadFields()
Dim currentField As String
For Each currentField In currentRow
TextBox2.Text = currentField.Substring(0, 17)
TextBox1.Text = currentField.Substring(17, 90)
TextBox4.Text = currentField.Substring(107) ', 120))
Dim node As TreeNode = Me.TreeView1.Nodes(0)
TreeView1.Nodes(0).Nodes.Add(New TreeNode(TextBox1.Text))
ListBox2.Items.Add(TextBox1.Text)
Next
Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
MsgBox("La ligne " & ex.Message &
" n'est pas valide et sera ignorée.")
End Try
End While
End Using
'节省
Dim fileName As String = OuvrirFichier
Dim bt As New article With {
.Title = TextBox2.Text,
.Name = TextBox1.Text,
.Charge = TextBox4.Text
}
Using fs As New FileStream(fileName, FileMode.Append)
Using writer As New StreamWriter(fs, Encoding.UTF8)
If fs.Length > 0 Then writer.WriteLine()
writer.Write($"{bt.Title,-17}{bt.Name,-90}{bt.Charge,-120}")
End Using
End Using