从文本文件vb.net删除一行 [英] Remove a line from text file vb.net

问题描述

我正在使用vb.net Windows窗体应用程序.我想从行列表中删除行.

I'm using vb.net windows form app. I want to remove line from list of lines.

因此，如果该列表中存在文本框中的行，则要从列表中删除该行，并保存文件.

So if the line in textbox exists on that list, to be remove from list, and file to be saved.

我有一个包含数字列表的list.txt文件:

I have a file list.txt with list of numbers :

123-123
321-231
312-132

如果我在文本框内写:321-231，并且如果list.txt包含该行，则将其删除. 所以结果必须是:

If I write in textbox : 321-231 and if list.txt contains that line then remove it. so result need to be :

123-123
321-132

我正在尝试使用此代码:

I was trying with this code :

 Dim lines() As String
  Dim outputlines As New List(Of String)
        Dim searchString As String = Textbox1.Text
         lines = IO.File.ReadAllLines("D:\list.txt")
         For Each line As String In lines
             If line.Contains(searchString) = True Then
                 line = ""  'Remove that line and save text file (here is my problem I think )
                 Exit For
             End If
         Next

推荐答案

在处理字符串时将其放入outputlines列表中，除非它与键入的值匹配，如下所示:

Put each string as you process it in the outputlines list, unless it matches the value typed in, like this:

Dim lines() As String
Dim outputlines As New List(Of String)
Dim searchString As String = Textbox1.Text
lines = IO.File.ReadAllLines("D:\list.txt")

For Each line As String In lines
    If line.Contains(searchString) = False Then
        outputlines.Add(line)
    End If
Next

现在outputlines匹配与用户键入的内容不匹配的每一行，您可以将outputlines列表的内容写入文件.

Now outputlines matches every line that did not match what was typed in by the user and you can write the contents of the outputlines list to file.

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