从文本文件中删除 a 中的每第二行和第三行

Question

我目前正在寻找一种删除 txt 文件中的第 (n) 行和第 (n) 行的方法。 例如每第二行和第五行。 有没有办法用脚本或 C# 来做到这一点？

Answer 1

这段代码是在 VB.NET 中，但我相信这会做你想要的？

    Dim sr As streamreader = Nothing
    Dim sw As StreamWriter = Nothing
    Dim LineString As String = ""
    Dim LineNum As Integer = 0
    Try
        sr = New StreamReader("C:\scratch\input.txt")
        sw = New StreamWriter("c:\scratch\output.txt")
        Do Until sr.EndOfStream
            LineString = sr.ReadLine
            LineNum += 1

            If LineNum Mod 2 = 0 Then
                'don't output 2nd line
            ElseIf LineNum Mod 5 = 0 Then
                'don't output 5th line
            Else
                'write it 
                sw.WriteLine(LineString)
            End If
        Loop
    Catch ex As Exception
        MsgBox("Error - " & ex.Message)
    Finally
        If Not IsNothing(sr) Then sr.Close()
        If Not IsNothing(sw) Then sw.Close()
    End Try