Question

您好我正在使用Visual Basic 2008 Express Edition，我的目标是读取一个完整的.txt文件作为模板，用一个新的替换单词的所有ocurances并将这个新的修改后的文本保存在新的.txt中你按下一个命令按钮。有人可以给我一些提示吗？

Answer 1

Dim fileReader As String = My.Computer.FileSystem.ReadAllText("C:\test.txt").Replace("foo", "bar")
My.Computer.FileSystem.WriteAllText("C:\test2.txt", fileReader, False)

因此，您应该使用FileSystem的ReadAllText方法，将路径作为参数传递，并使用Replace方法替换您要替换的内容。对于替换的更高级用法，您可以使用正则表达式。您可以阅读here。

更短的版本：

My.Computer.FileSystem.WriteAllText("C:\test2.txt", My.Computer.FileSystem.ReadAllText("C:\test.txt").Replace("foo", "bar"), False)

Answer 2

我把它从我正在制作的程序中拉出来，只是剪掉了你不需要的垃圾。

Private Sub UPDATECODES_Click(sender As Object, e As EventArgs) Handles UPDATECODES.Click
    Dim NEWCODE As String = NEWCODEBOX.Text
    Dim CC As String = CURRENTCODE.Text
    Dim oldcode As String
    Dim codelines(0 To 1) As String
    Dim olddate As String

    Using r1 As New System.IO.StreamReader(CODEDIR & "d.dat")
        olddate = r1.ReadToEnd
    End Using

    Using r2 As New System.IO.StreamReader(CODEDIR & "oc.dat")
        oldcode = r2.ReadToEnd
    End Using

    If System.IO.File.Exists(CODEDIR & "new code.txt") Then
        System.IO.File.Delete(CODEDIR & "new code.txt")
    End If

    If System.IO.File.Exists(CODEDIR & "CC.DAT") Then
        If IO.File.Exists(CODEDIR & "oc.dat") Then
            IO.File.Delete(CODEDIR & "OC.DAT")
        End If

        My.Computer.FileSystem.RenameFile(CODEDIR & "CC.DAT", "OC.DAT")
        Dim FILESTREAM As System.IO.FileStream
        FILESTREAM = New System.IO.FileStream(CODEDIR & "CC.DAT", System.IO.FileMode.Create)
        FILESTREAM.Close()
    End If

    Using WRITER As New System.IO.StreamWriter(CODEDIR & "CC.DAT")
        WRITER.WriteLine(NEWCODE)
    End Using

    Dim currentlines(0 To 1) As String
    Dim a As Integer
    Dim TextLine(0 To 1) As String
    a = 0

    Using sr As New System.IO.StreamReader(CODEDIR & "internet code.txt")
        While Not sr.EndOfStream
            ReDim codelines(0 To a)
            codelines(a) = sr.ReadLine()
            codelines(a) = codelines(a).Replace(CURRENTCODE.Text, NEWCODE)
            codelines(a) = codelines(a).Replace(olddate, DATEBOX1.Text & " - " & DATEBOX2.Text)
            Dim newfile As String = (CODEDIR & "new code.txt")
            Using sw As New System.IO.StreamWriter(newfile, True)
                sw.WriteLine(codelines(a))
            End Using
            a = a + 1
        End While
    End Using

    Using sw2 As New System.IO.StreamWriter(CODEDIR & "d.dat")
        sw2.WriteLine(date1 & " - " & date2)
    End Using

    System.IO.File.Delete(CODEDIR & "internet code.txt")
    My.Computer.FileSystem.RenameFile(CODEDIR & "new code.txt", "internet code.txt")
    CURRENTCODE.Text = NEWCODE
End Sub

Answer 3

我有一个我编写的小程序，用于重用代码。当我需要创建一个几乎与现有类相同的类或代码文件时，我会使用它。它是一个基本的表单程序，有四个文本框和一个按钮，它使用与接受的答案相同的命令，但字符串不是硬编码的。

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

  Dim source As String = txtSource.Text
  Dim destination As String = txtDestination.Text
  Dim oldText As String = txtOldText.Text
  Dim newText As String = txtNewText.Text

  My.Computer.FileSystem.WriteAllText(destination, My.Computer.FileSystem.ReadAllText(source).Replace(oldText, newText), False)

End Sub

Answer 4

尝试以下示例我希望它有所帮助

 Dim lOpenFile As Long
 Dim sFileText As String
 Dim sFileName As String

sFileName = "C:\test.txt"

 'open the file and read it into a variable
 lOpenFile = FreeFile
 Open sFileName For Input As lOpenFile
 sFileText = Input(LOF(lOpenFile), lOpenFile)
 Close lOpenFile

'change 'John Doe' to 'Mary Brown'
 sFileText = Replace(sFileText, " John Doe ", " Mary Brown ")

 'write it back to the file
 lOpenFile = FreeFile
 Open sFileName For Output As lOpenFile
 Print #lOpenFile, sFileText
 Close lOpenFile

使用Visual Basic查找和替换txt文档中的文本

4 个答案: