所以开始这是我已经写代码:逐行读取文本行进行字符串操作
Dim MyFile As String = "Path"
Dim str_new As String
Dim str_old As String = File.ReadAllText(MyFile)
Dim sr As New StreamReader(MyFile)
Dim strLines As String() = Strings.Split(sr.ReadToEnd, Environment.NewLine)
Dim Character As Integer = 5 'Line 1 always has 5 characters
For i = 2 To strLines.Length
Dim PreviousLine As String = sr.ReadLine(i - 1)
Dim CurrentLine As String = sr.ReadLine(i)
If CurrentLine.Contains(TextBox1.Text/100) Then
If PreviousLine.Contains("divide") Then
Exit For
End If
End If
Character = Character + CurrentLine.Length
Next
sr.Close()
str_new = Replace(str_old, (TextBox1.Text/100), (TextBox3.Text/100), Character, 1)
Dim objWriter3 As New System.IO.StreamWriter(MyFile, False)
objWriter3.Write(str_new)
objWriter3.Flush()
objWriter3.Close()
我试图想出一个办法来将一个长代码文件到行,然后检查每个为某些字符串行。如果当前行包含字符串,那么我会在上面和/或下面的行上进行额外的检查,以确保这是字符串的正确实例。最后,我想用不同的字符串替换该字符串的实例。
一个例子:文本文件
class
...
0.3
divide <-- Previous Line
0.3 <-- TextBox1.Text is 30
.5
end
- 我想要的代码去过去的0.3
- 一审查找二审
- 检查前行的鸿沟
- 退出循环
- 将0.3的第二个实例替换为某个值
我一直在寻找这一段时间现在和任何帮助将不胜感激! 〜马特
修订:代码
Dim MyFile As String = "Path"
Dim NewFile As String = "Temporary Path"
Dim PreviousLine As String = ""
Dim CurrentLine As String = ""
Using sr As StreamReader = New StreamReader(MyFile)
Using sw As StreamWriter = New StreamWriter(NewFile)
CurrentLine = sr.ReadLine
Do While (Not CurrentLine Is Nothing)
Dim LinetoWrite = CurrentLine
If CurrentLine.Contains(TextBox1.Text) Then
If PreviousLine.Contains("divide") Then
LinetoWrite = Replace(CurrentLine, TextBox1.Text, TextBox3.Text)
End If
End If
sw.WriteLine(LinetoWrite)
PreviousLine = CurrentLine
CurrentLine = sr.ReadLine
Loop
End Using
End Using
My.Computer.FileSystem.CopyFile(NewFile, MyFile, True)
首先使用变量,而不是文本框。 'TextBox1.Text/100'就是不好的; TB包含文本而不是数字。由于您正在使用结果进行比较,因此您应该对结果进行格式化以使其匹配。另外,使用NotePad ++可能会更快。 – Plutonix
什么版本的.Net? –
Plutonix〜我正在编写一个应用程序,需要用户输入当前值和后一个值。我有错误处理,以确保字符串只有数字。 – Matt