[英]Reading Text line by line to make string manipulation
因此,这是我已经编写的代码:
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()
我试图找出一种方法,将长代码文件分成几行,然后检查每一行中的某些字符串。 如果当前行包含字符串,那么我将在行的上方和/或下方进行其他检查,以确保这是字符串的正确实例。 最后,我只想用另一个字符串替换该字符串实例。
一个例子:文本文件
class
...
0.3
divide <-- Previous Line
0.3 <-- TextBox1.Text is 30
.5
end
我已经研究了一段时间了,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)
您正以错误的方式面对问题。 您必须同时设置读取器和写入器,并生成具有所有修改的新文件。 您的代码包含需要改进的各个部分。 在这个答案中,我只是向您展示如何正确使用StreamReader
/ StreamWriter
。 样例代码:
Dim MyFile As String = "input path"
Dim OutputFile As String = "output path"
Dim PreviousLine As String = ""
Dim CurrentLine As String = ""
Using sr As StreamReader = New StreamReader(MyFile)
Using sw As StreamWriter = New StreamWriter(OutputFile)
CurrentLine = sr.ReadLine
Do While (Not CurrentLine Is Nothing)
Dim lineToWrite = CurrentLine
'Perform the analysis you wish by involving the current line, the previous one and as many other (previous) lines as you wish; and store the changes in lineToWrite. You should call a function here to perform this analysis
sw.WriteLine(lineToWrite) 'Writing lineToWrite to the new file
PreviousLine = CurrentLine 'Future previous line
CurrentLine = sr.ReadLine 'Reading the line for the next iteration
Loop
End Using
End Using
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.