使用 VB.Net 2 读取和写入文本文件中的特定行

Question

I have tried using the solution (given below) for the "Read and Write to specific line in textfile with VB.Net" problem asked 4 years ago

Dim filePath As String = "E:\myFile.txt"
Dim lines() As String = System.IO.File.ReadAllLines(filePath)
If lines.Length > 4 AndAlso lines(4).StartsWith("ORIGIN ") Then
    lines(4) = "ORIGIN ""250"""
    System.IO.File.WriteAllLines(filePath, lines)
End If

But each time I encounter the following error:

The process cannot access the file 'file_path' because it is being used by another process.

Any idea as to why this happens?

Answer 1

Your code works OK for me. System.IO.File.ReadAllLines() is supposed to close the file afterwards.

Maybe something else is preventing write access to the file. (Some application you're using to see if it's working?,) To check that, replace

Dim lines() As String = System.IO.File.ReadAllLines(filePath)

with

Dim lines() As String = {"0","1","2","3","ORIGIN 4", "5"}

and see if it still fails.