How Can I Access Files Locked by Other Processes in VB.NET and C#?

VB.NET and C# Solutions for Accessing Files Locked by Other Processes

Accessing files simultaneously used by multiple processes often results in the dreaded "in-use" exception. This guide provides reliable methods to read and modify files in VB.NET and C# even when they're locked by other applications.

Utilizing FileShare in VB.NET and C#

A straightforward solution involves the FileShare parameter when opening file streams. Setting FileShare.ReadWrite signals the application's willingness to share file access.

VB.NET Example:

<code class="language-vb.net">Dim strContents As String
Dim objReader As StreamReader
objReader = New StreamReader(FullPath, FileShare.ReadWrite)
strContents = objReader.ReadToEnd()
objReader.Close()</code>

C# Example:

<code class="language-csharp">using (var objReader = new StreamReader(FullPath, FileShare.ReadWrite))
{
    var strContents = objReader.ReadToEnd();
}</code>

Alternative Approach: Employing FileStream

The FileStream class offers finer-grained control over file access. This example demonstrates its usage:

<code class="language-csharp">using (var logFileStream = new FileStream("c:\test.txt", FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (var logFileReader = new StreamReader(logFileStream))
{
    while (!logFileReader.EndOfStream)
    {
        string line = logFileReader.ReadLine();
        // Process each line
    }
}</code>

This code opens the file using FileStream, specifying FileMode.Open, FileAccess.Read, and FileShare.ReadWrite. A StreamReader then efficiently reads the file's content.

Source Attribution

The FileStream approach is adapted from: https://www.php.cn/link/c7876d6b0f9d5461fd3e87c0d1e51e12

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