Why Does %~dp0 Change Directory in Batch Files When Called from C#?

Analysis of behavioral differences of %~dp0 variable when C# calls batch file

When running the batch file directly, the %~dp0 variable represents the full path of the batch file. However, when calling the batch file from a C# program using quotes, the value of %~dp0 changes after changing directories.

Cause Analysis

This problem stems from the way cmd.exe handles quoted %~0 parameters. When a batch file is started with quotes, the quotes are removed and the batch call is made relative to the current directory. Therefore, when the directory is changed inside the batch file, %~dp0 will follow the relative path change, resulting in different values.

Solution

C# solution:

• Avoid using quotes when starting a batch file: cmd /c batchfile.cmd
• If quotes must be used, include the full path to the batch file in the call.

Batch file-side solution:

Create a subroutine to reliably get the path to a batch file:

<code class="language-batch">@echo off
setlocal enableextensions disabledelayedexpansion

call :getCurrentBatch batch
echo %batch%

exit /b

:getCurrentBatch variableName
set "%~1=%~f0"
goto :eof</code>

This subroutine ensures that no matter how it is called, the full path to the batch file is obtained.

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