Process.Start filename using %temp%

Question

For some odd reaseon this code fails:

p.StartInfo.FileName = @\"%temp%\\SSCERuntime_x86-ENU.msi\";

and this code succes:

p.         


        

Answer 1

You can use the Environment.ExpandEnvironmentVariables to expand environment variables within a string, then pass that to the Process class:

p.StartInfo.FileName = Environment.ExpandEnvironmentVariables(@"%temp%\SSCERuntime_x86-ENU.msi");

This has the added benefits of

1. Working for any environment variable (%APPDATA%, %COMMONPROGRAMFILES%, etc), and
2. Working anywhere in the string (e.g. "%temp%\%username%\foo.txt")