What determines the return value of Path.GetTempPath()?

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(Using Reflector) Path.GetTempPath() ultimately calls the Win32 function GetTempPath (from kernel32.dll). The MDSN docs for this state:

The GetTempPath function checks for the existence of environment variables in the following order and uses the first path found:

  • The path specified by the TMP environment variable.
  • The path specified by the TEMP environment variable.
  • The path specified by the USERPROFILE environment variable.
  • The Windows directory.

Note that they also state that it doesn’t check whether or not the path actually exists or can be written to, so you may end up trying to write your log files to a path that doesn’t exist, or one that you cannot access.

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