Several years ago I tried to find a way of setting (creating) DOS
environment variables in code and then using the values in batch files. I
remember I failed because the variables only existed for the duration of the
process. I had a fresh look at this problem today and was thrilled to see a
3rd argument added to the SetEnvironmentVariable
<http://msdn.microsoft.com/en-us/library/system.environment.setenvironmentva
riable.aspx> method. I wrote a console app with this single line of code:
Environment.SetEnvironmentVariable("Foo", string.Format("{0:HHmmss}",
DateTime.Now), EnvironmentVariableTarget.User);
In a bat file I then called this app followed by a "set f" command. But
sadly the Foo value is not present. I tried setting target to Machine, but
this requires admin privileges to write to HKLM. Even more sadly it does
work either because it seems to write the reg entry but the new value is not
immediately picked up by the batch file.
Does anyone know of a trick to programmatically set environment variables
for use in a bat file?
Greg
