How do I get and set Environment variables in C#?

Question

How can I get Environnment variables and if something is missing, set the value?

Answer 1

Use the System.Environment class.

The method System.Environment.GetEnvironmentVariable ()

and

System.Environment.SetEnvironmentVariable()

will do the job for you.

Answer 2

how do I get System.Environment.SetEnvironmentVariable() to work when I'm inside the process and I want to reset the value of the variable for it to be read from outside the process?

Answer 3

This will work for enviroment variable that is machine setting. For Users just change to User instead.

String EnviromentPath = System.Environment.GetEnvironmentVariable("Variable_Name", EnvironmentVariableTarget.Machine);