CODEWITHSUNDEEP
c#
Ayyappan Subramanian
Ayyappan Subramanian

Reputation: 5366

C# Setting Environment Vairables

I am trying to modify environmental variable using the below code.

Environment.SetEnvironmentVariable("MyEnv", "True");

In the same program in the next line, I am trying to retrive it.

string myEnv=Environment.GetEnvironmentVariable("MyEnv");

But I am getting the old value in the environment variable not the new value. Any pointers to the problem will be helpful. using c# and .Net4.0

Upvotes: 0

Views: 374

Answers (2)

CathalMF
CathalMF

Reputation: 10055

When storing environmental variables like this they are only stored as long as the process is running. If you close your program the variables are gone.

    static void Main(string[] args)
    {
        string MyEnv = string.Empty;

        MyEnv = Environment.GetEnvironmentVariable("MyEnv");
        Console.WriteLine("MyEnv=" + MyEnv);

        MyEnv = "True";
        Environment.SetEnvironmentVariable("MyEnv", MyEnv);
        MyEnv = Environment.GetEnvironmentVariable("MyEnv");
        Console.WriteLine("MyEnv=" + MyEnv);

        MyEnv = "False";
        Environment.SetEnvironmentVariable("MyEnv", MyEnv);
        MyEnv = Environment.GetEnvironmentVariable("MyEnv");
        Console.WriteLine("MyEnv=" + MyEnv);

        Console.ReadLine();
    }

Output:

MyEnv=
MyEnv=True
MyEnv=False

Upvotes: 1

David P
David P

Reputation: 2093

Until your hosting process is restarted, its not going to recognize the new value unless you set the EnvironmentVariableTarget to "Process":

Environment.SetEnvironmentVariable("MyEnv", "True",EnvironmentVariableTarget.Process);
string myEnv=Environment.GetEnvironmentVariable("MyEnv",EnvironmentVariableTarget.Process);

Upvotes: 1

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