How Do I Manage Environment Variables in C#?

Working with Environment Variables in C#

Accessing and modifying environment variables is a frequent programming need. The System.Environment class in C# provides the tools to handle this efficiently.

Retrieving Environment Variables

Use the GetEnvironmentVariable method to obtain the value of an environment variable:

<code class="language-csharp">string value = System.Environment.GetEnvironmentVariable("variableName", EnvironmentVariableTarget.Process);</code>

The EnvironmentVariableTarget parameter (optional, defaults to Process) defines the variable's scope: Machine, Process, or User.

Modifying Environment Variables

To change the value of an environment variable, employ the SetEnvironmentVariable method:

<code class="language-csharp">System.Environment.SetEnvironmentVariable("variableName", "newValue", EnvironmentVariableTarget.Process);</code>

As before, EnvironmentVariableTarget determines the variable's scope. Remember that changes made with Machine or User scope might require administrator privileges.

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