How Do I Access and Modify Environment Variables in C#?

Access and modify environment variables in C#

Accessing and modifying environment variables is crucial in various programming scenarios. Here’s how to do it in C#:

Get environment variables:

To get the value of an environment variable, use the System.Environment method of the GetEnvironmentVariable class. For example:

<code class="language-csharp">var value = System.Environment.GetEnvironmentVariable("PATH");</code>

If the specified variable does not exist, this method will return null.

Set environment variables:

To set or modify environment variables, use the SetEnvironmentVariable method:

<code class="language-csharp">System.Environment.SetEnvironmentVariable("MY_NEW_VARIABLE", "SomeValue");</code>

By default, changes only apply to the current process. To change variables for other targets (such as computers or users), specify the desired EnvironmentVariableTarget enumeration as the third argument. For example:

<code class="language-csharp">System.Environment.SetEnvironmentVariable("MY_NEW_VARIABLE", "SomeValue", EnvironmentVariableTarget.Machine);</code>

Note: Variables set for the current process are only available within that process. Modifications to environment variables outside the scope of the process require elevated privileges.

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