Retrieves the value of an environment variable from the current process.
Syntax
Parameters
- variable
Returns
The value of the environment variable specified by variable, or null if the environment variable is not found.
Exceptions
Type Reason ArgumentNullException variable is a null reference. System.Security.SecurityException The caller does not have the required permission.
Remarks
Environment variable names are not case-sensitive.
To retrieve all environment variables along with their values, call the Environment.GetEnvironmentVariables method.
Permissions
| Type | Reason |
|---|---|
| System.Security.Permissions.EnvironmentPermission | Requires permission to read environment variables. See System.Security.Permissions.EnvironmentPermissionAccess.Read. |
Requirements
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0