Environment.GetEnvironmentVariable Method (String, EnvironmentVariableTarget)
Retrieves the value of an environment variable from the current process or from the Windows operating system registry key for the current user or local machine.
Assembly: mscorlib (in mscorlib.dll)
static member GetEnvironmentVariable : variable:string * target:EnvironmentVariableTarget -> string
- Type: System.String
The name of an environment variable.
Return ValueType: System.String
The value of the environment variable specified by the variable and target parameters, or a null reference (Nothing in Visual Basic) if the environment variable is not found.
The following example creates environment variables for the Process, User, and Machine targets, checks whether the operating system registry contains the User and Machine environment variables, then deletes the environment variables.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.