System.Environment.Environment.GetEnvironmentVariables C# (CSharp) Method

		public static IDictionary GetEnvironmentVariables (EnvironmentVariableTarget target)
		{
			IDictionary variables = (IDictionary)new Hashtable ();
			switch (target) {
			case EnvironmentVariableTarget.Process:
				variables = GetEnvironmentVariables ();
				break;
			case EnvironmentVariableTarget.Machine:
				new EnvironmentPermission (PermissionState.Unrestricted).Demand ();
				if (IsRunningOnWindows) {
					using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.LocalMachine.OpenSubKey (@"SYSTEM\CurrentControlSet\Control\Session Manager\Environment")) {
						string[] value_names = env.GetValueNames ();
						foreach (string value_name in value_names)
							variables.Add (value_name, env.GetValue (value_name));
					}
				}
				break;
			case EnvironmentVariableTarget.User:
				new EnvironmentPermission (PermissionState.Unrestricted).Demand ();
				if (IsRunningOnWindows) {
					using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.CurrentUser.OpenSubKey ("Environment")) {
						string[] value_names = env.GetValueNames ();
						foreach (string value_name in value_names)
							variables.Add (value_name, env.GetValue (value_name));
					}
				}
				break;
			default:
				throw new ArgumentException ("target");
			}
			return variables;
		}