Called by the host to register the specified extension manager, validate that all required extensions are present, and to initialize the collection of extensions to be used.
Assembly: System.Activities (in System.Activities.dll)
Extensions are keyed by type, and a host provided extension will always be used if provided. Extensions added through use the runtime type of the object as the type key. Extensions providers added through Add<T>(Func<T>) use the decared type T of the Func<T> as the type key. Extension providers contributed by activities through the various *ActivityMetadata.AddDefaultExtensionProvider methods are dropped if a host extension exists for the declared type or if there is a broader type provided through AddDefaultExtensionProvider (ex. if Func<StreamWriter> is provided and Func<TextWriter> is provided, only Func<StreamWriter> will be kept). If an extension does not exist in the collection that is required by an activity (expressed by calling *ActivityMetadata.RequireExtension) a ValidationException is thrown.
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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.