Type.GetTypeFromCLSID Method (Guid, String)
Gets the type associated with the specified class identifier (CLSID) from the specified server.
Assembly: mscorlib (in mscorlib.dll)
- Type: System.Guid
The CLSID of the type to get.
- Type: System.String
The server from which to load the type. If the server name is a null reference (Nothing in Visual Basic), this method automatically reverts to the local machine.
Return ValueType: System.Type
System.__ComObject regardless of whether the CLSID is valid.
The GetTypeFromCLSID method supports late-bound access to unmanaged COM objects from .NET Framework apps when you know the COM object's class identifier (CLSID). The class identifier for COM classes is defined in the HKEY_CLASSES_ROOT\CLSID key of the registry. You can retrieve the value of the IsCOMObject property to determine whether the type returned by this method is a COM object.
You can call the GetTypeFromProgID method for late-bound access to COM objects whose programmatic identifier (ProgID) you know.
Instantiating an unmanaged COM object from its CLSID is a two-step process:
Call the Activator.CreateInstance(Type) method to instantiate the COM object.
This method is intended for use when working with COM objects, not with .NET Framework objects. All managed objects, including those that are visible to COM (that is, their ComVisibleAttribute attribute is true) have a GUID that is returned by the GUID property. Although the method returns a Type object that corresponds to the GUID for .NET Framework objects, you can't use that Type object to create a type instance by calling the Activator.CreateInstance method, as the following example shows.
Instead, the GetTypeFromCLSID should only be used to retrieve the GUID of an unmanaged COM object, and the resulting Type object that is passed to the Activator.CreateInstance method must represent an unmanaged COM object.
The following example uses the CLSID of the Microsoft Word Application object to retrieve a COM type that represents the Microsoft Word application from a server named computer17.central.contoso.com. It then instantiates the type by calling the Activator.CreateInstance method, and closes it by calling the Application.Quit method.