Assembly: mscorlib (in mscorlib.dll)
IsComObject returns true if the class type of the instance is attributed with System.Runtime.InteropServices.ComImportAttribute or if it derives directly or indirectly from a class attributed with ComImportAttribute. The Type Library Importer (Tlbimp.exe) applies this attribute for you when it imports a type library.
Two other methods also determine whether a specified object represents a COM object, but the requirements for returning true differ from this method's requirements. Type.IsImport returns true if the class (or interface) is attributed with ComImportAttribute directly; it does not return true for derived types. RegistrationServices.TypeRepresentsComType returns true if the type is attributed with ComImportAttribute or derives from a type with the same GUID.
This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.