May 3, 2021

Get All the Types a COM Object Implements


This article shows how to get all the types a COM object implements.


When you get a COM object in C#, if you know the classes and the interfaces it implements, you can easily cast it to the desired type. But, what if you don't know its type. Or more to the point, you think you know it's type and it doesn't implement that type.

Using the code

The following method will return all the types that a COM object implements. I don't use this in production code, but I do use it occasionally when writing code.


Shrink ▲   Copy Code

/// <summary>
/// Get all implemented types in a COM object. Code based on work at
///          the-type-of-a-com-object-system__comobject-with-visual-c-net/
/// </summary>
/// <param name="comObject">The object we want all types of.</param>
/// <param name="assType">Any type in the COM assembly.</param>
/// <returns>All implemented classes/interfaces.</returns>
public static Type[] GetAllTypes(object comObject, Type assType)

// get the com object and fetch its IUnknown
   IntPtr iunkwn = Marshal.GetIUnknownForObject(comObject);

// enum all the types defined in the interop assembly
   Assembly interopAss = Assembly.GetAssembly(assType);
   Type[] excelTypes = interopAss.GetTypes();

// find all types it implements
   ArrayList implTypes = new ArrayList();
   foreach (Type currType in excelTypes)
// com interop type must be an interface with valid iid
       Guid iid = currType.GUID;
       if (!currType.IsInterface || iid == Guid.Empty)

// query supportability of current interface on object
       IntPtr ipointer;
       Marshal.QueryInterface(iunkwn, ref iid, out ipointer);

       if (ipointer != IntPtr.Zero)


// no implemented type found
   return (Type[])implTypes.ToArray(typeof(Type));

Original post: