c# - Two Types not equal that should be

Question

I'm trying to debug some code that uses reflection to load plugins

Here's the debugging code:

Type a = methodInfo.GetParameters()[0]
    .ParameterType.BaseType;
Type b = typeof(MessageContext);
Debug.WriteLine(a.AssemblyQualifiedName);
Debug.WriteLine(b.AssemblyQualifiedName);
Debug.WriteLine(a.Equals(b));

And here is its output:

OrtzIRC.Common.MessageContext, OrtzIRC.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
OrtzIRC.Common.MessageContext, OrtzIRC.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
False

I don't understand what would make these two types different?

Answer 1

The same class / type loaded by different app domains [.NET] or class loaders [Java] will not compare equal and are not assignable to/from each other directly.

You likely have two copies of the DLL containing that type - one loaded by the main program and one loaded by one of the Assembly.Load*(...) methods?

Try displaying / comparing the properties:
a.Assembly.Equals(b.Assembly)
and
a.Assembly.Location.Equals(b.Assembly.Location)

In general, you only want one copy of each DLL and have it loaded into a single app domain.