SerializationException: Type is not resolved for member "..."

Question

I've been trying to dynamically load an assembly to an AppDomain. I need to do it because I want to call a method dynamically, but don't keep the handle to the DLL while my app is running, so that it can be replaced, if needed. But I'm getting this SerializationException exception: Type is not resolved for member "..."

Here's my code:

AppDomain domain = AppDomain.CreateDomain("Temp AppDomain", null, AppDomain.CurrentDomain.SetupInformation);
try {
    object obj = domain.CreateInstanceFromAndUnwrap(dllPath, typeName);
    IMyInterface myObj = (IMyInterface) obj;
    result = myObj.MyMethod(something);
} 
finally {
    AppDomain.Unload(domain);
}

Use Fuslogvw.exe to find out why it can't find the assembly with the type of that member. — Hans Passant, Dec 05 '12 at 18:42

score 35 · Accepted Answer · edited Dec 18 '15 at 16:51

35

Answer: The type had to extend MarshalByRefObject.

edited Dec 18 '15 at 16:51

Luke Puplett

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answered Dec 11 '12 at 15:14

gsb

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SerializationException: Type is not resolved for member "..."

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