Question

I want to dynamically load a dll and construct a MyDllClass object. My code is roughly as follows(unrelevant parts stripped):

MyDllClass.cs

namespace MyDllNameSpace
{
    public class MyDllClass
    {

        private EventCallBack m_DelegateCallBack = null;

        public MyDllClass(EventCallBack eventCallBack)
        {
            m_DelegateCallBack = eventCallBack;
        }

        public MyDllClass()
        {
        }
        ...
    }
}

MyDllCallBackNameSpace.cs

namespace MyDllCallBackNameSpace
{
    public delegate void EventCallBack(string message);
}

I managed to construct the object using the empty constructor but I couldn’t get other constructor working. I get ArgumentException

at System.Reflection.RuntimeConstructorInfo.InternalInvoke()  
at System.Reflection.RuntimeConstructorInfo.Invoke()  
at System.Reflection.ConstructorInfo.Invoke() at MyProgram.InitMyObject()  
at ...

Here is my code:

MyProgram.cs

public void InitMyObject(EventCallBack callBack)
    System.Reflection.Assembly assembly = System.Reflection.Assembly.LoadFrom(DLL_PATH);
    Type type = assembly.GetType(CLASS_NAME);
    ConstructorInfo[] constructors = type.GetConstructors();
    if (type != null)
    {
        // empty constructor, works!!!
        //return constructors[1].Invoke(new object[0]); 
        // This one gives InvalidArgument exception
        return constructors[0].Invoke(new object[] {callBack});
    }
    return null;
}

MyDllCallBackNameSpace.cs file has been added to both projects(the .dll & the .exe project) and references the same physical file on my drive. But I suspect that it is still treated as different. Any ideas why it is not working, or any workarounds?

Answer 1

I managed to fix this buy moving MyDllCallBackNameSpace.cs into another dll. Then I referenced that dll from both projects.