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Question

I am trying to embed a third party library into my DLL. The DLL has been referenced and set not to copy local as well as added to the resources. I then do the following to load the DLL at during runtime.

AppDomain.CurrentDomain.AssemblyResolve += (sender, args) =>
    {
        string resourceName = new AssemblyName(args.Name).Name + ".dll";
        string resource = Array.Find(Assembly.GetExecutingAssembly().GetManifestResourceNames(), element => element.EndsWith(resourceName));
        Assembly assembly;

        using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resource))
        {
            Byte[] assemblyData = new Byte[stream.Length];
            stream.Read(assemblyData, 0, assemblyData.Length);
            assembly = Assembly.Load(assemblyData);
            stream.Close();
        }

        return assembly;
    };

The assembly is returned and I can step further into the code but when instantiating a new object from the DLL's constructor I receive a TypeInitilizationException with an inner message saying "Assembly has been tampered".

Is there anyway around this or is my method of loading the DLL wrong?

EDIT

instance = new iConfServerDotNet();

also tried

System.Reflection.ConstructorInfo constructorInfo = typeof(iConfServerDotNet).GetConstructor(new Type[] { });

if (constructorInfo.DeclaringType.Name == "iConfServerDotNet")
{
    object o = constructorInfo.Invoke(new Object[] { }) as UserControl;
}

EDIT 2

The new code to get the type of class... and call it's contstructor. This still causes the same exception.

AppDomain.CurrentDomain.AssemblyResolve += (sender, args) =>
    {
        string resourceName = new AssemblyName(args.Name).Name + ".dll";
        string resource = Array.Find(Assembly.GetExecutingAssembly().GetManifestResourceNames(), element => element.EndsWith(resourceName));
        Assembly assembly;

        using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resource))
        {
            Byte[] assemblyData = new Byte[stream.Length];
            stream.Read(assemblyData, 0, assemblyData.Length);
            assembly = Assembly.Load(assemblyData);
            stream.Close();
        }

        Type type = assembly.GetModule(resourceName).GetType("iConfServer.NET.iConfServerDotNet");

        //object instance = type.GetConstructors()[0].Invoke(null);
        object instance = Activator.CreateInstance(type);

        return assembly;
    };

Exception occurs at Activator.CreatInstance(type);

Answer 1

Assuming these statements where correct (note that these where posted by the original posted in the comments underneath the question):

1. "The type initializer for .. threw an exception." at iConfServer.NET.iConfServerDotNet..ctor()"
2. The assembly has appropriate information when debugging

The problem probably lies in your way of invoking the constructor. I've created a simple testing library to show you how you can do this properly:

First, the testing library:

namespace TestLibrary
{
    public class Main
    {
        public string GetString()
        {
             return "Hey, I'm working well!";
        }
    }
 }

I've compiled this to an dynamic link library (.DLL) and added it as reference to an console application project (also, just for testing).

As a note, I've changed the Build Action property of the resource (you can open the property window by right clicking on the resource in the Solution Explorer and clicking Properties ) to Embedded Resource .

This is your code (I just changed the first part as I didn't need it, feel free to change it back) to load the library into our running application:

        string resourceName = "TestLibrary.dll";
        string resource = Array.Find(Assembly.GetExecutingAssembly().GetManifestResourceNames(), element => element.EndsWith(resourceName));
        Assembly assembly;

        using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resource))
        {
            Byte[] assemblyData = new Byte[stream.Length];
            stream.Read(assemblyData, 0, assemblyData.Length);
            assembly = Assembly.Load(assemblyData);
            stream.Close();
        }

Now, to create a new instance of the class we need to find the type of the class first:

       Type _typeOfClass = assembly.GetModule("TestLibrary.dll").GetType("TestLibrary.Main");

_typeOfClass will now contain the Type that leads us to The Main class inside the library. Next we are going to create a new instance of the class and we are going to invoke the GetString method to see if it actually worked:

         // Create an instance of the class invoking the (only) constructor. 
        object _instance = _typeOfClass.GetConstructors()[0].Invoke(null);
        // Call the method on the instance we just instantiated
        object result = _typeOfClass.GetMethod("GetString").Invoke(_instance, null);
        Console.WriteLine(result);

The Console will now show: Hey, I'm Working well! .

If you have multiple constructors and you just want to get the default constructor (no parameters) you can use object _instance = Activator.CreateInstance(_typeOfClass); too.