MissingMethodException on Google Contact embedded dll

Question

I want make a c# Library (library scope is communication with Google contact api) with dependency embedded in library.

So, in my class constructor i put this code:

AppDomain.CurrentDomain.AssemblyResolve += (sender, evento) =>
            {
                var assemblyName = evento.Name.Split(',')[0].Trim();
                if (assemblyName.ToLower().Equals("google.gdata.contacts"))
                    return Assembly.Load(Assembly.GetExecutingAssembly().GetEmbeddedResource("Contacts.Assembly.Google.GData.Contacts.dll"));
                else if (assemblyName.ToLower().Equals("google.gdata.client"))
                    return Assembly.Load(Assembly.GetExecutingAssembly().GetEmbeddedResource("Contacts.Assembly.Google.GData.Client.dll"));
                else if (assemblyName.ToLower().Equals("google.gdata.extensions"))
                    return Assembly.Load(Assembly.GetExecutingAssembly().GetEmbeddedResource("Contacts.Assembly.Google.GData.Extensions.dll"));
                else if (assemblyName.ToLower().Equals("newtonsoft.json"))
                    return Assembly.Load(Assembly.GetExecutingAssembly().GetEmbeddedResource("Contacts.Assembly.Newtonsoft.Json.dll"));

                return null;
            };

In this way, when AppDomain try to resolve Google contact library or its dependency i return my embedded assembly. This WORK!!!

My problem is when i call this code:

RequestSettings settings = new RequestSettings("ApplicationName");
ContactsRequest cr = new ContactsRequest(settings);
Feed<Google.Contacts.Contact> f = cr.GetContacts();

This code same work for RequestSettings (this class is in google.data.client.dll) but when try to create ContactRequest instance (this class is in google.data.contacts.dll) it raise "MissingMethodException".

Why code return this error?

Answer 1

Check your google.data.contacts.dll: probably it depends on another dll you are not including (e.g. log4net).

Check also your inner exception, it should include details on it.

Answer 2

I found problem!!! Unlike, AssemblyResolve event is raise each time that caller use an not referenced assembly. But, in my code I loaded each time the same assembly but for AppDomain they are different assembly. In example:

MyDLL raise AssemblyResolve to load: google.gdata.client and google.gdata.contact then application instance ContactRequest (google.gdata.contact). But this dll raise AssemblyResolve to load: google.gdata.client

For AppDomain google.gdata.client (loaded in MyDLL) is different to google.gdata.client (loaded for google.gdata.contact).

To resolve problem, build a dictionary with all dll to load, so when domain request to resolve an Assembly the code return ever same Assembly