Dynamic Proxy 2: Mixins
time to read 25 min | 4873 words

I needed a rest from dealing with SSIS and data migrations issues, so I decided to put some time in real code. I just finished adding support for Mixins to Dynamic Proxy 2. Here is the first test that passed, the name should tell you quite a bit about what is required to make it work.

[Test]

public void CanCreateSimpleMixinWithoutGettingExecutionEngineExceptionsOrBadImageExceptions()

{

       ProxyGenerationOptions proxyGenerationOptions = new ProxyGenerationOptions();

       proxyGenerationOptions.AddMixinInstance(new SimpleMixin());

       object proxy = generator.CreateClassProxy(

              typeof(object), proxyGenerationOptions, new AssertInvocationInterceptor());

 

       Assert.IsTrue(proxy is ISimpleMixin);

 

       ((ISimpleMixin)proxy).DoSomething();

}

The generated proxy looks something like this one:

public class ObjectProxyefb7dccd21fe43b5b2d13c788dce3bdb : ISimpleMixin

{

    public IInterceptor[] __interceptors;

    public ISimpleMixin __mixin_Castle_DynamicProxy_Test_Mixins_ISimpleMixin;

    public static MethodInfo tokenCache1 = ((MethodInfo) methodof(ISimpleMixin.DoSomething, ISimpleMixin));

    public static Type typeTokenCache = typeof(object);

 

    public ObjectProxyefb7dccd21fe43b5b2d13c788dce3bdb(ISimpleMixin mixin1, IInterceptor[] interceptorArray1)

    {

        this.__mixin_Castle_DynamicProxy_Test_Mixins_ISimpleMixin = mixin1;

        this.__interceptors = interceptorArray1;

    }

 

    public override int DoSomething()

    {

        object[] objArray = new object[0];

        InvocationDoSomething_1 g_ = new InvocationDoSomething_1(
             this.__mixin_Castle_DynamicProxy_Test_Mixins_ISimpleMixin,
             this.__interceptors, typeTokenCache, tokenCache1, objArray, this);

        g_.Proceed();

        return (int) g_.ReturnValue;

    }

 

    [Serializable]

    public sealed class InvocationDoSomething_1 : AbstractInvocation

    {

        public ISimpleMixin target;

 

        public InvocationDoSomething_1(ISimpleMixin mixin1, IInterceptor[] interceptorArray1, Type type1, MethodInfo info1,
               object[] objArray1, object obj1) : base(mixin1, obj1, interceptorArray1, type1, info1, objArray1)

        {

            this.target = mixin1;

        }

 

        public sealed override void InvokeMethodOnTarget()

        {

            int num = this.target.DoSomething();

            base.ReturnValue = num;

        }

    }

}

 

The code is in the repository, if you feel like taking it out for a spin.

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