Question

It is possible to add proxy capabilities to an already generated and not empty object using Castle Dynamic Proxy?

I’ve tried this:

Dog _myDog=new Dog();
_myDog.Name="Fuffy";

var _proxyDog = generator.CreateClassProxyWithTarget<Dog>(_myDog, ProxyGenerationOptions.Default, new DogInterceptor());

_proxyDog results as a new object.

Now this is only an example, in real world application my object has 30+ properties and I want to know if I can avoid to copy those props one by one!

Answer 1

Yes it is. The only problem: ProxyGenerator needs to instantiate an object of that type anyway. This code is actually working correctly in my project:

public static class MongoExtensions
{
    static readonly ProxyGenerator pg = new ProxyGenerator();
    public static MongoCollection GetRetryCollection(this MongoDatabase db, string collectionName, int retryCount = 5, int pauseBetweenRetries = 2000)
    {
        var coll = db.GetCollection(collectionName);
        return (MongoCollection)pg.CreateClassProxyWithTarget(typeof(MongoCollection), coll, new object[] { db, collectionName, coll.Settings }, new RetryingInterceptor { RetryCount = retryCount, PauseBetweenCalls = pauseBetweenRetries });
    }
}

Paramerts of CreateClassProxyWithTarget are:

• type of the proxied object,
• proxied instance
• array of constructor paramers for the proxied type.
• interceptor for this proxy.

I can’t really explain, why it need constructor parameters for the object, but this code work correctly for me.