Monotouch：将Object转换为NSObject

NSDictionary.FromObjectAndKey();

int key = 2341;
var val = new MyClass();
NSDictionary.FromObjectAndKey(val, key); // obviously it does not work!!

public class NSObjectWrapper : NSObject
{
    public object Context;

    public NSObjectWrapper (object obj) : base()
    {
        this.Context = obj;
    }

    public static NSObjectWrapper Wrap(object obj)
    {
        return new NSObjectWrapper(obj);
    }
}

// wrap
var myNSObj = NSObjectWrapper.Wrap(new MyClass());
// unwrap
var myObj = myNSObj.Context as MyClass;

NSDictionary.FromObjectAndKey(NSObject.FromObject(val), NSObject.FromObject(key));