Question

I am writing a decorating proxy using Castle DynamicProxy. I need the proxy’s interceptor to intercept only property writes (not reads) so I am checking the name of the method thusly:

public void Intercept(IInvocation invocation)
{
    if (invocation.Method.Name.StartsWith("set_")
    {
        // ...
    }

    invocation.Proceed();
}

Now this works fine but I don’t like the fact my proxy has intimate knowledge of how properties are implemented: I’d like to replace the method name check with something akin to:

if (invocation.Method.IsPropertySetAccessor)

Unfortunately my Google-fu has failed me. Any ideas?

Answer 1

You could check whether a property exists for which this method is the setter (untested):

bool isSetAccessor = invocation.Method.DeclaringType.GetProperties() 
        .Any(prop => prop.GetSetMethod() == invocation.Method)

(Inspiration taken from Marc’s answer to a related question.)