Hi there,
The issue DYNPROXY-ISSUE-128 was just created by cosborne (cosborne).
Key: DYNPROXY-ISSUE-128
Summary: Proxy without target passes wrong MethodInfo to interceptor
Type: Bug
Importance: High
Description:
I have a set of interfaces defined along the lines of the following:
public interface RootInterface
{
string RootMethod();
}
public interface InterfaceA : RootInterface
{
string CommonMethod();
}
public interface InterfaceB : RootInterface
{
string CommonMethod();
}
The proxy is then created using:
var gen = new ProxyGenerator();
var proxy =
(RootInterface)gen.CreateInterfaceProxyWithoutTarget(typeof(RootInterface),
new[] { typeof(InterfaceA), typeof(InterfaceB) }, new MyInterceptor());
The MyInterceptor lazily instantiates an object that implements either
InterfaceA or InterfaceB (but not both) based on data known only at runtime. It
then invokes the intercepted method directly against this target using:
public void Intercept(IInvocation invocation)
{
invocation.ReturnValue = invocation.Method.Invoke(GetTarget(),
invocation.Arguments);
Console.WriteLine("Intercepted");
}
If the target object is (only) an InterfaceB, and I call the following:
((InterfaceB)proxy).CommonMethod()
This throws a TargetException on the method invocation, as invocation.Method is
*always* the method as defined (invocation.Method.DeclaringType) on InterfaceA
even when called through a reference to InterfaceB as above.
Properties are affected in the same way.
It is possible for the proxy to determine through which particular interface a
method is called in a setup as above by implementing the additional interfaces
as explicit interface implementations and then to pass the correct MethodInfo
to the interceptor, but DynamicProxy does not appear to do this.
For more, see
http://support.castleproject.org/projects/DYNPROXY/issues/view/DYNPROXY-ISSUE-128
--
donjon
by Castle Stronghold
http://www.castle-donjon.com
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