public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
if (binder.Name.StartsWith("Begin") && args.Length >= 2)
{
//if the 2nd last argument is either null or convertible to an AsyncCallback, then we decide this is
//an async call
object callbackArg = args[args.Length - 2];
AsyncCallback callback = callbackArg as AsyncCallback;
if (callbackArg == null || callback != null)
{
string methodName = binder.Name.Substring(5);
object[] newArgs = new object[args.Length - 2];
Array.Copy(args, newArgs, args.Length - 2);
object state = args[args.Length - 1];
result = client.Call(serviceName, methodName, newArgs, callback, state);
return(true);
}
}
PendingCall pendingCall;
if (binder.Name.StartsWith("End") && args.Length == 1 && args[0] is IAsyncResult)
{
pendingCall = (PendingCall)args[0];
}
else
{
pendingCall = client.Call(serviceName, binder.Name, args, null, null);
}
//We always block for a response on dynamic calls, because there's no way to tell if the user is expecting
//a return type. Attempting to block in the DynamicCallResult is possible, but makes it difficult to clean
//up the PendingCall as the TryConvert may never be called.
pendingCall.AsyncWaitHandle.WaitOne();
pendingCall.AsyncWaitHandle.Close();
if (pendingCall.IsFailed)
{
throw new InvalidRpcCallException(serviceName, binder.Name,
String.Format("Server failed to process call, returned error message: \"{0}\".",
pendingCall.ServerErrorMessage));
}
result = new DynamicCallResult(pendingCall);
return(true);
}
protected IAsyncResult BeginAsyncCallHelper(string methodName, RpcMessage.Parameter[] parameters,
AsyncCallback callback, object state)
{
return(client.Call(serviceName, methodName, parameters, callback, state));
}