Fixed possible ambiguous match of async methodinfo
Fixed possible ambiguous match of async methodinfo

jweber/WcfClientProxyGenerator,jweber/WcfClientProxyGenerator,cmenzi/WcfClientProxyGenerator,jweber/WcfClientProxyGenerator,18098924759/WcfClientProxyGenerator,cmenzi/WcfClientProxyGenerator,cmenzi/WcfClientProxyGenerator,18098924759/WcfClientProxyGenerator,18098924759/WcfClientProxyGenerator