/// <summary>
///
/// </summary>
/// <typeparam name="TData"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="bus"></param>
/// <param name="topic">消息主题</param>
/// <param name="handler">处理器</param>
public static void Unsubscribe <TData, TResult>(this IMessageBus bus, string topic, Func <object, TData, TResult> handler)
{
Guard.NotNull(bus, "bus");
Guard.NotNull(handler, "handler");
bus.Unsubscribe(topic, typeof(TData), ObserverHandler.CreateC <TData, TResult>(handler));
}
