/// <summary>
/// 取消注册双向回调实例
/// </summary>
/// <typeparam name="TContract">回调契约类型</typeparam>
/// <param name="clientHostName">客户端主机唯一识别名</param>
public static void UnregisterCallback <TContract>(string clientHostName) where TContract : class
{
transporter.UnregisterCallback <TContract>(clientHostName);
}