Mark the Begin method of the asynchronous method pair with the System.ServiceModel.OperationContractAttribute attribute and set the System.ServiceModel.OperationContractAttribute.AsyncPattern property to true.是什么意思_Mark the Begin method of the asynchronous method pair with the System.ServiceModel.OperationContractAttribute attribute and set the System.ServiceModel.OperationContractAttribute.AsyncPattern property to true.在线翻译_英语_读音_用法_例句