类型“<var>Type Name</var>”中的 OperationContract 方法“<var>Method name</var>”不能正确实现异步模式，因为找到了多个相应方法“X”。使用异步模式时，必须仅提供一端方法。删除或重命名一个或多个“X”方法，只留下一个即可；或者将方法“<var>Method name</var>”上的 AsyncPattern 属性设置为 false。

OperationContract method '<var>Method name</var>' in type '<var>Type Name</var>' does not properly implement the async pattern, as more than one corresponding method 'X' was found. When using the async pattern, exactly one end method must be provided. Either remove or rename one or more of the 'X' methods such that there is just one, or set the AsyncPattern property on method '<var>Method name</var>' to false.

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