The service needs to receive input parameters from the external client and return output parameters to it and define this in WSDL.
服务需要从外部客户端接收输入参数，并将输出参数返回到它，同时在WSDL 中对此进行定义。
Having defined the operations (or methods), you now need to specify the parameters that you will send to them and the parameters that they will return.
定义好操作(或方法)以后，现在需要指定将向它们发送和从它们返回的参数。
The server simply unpacks the parameters of the request, performs the operation, packages up the return value and out parameters, and sends the response back to the client.
服务器只是将请求中的参数解包，执行运算，将返回值和输出参数打包，然后向客户机发回响应。
The formal parameters of the C# indexer become the parameters of the corresponding UML operation and the type of the indexer becomes the return type of the UML operation.
C#索引器的形式参数成为相应的UML操作的参数，而索引器的类型成为 UML 操作的返回类型。
They can accept parameters, output parameters, return single or multiple result sets, and return values.
它们可以接受参数、输出参数、返回单个或多个结果集以及返回值。
Output parameters and return values are not sent to the client; these are available to the caller, through the parameters collection of the command object.
输出参数和传回值不会传送至用户端，它们可透过命令物件的参数集合而用于呼叫端。
Output parameters and return values are not sent to the client; these are available to the caller, through the parameters collection of the command object.
输出参数和传回值不会传送至用户端，它们可透过命令物件的参数集合而用于呼叫端。
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