[转]Web Services使用out参数

本文转自：http://www.cnblogs.com/zhaozhan/archive/2010/10/25/1860837.html

Web Services使用out参数，在SOAP协议中会跟返回值一样作为SOAP响应的内容返回。

Web Services定义：

 1:  public class WebService1 : System.Web.Services.WebService

 2:  {

 3:      [WebMethod]

 4:      public string HelloWorld(out int outParamInt,out TestClass outParamObject)

 5:      {

 6:          outParamInt = 10;

 7:          outParamObject = new TestClass() { ID=1,Name="XX"};

 8:          return "Hello World";

 9:      }

10:  }

11:   

12:  public class TestClass

13:  {

14:      public int ID{get;set;}

15:      public string Name{get;set;}

16:  }

17:   

定义两个out参数：一个int，一个复杂类型的。生成的SOAP：

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length
 
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <HelloWorldResponse xmlns="http://tempuri.org/">
      <HelloWorldResult>string</HelloWorldResult>
      <outParamInt>int</outParamInt>
      <outParamObject>
        <ID>int</ID>
        <Name>string</Name>
      </outParamObject>
    </HelloWorldResponse>
  </soap:Body>
</soap:Envelope>

客户端的使用，生成的客户端代码：

1:  public string HelloWorld(out int outParamInt, out Client.localhost.TestClass outParamObject) {

2:      Client.localhost.HelloWorldRequest inValue = new Client.localhost.HelloWorldRequest();

3:      inValue.Body = new Client.localhost.HelloWorldRequestBody();

4:      Client.localhost.HelloWorldResponse retVal = ((Client.localhost.WebService1Soap)(this)).HelloWorld(inValue);

5:      outParamInt = retVal.Body.outParamInt;

6:      outParamObject = retVal.Body.outParamObject;

7:      return retVal.Body.HelloWorldResult;

8:  }

9:   

测试代码：

1:  static void Main(string[] args)

2:  {

3:      localhost.WebService1SoapClient c = new localhost.WebService1SoapClient();

4:      localhost.TestClass testClass1;

5:      int i;

6:      c.HelloWorld(out i,out testClass1);

7:  }

8:   

对于其他的客户端，可以跟返回值一样获取out参数。如Flex：

Flex测试代码：

 1:  <?xml version="1.0" encoding="utf-8"?>

 2:  <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 

 3:                 xmlns:s="library://ns.adobe.com/flex/spark" 

 4:                 xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"

 5:                 creationComplete="app_creationCompleteHandler(event)" >

 6:  <fx:Declarations>

 7:  <!-- 将非可视元素（例如服务、值对象）放在此处 -->

 8:  <s:WebService id="MyService" wsdl="http://localhost:1552/WebService1.asmx?WSDL">

 9:  <s:operation name="HelloWorld" result="onResult(event)"/>

10:          </s:WebService>

11:  </fx:Declarations>

12:      <fx:Script>

13:  <![CDATA[

14:              import mx.events.FlexEvent;

15:              import mx.rpc.events.ResultEvent;

16:   

17:              private function onResult(evnet:ResultEvent):void

18:  {

19:  

20:              }

21:  protected function app_creationCompleteHandler(event:FlexEvent):void

22:  {

23:                  MyService.HelloWorld();

24:              }

25:  

26:           ]]>

27:  </fx:Script>

28:  </s:Application>

跟踪onResult的event的result：