Web Services uses out parameters

Web Services uses the out parameter. In the SOAP protocol, it returns the same content as the return value as the SOAP response.

Web Services Definition:

 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:   

Defines two out parameters: an int and a complex type. Generated SOAP:

HTTP/1.1 200 OKContent-Type: text/xml; charset=utf-8Content-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>

 

The generated client code is as follows:

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:   

Test code:

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:   

For other clients, you can obtain the out parameter like the return value. For example, Flex:

Flex test code:

 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: <! -- Place non-visual elements (such as services and value objects) Here -->

 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>

The result of the event that tracks onResult: