使用WebService

WebService返回String
WebServiceTest.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="wsBlogAggr.Readxml.send()">
    <mx:Script>
        <![CDATA[
            import mx.rpc.events.ResultEvent;
            import mx.controls.Alert;

            public function wsHandle(e:ResultEvent):void
            {
                ddd.text = e.result as String;
            }
        ]]>
    </mx:Script>
    <mx:Label text="Label" id="ddd" fontSize="12"/>
    <mx:WebService id="wsBlogAggr" wsdl="http://localhost:2250/flex%203.0%20asp.net%20test/WebServiceTest.asmx?wsdl" useProxy="false">
    <mx:operation name="Readxml" result="wsHandle(event);" fault="Alert.show(event.fault.faultString,'Error')" />
    </mx:WebService>
</mx:Application>

ActiveWebService.mxml，使用动态创建WebService组件方法调用WebService。必须调用loadwsdl方法下载ws说明文件，否则即使调用webservice的方法也是没有反应的。如果WebService方法要求提供参数，可在send()中加上，如send("新闻表",2)

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="AvitHandle()">
    <mx:Script>
        <![CDATA[
            import mx.rpc.events.FaultEvent;
            import mx.rpc.soap.WebService;
            import mx.rpc.events.ResultEvent;
            import mx.controls.Alert;

            public function AvitHandle():void
            {
                var web:WebService = new WebService();
                web.wsdl = "http://localhost:2250/flex%203.0%20asp.net%20test/WebServiceTest.asmx?wsdl";
                //必须调用loadwsdl方法下载ws说明文件，否则即使调用webservice的方法也是没有反应的
                web.loadWSDL();
                //添加成功调用侦听
                web.addEventListener(ResultEvent.RESULT,wsHandle);
                //添加错误调用侦听
                web.addEventListener(FaultEvent.FAULT, fault);
                web.Readxml.send();
            }

            //成功调用处理函数
            public function wsHandle(e:ResultEvent):void
            {
                ddd.text = e.result as String;
            }

            //错误处理函数
            public function fault(e:FaultEvent):void
            {
                Alert.show(e.fault.faultString,'Error')
            }
        ]]>
    </mx:Script>
    <mx:Label text="Label" id="ddd" fontSize="12"/>
</mx:Application>

ServiceTest.asmx

using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;

using System.Xml;

/// <summary>
/// WebServiceTest 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class WebServiceTest : System.Web.Services.WebService {

    public WebServiceTest () {

        //如果使用设计的组件，请取消注释以下行
        //InitializeComponent();
    }

    [WebMethod]
    public String Readxml()
    {
        return "你还好吗？";
    }

}

使用WebService返回xml格式字符串，供tree组件使用。注意,tree组件要使用<node label="Mail">，属性的方法定义，而不是字段。xml可以嵌套，tree组件自动解析。
eem.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="AvitHandle()">
    <mx:Script>
        <![CDATA[
            import mx.rpc.events.FaultEvent;
            import mx.rpc.soap.WebService;
            import mx.rpc.events.ResultEvent;
            import mx.controls.Alert;

            public function AvitHandle():void
            {
                var web:WebService = new WebService();
                web.wsdl = "http://localhost:2250/flex%203.0%20asp.net%20test/WebServiceTest.asmx?wsdl";
                //必须调用loadwsdl方法下载ws说明文件，否则即使调用webservice的方法也是没有反应的
                web.loadWSDL();
                //添加成功调用侦听
                web.addEventListener(ResultEvent.RESULT,wsHandle);
                //添加错误调用侦听
                web.addEventListener(FaultEvent.FAULT, fault);
                web.Readxml2.send();
            }

            //成功调用处理函数
            public function wsHandle(e:ResultEvent):void
            {
                ddd.text = e.result as String;
                var menus:XML = XML(e.result as String);
                var results:XMLList = menus.node;
                tree.dataProvider = results;
            }

            //错误处理函数
            public function fault(e:FaultEvent):void
            {
                Alert.show(e.fault.faultString,'Error')
            }
        ]]>
    </mx:Script>
    <mx:Label text="Label" id="ddd" fontSize="12"/>
    <mx:Tree id="tree" width="218" height="397" labelField="@label"></mx:Tree>
</mx:Application>

Webservice方法源代码