本篇随笔主要是关于Flex与asp.net的WebService通讯，其中利用了SoapHeader。(如果你对SoapHeader不了解，可以参考WebService开发(一);如何使用Soap头)。由此可见WebService在跨平台方面的优势。;
　　ASP.NET的WebService代码

以下是引用片段：

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

[WebService(Namespace;=;"http://davidfan.cnblogs.com")]//名称空间应该和Flex中定义相同
[WebServiceBinding(ConformsTo;=;WsiProfiles.BasicProfile1_1)]
public;class;Service;:;System.Web.Services.WebService
{
public;ValidateSoapHeader;header;
[WebMethod]
[SoapHeader("header")]
public;string;HelloWorld()
{
if;(header;==;null)
{
return;"请提供验证信息.";
}
else
{
if;(header.Name;==;"admin";&&;header.Password;==;"admin")
{
if;(header.ExDate;<;DateTime.Now)
{
return;"帐号过期";
}
else
{
return;"验证成功";
}
}
else
{
return;"用户名或密码错误";
}
}
}

}

/**////;<summary>
///;继承自SoapHeader的自定义类
///;</summary>
public;class;ValidateSoapHeader;:;System.Web.Services.Protocols.SoapHeader
{
public;ValidateSoapHeader()
{
}
public;ValidateSoapHeader(string;name,;string;password,;DateTime;dt)
{
this.name;=;name;
this.password;=;password;
this.exDate;=;dt;
}

private;string;name;
public;string;Name
{
get;{;return;name;;}
set;{;name;=;value;;}
}

private;string;password;
public;string;Password
{
get;{;return;password;;}
set;{;password;=;value;;}
}

private;DateTime;exDate;
public;DateTime;ExDate
{
get;{;return;exDate;;}
set;{;exDate;=;value;;}
}
}

　Flex的mxml、as代码

　　mxml

以下是引用片段：
<?xml;version="1.0";encoding="utf-8"?>
<mx:Application;xmlns:mx="http://www.adobe.com/2006/mxml";layout="absolute";fontFamily="simsun";fontSize="12">
<mx:Script>
<![CDATA[
import;WebServiceUtility.Info;
import;mx.rpc.events.FaultEvent;
import;mx.rpc.events.ResultEvent;
import;mx.rpc.soap.SOAPHeader;

private;function;SendRequest():void
{
var;content:Info;=;new;Info();
content.Name;=;UserName.text;
content.Password;=;PassWord.text;
content.ExDate;=;new;Date(2010,;3,;10);
//关键在QName的构造函数
//第一个参数要和.Net的WebService的名称空间相同
//第二个参数要和.Net的WebService的继承自SoapHeader的自定义类名称相同
var;qname:QName;=;new;QName("http://davidfan.cnblogs.com","ValidateSoapHeader");
var;header:SOAPHeader;=;new;SOAPHeader(qname,content);

ws.clearHeaders();
ws.addHeader(header);
ws.HelloWorld();
}
private;function;OnResult(event:ResultEvent):void{
Result.text=;event.result.toString();
}
private;function;OnFault(event:FaultEvent):void{
Result.text=;event.message.toString();
}
]]>
</mx:Script>
<mx:WebService;id="ws";wsdl="http://localhost:9200/WebSite2/Service.asmx?WSDL"
result="OnResult(event)";fault="OnFault(event)"/>
<mx:TextInput;id="UserName";x="98";y="94"/>
<mx:TextInput;id="PassWord";x="98";y="124"/>
<mx:Label;x="29";y="98";text="用户名:"/>
<mx:Label;x="29";y="128";text="密　码:"/>
<mx:Button;x="98";y="184";label="调用";click="SendRequest()"/>
<mx:Label;x="29";y="156";text="结　果:"/>
<mx:TextInput;id="Result";x="98";y="154"/>
</mx:Application>;;


　　as

以下是引用片段：
package;WebServiceUtility
{
public;class;Info{
//该类名称可以和.Net中的ValidateSoapHeader不同
//但字段要对应拼写相同
public;var;Name:String;
public;var;Password:String;
public;var;ExDate:Date;
}
};

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