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<td align="center"><h1>AJAX调用WCF服务项模板[ASP.NET]</h1>
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来源：IT168 发布时间：2009-05-01 00:35:24 查看次数：<span id="News_Hits"></span><iframe style="display:none;" src="hits.asp?type=news&id=106"></iframe>
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<td style="word-break: break-all; word-wrap:break-word;"><div class="gray14">如果你打开后台代码文件，将看到如下形式的代码:</P><PRE><OL class=dp-c><LI class=alt><SPAN><SPAN class=keyword>namespace</SPAN><SPAN> WebUI </SPAN></SPAN><LI><SPAN>{ </SPAN><LI class=alt><SPAN> [ServiceContract(Namespace = </SPAN><SPAN class=string>""</SPAN><SPAN>)] </SPAN><LI><SPAN> [AspNetCompatibilityRequirements(RequirementsMode = </SPAN><LI class=alt><SPAN> AspNetCompatibilityRequirementsMode.Allowed)] </SPAN><LI><SPAN> </SPAN><SPAN class=keyword>public</SPAN><SPAN> </SPAN><SPAN class=keyword>class</SPAN><SPAN> HelloWorldService </SPAN><LI class=alt><SPAN> { </SPAN><LI><SPAN> [OperationContract] </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=keyword>public</SPAN><SPAN> </SPAN><SPAN class=keyword>void</SPAN><SPAN> DoWork() </SPAN><LI><SPAN> { </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=keyword>return</SPAN><SPAN>; </SPAN><LI><SPAN> } </SPAN><LI class=alt><SPAN> } </SPAN><LI><SPAN>} </SPAN></LI></OL></PRE>
<P>VS 2008会自动为你在web.config文件中添加一些必要的配置，因此不需要手工在web.config文件中添加任何配置。现在，继续并添加一个HelloWorld()方法，该方法返回一个“HelloWorld”的字符串并为该方法添加一个[OperationContract]特性。在本篇文章的后面我们将解释该特性。</P>
<P>现在，为Web应用程序工程添加一个页面并命名它为“HelloWorldTest.aspx”。从Visual Studio工具箱中拖拽一个Script Manager项到页面上。在ScriptManager 标签内部，添加一个到该服务的引用。下面给出了该代码示例：</P><PRE><OL class=dp-xml><LI class=alt><SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>asp:ScriptManager</SPAN><SPAN> </SPAN><SPAN class=attribute>ID</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"ScriptManager1"</SPAN><SPAN> </SPAN><SPAN class=attribute>runat</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"server"</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN></SPAN><LI><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>Services</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>asp:ServiceReference</SPAN><SPAN> </SPAN><SPAN class=attribute>Path</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"~/HelloWorldService.svc"</SPAN><SPAN> </SPAN><SPAN class=tag>/></SPAN><SPAN> </SPAN><LI><SPAN> </SPAN><SPAN class=tag></< SPAN><SPAN class=tag-name>Services</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI class=alt><SPAN class=tag></< SPAN><SPAN class=tag-name>asp:ScriptManager</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN></LI></OL></PRE>
<P>现在，添加一个button按钮和一个textbox文本框到页面上，并为该按钮添加点击事件处理程序，以使用JavaScript函数来调用服务。当你编写服务调用函数时，Visual Studio 2008 HTML编辑器将提供智能感知功能以方便编写必要的函数调用。完整的HTML代码如下所示：</P><PRE><OL class=dp-xml><LI class=alt><SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>form</SPAN><SPAN> </SPAN><SPAN class=attribute>id</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"form1"</SPAN><SPAN> </SPAN><SPAN class=attribute>runat</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"server"</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN></SPAN><LI><SPAN class=tag><</SPAN><SPAN class=tag-name>div</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>script</SPAN><SPAN> </SPAN><SPAN class=attribute>language</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"javascript"</SPAN><SPAN> </SPAN><SPAN class=attribute>type</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"text/javascript"</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI><SPAN> function GetValueFromServer() { </SPAN><LI class=alt><SPAN> HelloWorldService.HelloWorld(onSuccess, onFailure); </SPAN><LI><SPAN> } </SPAN><LI class=alt><SPAN> function onSuccess(result) { </SPAN><LI><SPAN> document.getElementById('txtValueContainer')</SPAN><SPAN class=attribute>.value</SPAN><SPAN> = </SPAN><SPAN class=attribute-value>result</SPAN><SPAN>; </SPAN><LI class=alt><SPAN> } </SPAN><LI><SPAN> </SPAN><LI class=alt><SPAN> function onFailure(result) { </SPAN><LI><SPAN> window.alert(result); </SPAN><LI class=alt><SPAN> } </SPAN><LI><SPAN> </SPAN><SPAN class=tag></< SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>asp:ScriptManager</SPAN><SPAN> </SPAN><SPAN class=attribute>ID</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"ScriptManager1"</SPAN><SPAN> </SPAN><SPAN class=attribute>runat</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"server"</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>Services</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>asp:ServiceReference</SPAN><SPAN> </SPAN><SPAN class=attribute>Path</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"~/HelloWorldService.svc"</SPAN><SPAN> </SPAN><SPAN class=tag>/></SPAN><SPAN> </SPAN><LI><SPAN> </SPAN><SPAN class=tag></< SPAN><SPAN class=tag-name>Services</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=tag></< SPAN><SPAN class=tag-name>asp:ScriptManager</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>input</SPAN><SPAN> </SPAN><SPAN class=attribute>id</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"btnServiceCaller"</SPAN><SPAN> </SPAN><SPAN class=attribute>type</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"button"</SPAN><SPAN> </SPAN><SPAN class=attribute>value</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"Get Value"</SPAN><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><SPAN class=attribute>onclick</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"GetValueFromServer()"</SPAN><SPAN>; </SPAN><SPAN class=tag>/></SPAN><SPAN> </SPAN><LI><SPAN> </SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>input</SPAN><SPAN> </SPAN><SPAN class=attribute>id</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"txtValueContainer"</SPAN><SPAN> </SPAN><SPAN class=attribute>type</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"text"</SPAN><SPAN> </SPAN><SPAN class=attribute>value</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>""</SPAN><SPAN> </SPAN><SPAN class=tag>/></SPAN><SPAN> </SPAN><LI class=alt><SPAN class=tag></< SPAN><SPAN class=tag-name>div</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN><LI><SPAN class=tag></< SPAN><SPAN class=tag-name>form</SPAN><SPAN class=tag>></SPAN><SPAN> </SPAN></LI></OL></PRE>
<P>注意，当调用服务时，我们传递了两个方法：一个用于进行回调而另一个用于错误回调。如果我们需要传递任何参数到该函数中，这些参数会首先传递进去然后再进行回调。</P>
<P>因此，如果我们有一个名为getvalue 的函数并接收两个字符串参数，那么我们将以[NameSpaceName].[ServiceName].getvalue(“value one”,”value two”,on_success,on_error);的方式调用该函数，此刻on_success和on_error各自表示回调和错误回调。</P></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN><div class="thisPageNav"><a href="article/106.html">第1页</a> <a href="article/106_2.html"><strong>第2页</strong></a> </div></div></td>
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