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<td align="center"><h1>AJAX的类库中使用服务接口定义[ASP.NET]</h1>
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来源：IT168 发布时间：2009-05-01 00:34:14 查看次数：<span id="News_Hits"></span><iframe style="display:none;" src="hits.asp?type=news&id=105"></iframe>
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<td style="word-break: break-all; word-wrap:break-word;"><div class="gray14"><P>下面，我们将了解更多传统的WCF服务实现，并且我们也将了解如何通过ASP.NET AJAX向外暴露该服务。默认情况下，当我们创建类库工程时，对于需要运行的WCF系统不会添加服务模型和对运行时序列化的支持。因此，我们不得不添加必要的服务引用。</P>
<P>继续并点击类库工程鼠标右键然后选择添加引用，再选择如下引用：</P>
<P>System.Runtime.Serialization <BR>System.ServiceModel</P>
<P><img onload="ImageZoom(this,560,700)" id="" alt="" src="upfiles/edit/200905/200905010034571981.jpg" border=0></P>
<P>此阶段，我们将使用一个TODO管理示例来演示整个过程。添加一个基于数据库的服务然后创建一个带有字段为ID, Description和Status 的标TODO。现在，从项目模板中添加一个LINQ to SQL的类文件。从数据库中拖拽TODO表到LINQ to SQL类文件设计器上。</P>
<P>现在添加设计器表面并从属性窗口改变序列化模式为单向的。这样，我们的设计器就生成了可以供WCF使用的LINQ to SQL类。如果你想使用自定义用户定义类型，你必须为你的类设置[DataContract]特性并且你必须为你想暴露的WCF服务类的每个属性添加[DataMember]特性。</P>
<P>现在，我们将添加一个如下形式的服务接口:</P><PRE><OL class=dp-xml><LI class=alt><SPAN><SPAN>namespace ServiceLibrary </SPAN></SPAN><LI><SPAN>{ </SPAN><LI class=alt><SPAN> [ServiceContract(</SPAN><SPAN class=attribute>Namespace</SPAN><SPAN> = </SPAN><SPAN class=attribute-value>"ServiceLibrary"</SPAN><SPAN>)] </SPAN><LI><SPAN> interface IToDoService </SPAN><LI class=alt><SPAN> { </SPAN><LI><SPAN> [OperationContract] </SPAN><LI class=alt><SPAN> ToDo GetToDo(long ID); </SPAN><LI><SPAN> [OperationContract] </SPAN><LI class=alt><SPAN> ToDo AddToDo(ToDo toDo); </SPAN><LI><SPAN> [OperationContract] </SPAN><LI class=alt><SPAN> bool DeleteToDo(ToDo todo); </SPAN><LI><SPAN> [OperationContract] </SPAN><LI class=alt><SPAN> ToDo UpdateToDo(ToDo todo); </SPAN><LI><SPAN> [OperationContract] </SPAN><LI class=alt><SPAN> List</SPAN><SPAN class=tag><</SPAN><SPAN class=tag-name>ToDo</SPAN><SPAN class=tag>></SPAN><SPAN> GetAllToDo(); </SPAN><LI><SPAN> } </SPAN><LI class=alt><SPAN>} </SPAN></LI></OL></PRE>
<P>注意，在ServiceContract 接口特性中我们已经提到的一个命名空间。这点很重要。我们将使用该名字作为服务的名称以便内部的JavaScript代码访问该服务。下面，我们将添加实现该服务的接口；其代码如下。</P>
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