上文做了下Ajax与WCF进行json交互的简单介绍,本文阐述一个具体的实际应用:ExtJs与WCF交互,生成树.也很简单.先看看最终的效果吧:
第一步: 创建一个.net framework 3.5的网站项目ExtJsTreeWcf
第二步: 在网站项目中创建一个启用了Ajax的WCF服务WcfTreeService.svc,创建好之后,对该服务做如下的更改:
1)在WcfTreeService.svc中增加Factory="System.ServiceModel.Activation.WebServiceHostFactory",打开WcfTreeService.Svchtml编辑器的方法如下:
添加Factory之后的html为
2)去除web.config中的<enableWebScript/>
第三步:在WcfTreeService.svc修改代码为:
[DataContract]
publicclass
treenode
{
[DataMember]
publicstringid;
[DataMember]
publicstringtext;
[DataMember]
publicList<treenode>children=newList<treenode>();
[DataMember]
publicstringcls;
[DataMember]
publicboolleaf;
}
[ServiceContract(Namespace=""
)]
[AspNetCompatibilityRequirements(RequirementsMode=
AspNetCompatibilityRequirementsMode.Allowed)]
publicclass
WcfTreeService
{
//添加[WebGet]属性以使用HTTPGET
[OperationContract]
[WebInvoke(ResponseFormat=WebMessageFormat.Json)]
publictreenode[]GetTree()
{
//在此处添加操作实现
treenodet=newtreenode();
t.id="noe1";
t.text="节点1";
t.cls="folder";
treenodet0=newtreenode();
t0.id="noe1_0";
t0.text="节点1_0";
t0.cls="folder";
t0.leaf=true;
t.children.Add(t0);
treenodet1=newtreenode();
t1.cls="folder";
t1.id="000";
t1.text="节点1";
treenodet2=newtreenode();
t2.id="noe1_1";
t2.text="节点1_1";
t2.cls="folder";
t2.leaf=true;
t1.children.Add(t2);
List<treenode>nodes=newList<treenode>();
nodes.Add(t);
nodes.Add(t1);
returnnodes.ToArray();
}
//在此处添加更多操作并使用[OperationContract]标记它们
}
}
其中treenode是数据契约,而WcfTreeService是服务契约,服务操作GetTree返回Json编码格式数据
第四步:拷贝extjs的脚本资源拷贝到项目中的js目录,然后在default.aspx中添加对extjs脚本的引用:
<linkrel="stylesheet"type="text/css"href="js/ext2.1/resources/css/ext-all.css">
<scripttype="text/javascript"src="js/ext2.1/adapter/ext/ext-base.js"></script>
<scripttype="text/javascript"src="js/ext2.1/ext-all.js"></script>
第五步:在default.aspx增加如下的页面元素:
<h2>ExtJs与WCF交互-树</h2>
<divid="tree-div">
</div>
在<head></head>中添加如下脚本:
<scripttype="text/javascript">
Ext.onReady(function()
{
varTree=Ext.tree;
vartree=newTree.TreePanel({
rootVisible:false,
el:'tree-div',//目标div容器
width:175,
height:200,
autoScroll:true,
animate:true,
enableDD:true,
loader:newTree.TreeLoader({
dataUrl:'WcfTreeService.svc/GetTree'
})
});
varroot=newTree.AsyncTreeNode({
text:'根结点',
draggable:false,
id:'-100'
});
tree.setRootNode(root);
tree.render();
root.expand();
}
);
</script>
浏览页面default.aspx便出现文章开头的页面效果
利用httpwacth察看WcfTreeService.svc/GetTree的输出如下:
[{"children": [{"children":[],"cls":"folder","id":"noe1_0","leaf":true,"text":"节点 1_0"}],"cls":"folder","id":"noe1","leaf":false,"text":"节点1"}, {"children":[{"children":[],"cls":"folder","id":"noe1_1","leaf":true,"text": "节点1_1"}],"cls":"folder","id":"000","leaf":false,"text":"节点1"}]
程序示例项目: /Files/jillzhang/ExtJsTreeWcf.rar