admin - 2008-6-26 11:58:00
Silverlight提供了几个类来帮助我们方便地转换从WCF获取的JSON数据。它们是:íS
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íS
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DataContractJsonSerializer (位于 System.Runtime.Serialization.Json)íS
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íS
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JsonObject (位于System.Json,将JSON数据流转换成为可读写的对象)íS
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íS
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JsonArray (位于System.Json, 对JSON数据流转换成为JsonObject数组形式,可支持LINQ查询)íS
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íS
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注:如果要引用System.Runtime.Serialization.Json名空间里的Json,则必须也引用System.ServiceModel,íS
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否则Json会无法使用。íS
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íS
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这三类以都支持Stream类型参数,而该参数就是从WCF获取的JSON数据流。使用它们也很简单,首先我们需íS
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要建立一个AJAX型WCF,如下图:íS
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íS
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íS
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íS
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因为我们是获取用户数据,所以将这个WCF命名为UserService.cs:íS
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íS
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然后对这个WCF做如下修改:íS
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íS
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1.对SVC头文件添加WebServiceHostFactory,如下:íS
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íS
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íS
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£Hª;www.netcsharp.cnÅÑà×AŰi<%@ ServiceHost Language="C#" Debug="true" Service="UserService"íS
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Factory="System.ServiceModel.Activation.WebServiceHostFactory"íS
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2.注释web.config中的enableWebScript节点,如下:íS
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íS
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<behavior name="UserServiceAspNetAjaxBehavior">íS
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<!--<enableWebScript />-->íS
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</behavior>íS
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当然这里所用的WCF为,主要是为了支持形如下面的请求链接方式:íS
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íS
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http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUseríS
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íS
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而下面就是WCF中的代码段:íS
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íS
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[DataContract]íS
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public class UserInfoíS
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{íS
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[DataMember]íS
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public string Name { get; set; }íS
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[DataMember]íS
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public string Address { get; set; }íS
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[DataMember]íS
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public int Age { get; set; }íS
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[DataMember]íS
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public bool IsMember { get; set; }íS
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íS
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}íS
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íS
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[ServiceContract(Namespace = "")]íS
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[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]íS
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public class UserServiceíS
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{íS
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List<UserInfo> userList = new List<UserInfo>íS
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{íS
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new UserInfo {Name = "赵二", Address = "北京", Age = 2, IsMember = true},íS
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new UserInfo {Name = "张三", Address = "北京", Age = 3, IsMember = false},íS
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new UserInfo {Name = "李四", Address = "北京", Age = 4, IsMember = true},íS
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new UserInfo {Name = "王五", Address = "北京", Age = 5, IsMember = false},íS
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};íS
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íS
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[OperationContract]íS
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[WebGet(ResponseFormat = WebMessageFormat.Json, UriTemplate = "GetUser")]íS
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public UserInfo GetUser()íS
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{íS
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return new UserInfo() { Name = "张三", Address = "北京", Age = 3, IsMember = true };íS
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}íS
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íS
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[OperationContract]íS
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[WebGet(ResponseFormat = WebMessageFormat.Json, UriTemplate = "GetUserListByAge/{age}")]íS
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public UserInfo GetUserListByAge(string age)íS
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{íS
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return (from u in userListíS
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where u.Age == int.Parse(age)íS
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select new UserInfoíS
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{íS
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Age = u.Age,íS
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Name = u.Name,íS
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IsMember = u.IsMember,íS
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Address = u.AddressíS
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}).SingleOrDefault();íS
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}íS
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íS
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[OperationContract]íS
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[WebGet(ResponseFormat = WebMessageFormat.Json, UriTemplate = "GetUserList")]íS
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public List<UserInfo> GetUserList()íS
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{íS
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return userList;íS
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}íS
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}íS
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íS
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上面代码中的方法:íS
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GetUser() //对应DataContractJsonSerializer的调用演示íS
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GetUserList(string age) //对应JsonObject的调用演示íS
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GetAllUser() //对应JsonArray的调用演示íS
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íS
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分别使用了WebGet属性(位于System.ServiceModel.Web),且ResponseFormat皆为WebMessageFormat.JsoníS
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(当然也支持WebMessageFormat.Xml)。而UriTemplate属性为该服务所支持的浏览器链接地址。íS
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íS
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当对上面的WCF编译运行之后,我们在浏览器中输入下面地址:íS
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íS
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http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUser //参见UriTemplate设置íS
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íS
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则此时IE会弹出一个保存窗口,如下截图:íS
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íS
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íS
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íS
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而保存到本地的文件内容如下:íS
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íS
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£Hª;www.netcsharp.cnÅÑà×AŰi{"Address":"北京","Age":12,"IsMember":true,"Name":"张三"}íS
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看来通过对上述链接的调用,WCF会直接将我们想要的用户信息转换成JSON格式。íS
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íS
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注:另个两个链接及其返回JSON内容分别如下所示íS
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http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUserListByAge/2íS
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íS
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£Hª;www.netcsharp.cnÅÑà×AŰi{"Address":"北京","Age":2,"IsMember":true,"Name":"赵二"}íS
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£Hª;www.netcsharp.cnÅÑà×AŰi íS
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http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUserListíS
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íS
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[{"Address":"北京","Age":2,"IsMember":false,"Name":"赵二"},íS
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{"Address":"北京","Age":3,"IsMember":false,"Name":"张三"},íS
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{"Address":"北京","Age":4,"IsMember":false,"Name":"李四"},íS
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{"Address":"北京","Age":5,"IsMember":false,"Name":"王五"}]//自动转成JSON数组íS
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下面我们就来看一下Silverlight是何使用来解析上面传回来的JSON数据的.íS
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íS
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首先看一下使用DataContractJsonSerializer的示例(详见注释):íS
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íS
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private void GetUserToDataContract_Click(object sender, RoutedEventArgs e)íS
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{íS
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Uri serviceUri = new Uri("http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUser");íS
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WebClient webClient = new WebClient();íS
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webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);íS
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webClient.OpenReadAsync(serviceUri);íS
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} íS
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íS
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void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)íS
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{íS
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//声明一个UserInfo类型的DataContractJsonSerializer实例íS
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DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(UserInfo));íS
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//获取JSON数据流的信息,并将它转换成为UserInfo实例íS
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UserInfo userInfo = (UserInfo)serializer.ReadObject(e.Result);//e.Result为JSON流数据íS
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íS
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//下面显示userInfo中的数据信息íS
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UserList.Items.Add(string.Format("Name:{0}, Address:{1}, Age:{2}, IsMember:{3} ",íS
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userInfo.Name,íS
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userInfo.Address,íS
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userInfo.Age,íS
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userInfo.IsMember));íS
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}íS
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íS
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因为DataContractJsonSerializer支持将JSON转换成本地的对象类型,所以我们可以像使用普通对象实例íS
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一样。其运行结果如下图所示:íS
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íS
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íS
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íS
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íS
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看明白了这段代码之后,再看另两个JSON类的使用方法就简单多了。其DEMO代码如下:íS
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íS
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private void GetUserToJsonObject_Click(object sender, RoutedEventArgs e)íS
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{íS
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Uri serviceUri = new Uri("íS
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http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUserListByAge/2");íS
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WebClient webClient_JsonObject = new WebClient();íS
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webClient_JsonObject.OpenReadCompleted += íS
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new OpenReadCompletedEventHandler(webClient_JsonObject_OpenReadCompleted);íS
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webClient_JsonObject.OpenReadAsync(serviceUri);íS
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}íS
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íS
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void webClient_JsonObject_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)íS
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{íS
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JsonObject jsonObject = (JsonObject) JsonObject.Load(e.Result);//e.Result为JSON流数据íS
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//下面获取JSON对象实例中的数据íS
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UserList.Items.Add(string.Format("Name:{0}, Address:{1}, Age:{2}, IsMember:{3} ",íS
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jsonObject["Name"],íS
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jsonObject["Address"],íS
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jsonObject["Age"],íS
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jsonObject["IsMember"])); íS
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}íS
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íS
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其运行结果如下所示:íS
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íS
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íS
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íS
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íS
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最后再看一下JsonArray, 这个类可以看成是JsonObject的一个集合,它支持LINQ查询,其DEMO代码如下:íS
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íS
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private void GetUserToJsonArray_Click(object sender, RoutedEventArgs e)íS
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{íS
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Uri serviceUri = new Uri("http://localhost:1514/Json_SilverlightWeb/UserService.svc/GetUserList");íS
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WebClient webClient_JsonArray = new WebClient();íS
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webClient_JsonArray.OpenReadCompleted += íS
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new OpenReadCompletedEventHandler(webClient_JsonArray_OpenReadCompleted);íS
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webClient_JsonArray.OpenReadAsync(serviceUri);íS
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}íS
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íS
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void webClient_JsonArray_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)íS
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{íS
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JsonArray users = (JsonArray)JsonArray.Load(e.Result);//e.Result为JSON流数据íS
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var userlist = from user in usersíS
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where user["Age"] > 2íS
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select user;íS
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íS
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foreach (JsonObject jsonObject in userlist)íS
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{íS
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UserList.Items.Add(string.Format("Name:{0}, Address:{1}, Age:{2}, IsMember:{3} ",íS
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jsonObject["Name"],íS
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jsonObject["Address"],íS
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jsonObject["Age"],íS
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jsonObject["IsMember"])); íS
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}íS
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}íS
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运行结果如下图所示:íS
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íS
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íS
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当然在JSON名空间下还有许多不错的类,如果大家有兴趣,我会在以后进行介绍:) íS
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íS
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£Hª;www.netcsharp.cnÅÑà×AŰi附件:
silverlight_json.rar