SilverLight学习笔记--Silverligh之Json的通讯传递
还是原文看的比较清楚。http://www.cnblogs.com/wsdj-ITtech/archive/2009/08/27/1554787.html
JSON是一种轻量级的数据传输类型,它可以通过序列化把一个简单对象转换为一个简单的字符串,在网络中进行传输,然后在客户端进行反序列化,得到原始对象.功能上和XML差不多,只是它的体积小,在客户端解析方便,所以被广泛使用.
我们可以使用Silverlight提供的三个类来完成JSON数据的传递和接收。它们是：
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1
、DataContractJsonSerializer （位于 System.Runtime.Serialization.Json）
2 、JsonObject （位于System.Json，将JSON数据流转换成为可读写的对象）
3 、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）
2 、JsonObject （位于System.Json，将JSON数据流转换成为可读写的对象）
3 、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）
注： 如果要引用System.Runtime.Serialization.Json名空间里的Json,则必须也引用System.ServiceModel,否则Json会无法使用。在本例中，我们将使用它来进行示例。
下面我们一起来学习在Silverlight中如何从服务器端向客户端传递Json数据。
新建一个Silverlight应用程序。命名为:SLJson
（一）准备工作
在这里，我们完成三种情况的Json数据传递。
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1
、一个Person类(其属性均为简单类型:String类型)
2 、Customers类，它是Person类的一个List。
3 、一个PersonT类(它包含另一个类 Address)
2 、Customers类，它是Person类的一个List。
3 、一个PersonT类(它包含另一个类 Address)
我们要传递这三种情况的类对象实例到客户端并显示出来。
所以，在此，我们首先要在服务器端和客户端分别建立上面的三个类。
Person类
服务器端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization; // 要引用System.Runtime.Serialization.Dll才能使用[DataContract]与[DataMember]属性
namespace SLJson.Web
{
[DataContract]
public class Person
{
[DataMember]
public string Name { get ; set ; }
[DataMember]
public int Age { get ; set ; }
[DataMember]
public string Address { get ; set ; }
}
}
客户端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SLJson
{
public class Person
{
public string Name { get ; set ; }
public int Age { get ; set ; }
public string Address { get ; set ; }
}
}
Customers类
服务器端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization; // 要引用System.Runtime.Serialization.Dll才能使用[DataContract]与[DataMember]属性
namespace SLJson.Web
{
[DataContract]
public class Customers
{
[DataMember]
public List < Person > Persons { get ; set ; }
}
}
客户端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections.Generic; // 要引入此空间以使用List
namespace SLJson
{
public class Customers
{
public List < Person > Persons { get ; set ; }
}
}
PersonT类
服务器端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization; // 要引用System.Runtime.Serialization.Dll才能使用[DataContract]与[DataMember]属性
namespace SLJson.Web
{
[DataContract]
public class PersonT
{
[DataMember]
public string Name { get ; set ; }
[DataMember]
public int Age { get ; set ; }
[DataMember]
public Address Address { get ; set ; }
}
}
客户端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SLJson
{
public class PersonT
{
public string Name { get ; set ; }
public int Age { get ; set ; }
public Address Address { get ; set ; }
}
}
PersonT类内含的Address类
服务器端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization; // 要引用System.Runtime.Serialization.Dll才能使用[DataContract]与[DataMember]属性
namespace SLJson.Web
{
[DataContract]
public class Address
{
[DataMember]
public string country { get ; set ; }
[DataMember]
public string city { get ; set ; }
}
}
客户端代码定义如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SLJson
{
public class Address
{
public string country { get ; set ; }
public string city { get ; set ; }
}
}
至此，我们的应用程序如下图:
(二) 实现Json数据的传递。
1、建立用户界面
Page.xaml代码如下:
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<
UserControl x:Class
=
"
SLJson.Page
"
xmlns = " http://schemas.microsoft.com/winfx/2006/xaml/presentation "
xmlns:x = " http://schemas.microsoft.com/winfx/2006/xaml "
Width = " 400 " Height = " 400 " >
< StackPanel Width = " 400 " Height = " 400 " Background = " Wheat " >
< TextBlock Text = " 获取的数据如下 " TextAlignment = " Center " Foreground = " Red " Margin = " 2 " FontSize = " 16 " ></ TextBlock >
< ListBox x:Name = " lstReturn " Width = " 350 " Height = " 220 " Margin = " 6 " ></ ListBox >
< Button x:Name = " btnGetPerson " Width = " 200 " Height = " 25 " Content = " 获取Person类数据 " Margin = " 8 " Click = " btnGetPerson_Click " ></ Button >
< Button x:Name = " btnGetPersonT " Width = " 200 " Height = " 25 " Content = " 获取PersonT类数据 " Margin = " 8 " Click = " btnGetPersonT_Click " ></ Button >
< Button x:Name = " btnGetCustomer " Width = " 200 " Height = " 25 " Content = " 获取Customer类数据 " Margin = " 8 " Click = " btnGetCustomer_Click " ></ Button >
</ StackPanel >
</ UserControl >
xmlns = " http://schemas.microsoft.com/winfx/2006/xaml/presentation "
xmlns:x = " http://schemas.microsoft.com/winfx/2006/xaml "
Width = " 400 " Height = " 400 " >
< StackPanel Width = " 400 " Height = " 400 " Background = " Wheat " >
< TextBlock Text = " 获取的数据如下 " TextAlignment = " Center " Foreground = " Red " Margin = " 2 " FontSize = " 16 " ></ TextBlock >
< ListBox x:Name = " lstReturn " Width = " 350 " Height = " 220 " Margin = " 6 " ></ ListBox >
< Button x:Name = " btnGetPerson " Width = " 200 " Height = " 25 " Content = " 获取Person类数据 " Margin = " 8 " Click = " btnGetPerson_Click " ></ Button >
< Button x:Name = " btnGetPersonT " Width = " 200 " Height = " 25 " Content = " 获取PersonT类数据 " Margin = " 8 " Click = " btnGetPersonT_Click " ></ Button >
< Button x:Name = " btnGetCustomer " Width = " 200 " Height = " 25 " Content = " 获取Customer类数据 " Margin = " 8 " Click = " btnGetCustomer_Click " ></ Button >
</ StackPanel >
</ UserControl >
用户界面如下图:
2、服务器端：我们新建一个Handler(在本例命名为:CustomerJsonHandler.ashx)专门负责响应客户端发来的请求，在服务器端生成Json格式的结果数据并返回给客户端。
2.1、生成将要传递的类对象实例
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获取需要返回的数据Person 
}
获取需要返回的数据Customers(Person类数组) 获取需要返回的数据PersonT(其属性Address是另一个类Address)
2.2、并把它们序列化成Json格式的数据
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --> // 定义一个字符串存放序列化后的结果
string strJSON = "" ;
switch (retType)
{
// 返回Person类
case " Person " : strJSON = SerializeToJsonString(GetRetDataPerson()); break ;
// 返回PersonT类
case " PersonT " : strJSON = SerializeToJsonString(GetRetDataPersonT()); break ;
// 返回Person类数组Customer
case " Customer " : strJSON = ToJson < Customers > (GetRetDataCustomers()); break ;
}
2.3、向客户端传递
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->
context.Response.ContentType
=
"
text/plain
"
;
context.Response.Write(strJSON);
context.Response.Write(strJSON);
服务器端CustomerJsonHandler.ashx全部代码如下:
<!-- <br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.IO; using System.Text; using System.Runtime.Serialization.Json; // 需要引用 System.ServiceModel.DLL
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