Net 3.5 用DataContractJsonSerializer实现Json序列和反序列例子

Json序列化和反序列化方法

/// <summary>
/// Json序列化,用于发送到客户端
/// </summary>
public static string ToJsJson(this object item)
{

DataContractJsonSerializer serializer = new DataContractJsonSerializer(item.GetType());

using (MemoryStream ms = new MemoryStream())
{

serializer.WriteObject(ms,item);

StringBuilder sb = new StringBuilder();

sb.Append(Encoding.UTF8.GetString(ms.ToArray()));

return sb.ToString();

}

}

/// <summary>
/// Json反序列化,用于接收客户端Json后生成对应的对象
/// </summary>
public static T FromJsonTo<T>(this string jsonString)
{

DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));

MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));

T jsonObject = (T)ser.ReadObject(ms);

ms.Close();

return jsonObject;

}

实体类

[DataContract]
public class TestObj
{
[DataMember]
public string make { get; set; }
[DataMember]
public string model { get; set; }
[DataMember]
public int year { get; set; }
[DataMember]
public string color { get; set; }
}--------------------------------------------javascript获取Json---------------------------------

javascript调用测试代码

$('#getJson').click(function() {
$.ajax({
url: "getJsonHandler.ashx",
type: 'GET',
data: {},
dataType: 'json',
timeout: 1000,
error: function(XMLHttpRequest,textStatus,errorThrown) { alert(textStatus) },
success: function(result) {

alert(result.make);
alert(result.model);
alert(result.year);
alert(result.color);
}

});
});C#后台生成代码

public class getJsonHandler: IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
TestObj obj = new TestObj();

obj.make = "Make is Value";
obj.model = "Model is Value";
obj.year = 999;
obj.color = "Color is Value";

context.Response.Write(obj.ToJsJson());
}
public bool IsReusable
{
get
{
return false;
}
}
}

//返回值为 {"color":"Color is Value","make":"Make is Value","model":"Model is Value","year":999}

---------------------------------C#由Json生成对象---------------------------------------

javascript调用测试代码

$('#postJson').click(function() {

var m_obj = { make: "Dodge",model: "Coronet R/T",year: 1968,color: "yellow" };
var jsonStr = JSON.stringify(m_obj); //用Json2.js生成Json字符串

$.ajax({
url: "postJsonHandler.ashx",
type: 'POST',
data: { postjson: jsonStr },
success: function(result) {

alert(result.success);
}

});
});C#后台生成代码

public class postJsonHandler: IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string jsonStr = context.Request["postjson"];

TestObj obj = jsonStr.FromJsonTo<TestObj>();

if (string.IsNullOrEmpty(obj.make) || string.IsNullOrEmpty(obj.model) || string.IsNullOrEmpty(obj.color)

|| obj.year < 0)
{
context.Response.Write("{success:false}");
}
else
{
context.Response.Write("{success:true}");
}

public bool IsReusable
{
get
{
return false;
}
}
}

使用Json时需要注意,服务器端拼凑生成Json字符串时,一定要注意把字符串用/"/"包裹,不然客户端接收时肯定会报错,根据Json字符串生成对象,是根据对应的名称赋值,多于或少于都不会报错.

（编辑：李大同）

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