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近来在研究JQuery,用$.ajax在与后台交换数据时用到Json格式,后台与前台序列化和反序列化方法研究了很久才成功,发文共享.
前台调用的JS文件需要用到JQuery-1.2.6.js和json2.js,后台引用空间System.Runtime.Serialization和System.Runtime.Serialization.Json
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;
}
/// 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; }
}
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);
}
});
});
$.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}
{
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 },
dataType: 'json',
timeout: 1000,
error: function(XMLHttpRequest, textStatus, errorThrown) { alert(textStatus) },
success: function(result) {
alert(result.success);
}
});
});
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 },
dataType: 'json',
timeout: 1000,
error: function(XMLHttpRequest, textStatus, errorThrown) { alert(textStatus) },
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;
}
}
}
{
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.PS:小学语文没学好,让各位见笑.
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