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Json序列化和反序列化方法解析

2019年03月20日  | 移动技术网IT编程  | 我要评论

代码如下:


 /// <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

. 代码如下:


    [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

. 代码如下:


$('#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

. 代码如下:


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

. 代码如下:


           $('#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);
                    }

                });
});


c#后台生成代码

. 代码如下:


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。

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