C#将json字符串解析成对象

雨点打透心脏的1/2处 2022-03-31 02:46 1115阅读 0赞

首先我们在客户端生成json字符串,通过ajax把该字符串传到服务器端

//这是一个以id，email，age的json字符串

var jdata="\[\{\\"id\\":0,\\"email\\":\\"abccd\\",\\"age\\":0\},\{\\"id\\":1,\\"email\\":\\"abc1\\",\\"age\\":2\}\]";

//将这个json字符串，传递到PaperMark.ashx侧处理

$.post("AJAX/PaperMark.ashx", \{  
                            jdata: jdata  
                            
                        \}, function(data, textStatus) \{

\});

在PaperMark.ashx我们要引用下面的命名空间

using System.Web.Script.Serialization;  
using System.Collections.Generic;

string jsonData = context.Request.Form\["jdata"\];  //取得这个json字符串

//做一个类id，email，age和json格式一致

public class Person  
    \{  
        public int id \{ set; get; \}  
        public String email \{ set; get; \}  
        public int age \{ set; get; \}  
    \}

//这个一个反序列化的方法，用于返回泛型集合

public static T JSONToObject<T>(string jsonText)  
    \{  
        JavaScriptSerializer jss = new JavaScriptSerializer();  
        return jss.Deserialize<T>(jsonText);  
    \}

//调用上面这个方法，把json字符串传进去，就得到一个对象集合了

List<Person> DataReust = JSONToObject<List<Person>>(jsonData);

for (int i = 0; i < DataReust.Count; i++)  
        \{  
            string j = DataReust\[i\].email;  
        \}

注意点：

json字符串的构造一定要正确。要不然解析不出来。

为了在js端更为方便的构造出正确的json对象,我做了一些函数用于生成json字符串

var jstr = "";  
              var jsData = "\[";   //这个就是最后生成的json字符串  
              
              function AddJsonItemStart() \{  
                  jstr = "";  
              \}

//vtype==int的时候不加引号

function AddJsonItem(name, val, vtype) \{

if (jstr == "") \{  
                      //为整型的情况下面  
                      if (vtype == "int") \{  
                          jstr = "\{\\"" + name + "\\":" + val + ",";  
                      \}  
                      else \{  
                          //为字符串的情况下面  
                          jstr = "\{\\"" + name + "\\":\\"" + val + "\\",";  
                      \}

\}  
                  else \{  
                      if (vtype == "int") \{  
                          jstr = jstr + "\\"" + name + "\\":" + val + ",";  
                      \}  
                      else \{  
                          jstr = jstr + "\\"" + name + "\\":\\"" + val + "\\",";  
                      \}

\}  
              \}

function AddJsonItemOK() \{  
                  jstr = jstr.substring(0, jstr.length - 1) + "\},";  
                  jsData = jsData + jstr;  
              \}

function AddJsonEnd() \{  
                  jsData = jsData.substring(0, jsData.length - 1) + "\]";  
              \}

使用方法:

AddJsonItemStart();  
                  AddJsonItem("id", 1, "int");  
                  AddJsonItem("email", "abc", "string");  
                  AddJsonItem("age", 5, "int");  
                  AddJsonItemOK();

AddJsonItemStart();  
                  AddJsonItem("id", 2, "int");  
                  AddJsonItem("email", "cef", "string");  
                  AddJsonItem("age", 6, "int");  
                  AddJsonItemOK();  
                  AddJsonEnd();