A brief introduction to C#.NET, JavaScript and JSON (graphics and text)-C#.Net Tutorial-php.cn

A brief introduction to C#.NET, JavaScript and JSON (graphics and text)

黄舟

Release： 2017-03-23 11:49:29

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This article introduces C#.NET, JavaScript and # The relevant knowledge of ##JSON has a very good reference value. Let’s take a look at it with the editor.

Written in front

All typed by hand, If there is no unnecessary information, I will record all the basic information.

1. What is JSON

JSON: JavaScript

Object Notation is a lightweight data interaction format, mainly used for data transmission

2. JSON syntax rules

1. Data consists of key-value pairs ( Mapping) relationship representation, use ":" to represent;

Example: "name" : "Zhao Da".

2. Use "," to separate the data;

Example: "name" : "Zhao Da", "age" : "27".

3. The data mapping collection (object) is included with "{}";

Example: A student data object:

　{"id" : "1", "name" : "Zhao Da", "age" : "27", "gender" : "Male"}

4. The collection of parallel data (array form of objects) is included with "[]" and separated by ",";

Example: two student data object arrays:

　[ {"id" : "1", "name" : "Zhao Da", "age" : "27", "gender" : "Male"}, {"id" : "2", "name" : "Qian 2", "age" : "27", "gender" : "Male"}]

3. Data type in JSON data

Number (integer or floating point number)
String (in double quotes)
Boolean value ( True or False)
Array (in [])
Object (in {})
NULL

4. Data representation of JSON format data

It can be seen from the syntax rules of JSON that JSON data generally has the following Expression forms:

1. Single object;

2. Object collection (array);

3. Combination of 1 and 2: nesting;

　4. Pure string; And deserialization supported components, there are also third-party components,

.NET supports the JavaScriptSerializer class and DataContractJsonSerializer class,

Third-party support includes Json.net (newtonsoft.json) wait.

1. Use the JavaScriptSerializer class to serialize and deserialize JSON data:

First, you must quote it in the reference: System.Web. Extentions.dll

Reference in class file: using System.Web.Script.Serialization;

Dictionary<string, string> stu = new Dictionary<string, string>();
      stu.Add("id", "1");
      stu.Add("name", "赵大");
      stu.Add("age", "27");
      stu.Add("gender", "男");
      JavaScriptSerializer js = new JavaScriptSerializer();
      string stuJson = js.Serialize(stu);
      Console.WriteLine("使用 JavaScriptSerializer 类序列化得到JSON格式数据：");
      Console.WriteLine(stuJson);

示例：JSON单对象序列化

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string deJson = stuJson;
      Dictionary<string, string> deStu = js.Deserialize<Dictionary<string, string>>(deJson);
      Console.WriteLine("使用 JavaScriptSerializer 类将JSON格式数据反序列化指定类：");
      foreach (string s in stu.Keys)
      {
        Console.WriteLine(s.ToString() + "=" + stu[s].ToString());
      }
      Console.ReadLine();

示例：JSON单对象反序列化

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Run result:

##2. Use third-party supported Json.net (newtonsoft.json)

Class library

Serialize and deserialize JSON data:

6. JavaScript and JSON

1. Customize the JSON string in JavaScript and parse it;

Example: Student Zhao Da information:

function myJson() {
      var stu = { "id": "1", "name": "赵大", "age": "27", "gender": "男", "school": { "class": "03", "teacher": "赵大的老师" } };
      alert("id=" + stu.id + ", " + "name=" + stu.name + ", " + "age=" + stu.age + ", " + "gender=" + stu.gender);
    }

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Rendering:

After you can see the custom JSON string, you can automatically use the stu object Recognized as member variable

2. The JSON data passed in from the background is parsed and converted into a JSON data object:

Example: Student Zhao Da information (here The Ajax request was processed with JQuery):

$(document).ready(function () {
      $.ajax({
        url: "AjaxWeb.ashx",
        type: "GET",
        dataType: "JSON",
        success: function (data) {
          var stu = JSON.parse(data);
          alert("id=" + stu.id + ", " + "name=" + stu.name + ", " + "age=" + stu.age + ",
           " + "gender=" + stu.gender + ", " + "teacher=" + stu.school["teacher"]);
        },
        error: function (e) {
          alert(e.toString());
        }
      })
    })

从后台获取JSON字符串后转化为JSON对象

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public void ProcessRequest(HttpContext context)
    {
      context.Response.Write(myJson2());
    }
    private string myJson2()
    {
      string json = " {\"id\": \"1\", \"name\": \"赵大\", \"age\": \"27\", \"gender\": \"男\", \"school\": 
      { \"class\": \"03\", \"teacher\": \"赵大的老师\" }}";
      JavaScriptSerializer js = new JavaScriptSerializer();
      json = js.Serialize(json);
      return json;
    }

后台处理文件代码

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Rendering:

F12 developer tool debugging renderings under Chrome:

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