本文共 4179 字,大约阅读时间需要 13 分钟。
一, 方法1
Json.net实现方便的Json转C#(dynamic动态类型)对象 以前需要将一段json字符串转换为C#对象时,一般都是定义一个与之对应的实体类来接收。这样做有一个很大的缺点,就是当字符串特别长,属性特别多,又有嵌套时,手敲这个实体类就非常痛苦。C# 4.0 之后有了动态类型dynamic。用这个东西配合Json.net可以实现不用定义实体类的json转dynamic类型对象。
以下示例需要先引用Newtonsoft.Json.dllpublic class Person { public int Id { get; set; } public string Name { get; set; }} class Program{ static void Main(string[] args) { Person p = new Person(); p.Id = 1; p.Name = "刘备"; //C#对象转Json string json = JsonConvert.SerializeObject(p); Console.WriteLine(json); //{"Id":1,"Name":"刘备"} //此处模拟在不建实体类的情况下,反转将json返回dynamic对象 var DynamicObject = JsonConvert.DeserializeObject(json); Console.WriteLine(DynamicObject.Name); //刘备 Console.ReadKey(); }}
以上只是借用了一个实体类来获得一个简单的JSON对象。
实际上,可以完全没有这个Person类。static void Main(string[] args){ string json = "{\"Id\":1,\"Name\":\"刘备\",\"Age\":\"22\"}"; //此处模拟在不建实体类的情况下,反转将json返回回dynamic对象 var DynamicObject = JsonConvert.DeserializeObject(json); Console.WriteLine(DynamicObject.Name); //刘备 Console.ReadKey();}
如果未引用Microsoft.CSharp.dll,关于动态类型,VS可能会报错。
VS 可以回编译报错:找不到编译动态表达式所需的一个或多个类型。是否缺少引用?二, 方法2
利用System.Web.Helpers, 注:需要引入 System.Web.Helpers.dll. 例子:1. 参数:jsonStr{ "log_id": 620759800, "words_result": [ { "location": { "left": 56, "top": 0, "width": 21, "height": 210 }, "words": "3" } ], "words_result_num": 1}2.函数 //use linq to get the max number from the return json format string public string GetMaxNumber(string jsonStr) { try { dynamic data = System.Web.Helpers.Json.Decode(jsonStr);//convert json string to dynamic object. need add reference of "System.Web.Helpers.dll" , 对应的是 Json.Encode() var result = (from i in (IEnumerable)data.words_result select new { num = int.Parse(i.words) }).Max(c => c.num); return Convert.ToString(result); } catch (Exception e) { return ""; } }
三.方法3
JavaScriptSerializer.Serialize 方法 定義 命名空間: System.Web.Script.Serialization 組件: System.Web.Extensions.dll 適用於 .NET Framework 4.8 及其他版本 参考: https://docs.microsoft.com/zh-tw/dotnet/api/system.web.script.serialization?view=netframework-4.8using System;using System.Collections.Generic;using System.Web.UI;using System.Web.Script.Serialization;namespace ExampleApplication{ public partial class _Default : Page { protected void Page_Load(object sender, EventArgs e) { var RegisteredUsers = new List(); RegisteredUsers.Add(new Person() { PersonID = 1, Name = "Bryon Hetrick", Registered = true }); RegisteredUsers.Add(new Person() { PersonID = 2, Name = "Nicole Wilcox", Registered = true }); RegisteredUsers.Add(new Person() { PersonID = 3, Name = "Adrian Martinson", Registered = false }); RegisteredUsers.Add(new Person() { PersonID = 4, Name = "Nora Osborn", Registered = false }); var serializer = new JavaScriptSerializer(); var serializedResult = serializer.Serialize(RegisteredUsers); // Produces string value of: // [ // {"PersonID":1,"Name":"Bryon Hetrick","Registered":true}, // {"PersonID":2,"Name":"Nicole Wilcox","Registered":true}, // {"PersonID":3,"Name":"Adrian Martinson","Registered":false}, // {"PersonID":4,"Name":"Nora Osborn","Registered":false} // ] var deserializedResult = serializer.Deserialize
>(serializedResult); // Produces List with 4 Person objects } } public class Person { public int PersonID { get; set; } public string Name { get; set; } public bool Registered { get; set; } }}
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