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在C#中反序列化JSON数组（或列表）

c#asp.netajaxjsonserialization
22

以下是基本代码：

public static string DeserializeNames()
{

    jsonData = "{\"name\":[{\"last\":\"Smith\"},{\"last\":\"Doe\"}]}";

    JavaScriptSerializer ser = new JavaScriptSerializer();

    nameList myNames = ser.Deserialize<nameList>(jsonData);

    return ser.Serialize(myNames);
}

//Class descriptions

public class name
{

   public string last { get; set; }

}

public class nameList
{

   public List<name> { get; set; }

}

我尝试过：

nameList myNames = ser.Deserialize<nameList>(jsonData);

并且：

List<name> myNames = ser.Deserialize<List<name>>(jsonData);

两个都不起作用。有人有什么想法吗？

1
你说“都不行”，但你能更具体一些吗？你是否遇到了异常？空结果？甚至无法编译？你的nameList类是无效的（我假设属性实际上是public List<name> name { get; set; }）。 - Jacob
我从两个地方都得到了空结果。你关于属性的说法是正确的...我忘记了第二个“name”。谢谢你的回复。 - sadermine
1
我刚刚运行了你的代码（修复了属性并在“jsonData”之前加上了“var”），它对我起作用了。你的代码肯定还有其他问题导致它不能正常工作。 - Jacob
1
我刚刚弄清楚了问题所在。你假设的属性应该被称为“name”（来自你的第一条评论），实际上被称为“names”。我将其更改为“name”，然后它就完美地工作了。我没有意识到C#对象中属性的名称必须与JSON中属性的名称完全匹配。我以为它是按照对象的结构来进行的。感谢你指出这一点给我。 - sadermine
3个回答
20

这段代码对我有效：

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

namespace Json
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(DeserializeNames());
            Console.ReadLine();
        }

        public static string DeserializeNames()
        {
            var jsonData = "{\"name\":[{\"last\":\"Smith\"},{\"last\":\"Doe\"}]}";

            JavaScriptSerializer ser = new JavaScriptSerializer();

            nameList myNames = ser.Deserialize<nameList>(jsonData);

            return ser.Serialize(myNames);
        }

        //Class descriptions

        public class name
        {
            public string last { get; set; }
        }

        public class nameList
        {
            public List<name> name { get; set; }
        }
    }
}
2
啊，非常好的答案。我使用了DeseriliseObject并将其强制转换为列表- 这立即起作用。谢谢 :) +1 - Piotr Kula
1
很好的答案，但如果还有另一层呢？ - Djeroen
我有一个List<T>，它在JSON字符串中有几层，JavaScriptSerializer无法反序列化，也无法正确反序列化十进制/双精度数字。使用Dasith Wijes的答案中的JsonConvert对我有用，包括使用此答案遗漏的数字。 - computercarguy
7
从这里下载Json.NET。
name deserializedName = JsonConvert.DeserializeObject<name>(jsonData);
1
JavaScriptSerializer 应该可以工作；这个是否提供比它更多的好处？ - Jacob
“引用”50%比DataContractJsonSerializer更快，比JavaScriptSerializer快250%。”
  1. http://james.newtonking.com/archive/2010/01/01/net-serialization-performance-comparison
  2. http://devenva.blogspot.com.au/2014/08/jsonnet-vs-javascriptserializer.html
 - Dasith Wijes
1
这适用于一个相当深层嵌套的JSON对象，其中包括一个嵌套的List<T>。 - computercarguy
4

我曾经遇到类似的问题，并通过理解asp.net C#中的类来解决。

我想读取以下JSON字符串：

[
    {
        "resultList": [
            {
                "channelType": "",
                "duration": "2:29:30",
                "episodeno": 0,
                "genre": "Drama",
                "genreList": [
                    "Drama"
                ],
                "genres": [
                    {
                        "personName": "Drama"
                    }
                ],
                "id": 1204,
                "language": "Hindi",
                "name": "The Great Target",
                "productId": 1204,
                "productMasterId": 1203,
                "productMasterName": "The Great Target",
                "productName": "The Great Target",
                "productTypeId": 1,
                "productTypeName": "Movie",
                "rating": 3,
                "releaseyear": "2005",
                "showGoodName": "Movies ",
                "views": 8333
            },
            {
                "channelType": "",
                "duration": "2:30:30",
                "episodeno": 0,
                "genre": "Romance",
                "genreList": [
                    "Romance"
                ],
                "genres": [
                    {
                        "personName": "Romance"
                    }
                ],
                "id": 1144,
                "language": "Hindi",
                "name": "Mere Sapnon Ki Rani",
                "productId": 1144,
                "productMasterId": 1143,
                "productMasterName": "Mere Sapnon Ki Rani",
                "productName": "Mere Sapnon Ki Rani",
                "productTypeId": 1,
                "productTypeName": "Movie",
                "rating": 3,
                "releaseyear": "1997",
                "showGoodName": "Movies ",
                "views": 6482
            },
            {
                "channelType": "",
                "duration": "2:34:07",
                "episodeno": 0,
                "genre": "Drama",
                "genreList": [
                    "Drama"
                ],
                "genres": [
                    {
                        "personName": "Drama"
                    }
                ],
                "id": 1520,
                "language": "Telugu",
                "name": "Satyameva Jayathe",
                "productId": 1520,
                "productMasterId": 1519,
                "productMasterName": "Satyameva Jayathe",
                "productName": "Satyameva Jayathe",
                "productTypeId": 1,
                "productTypeName": "Movie",
                "rating": 3,
                "releaseyear": "2004",
                "showGoodName": "Movies ",
                "views": 9910
            }
        ],
        "resultSize": 1171,
        "pageIndex": "1"
    }
]

我的asp.net c#代码如下所示：

首先，在Web应用程序的APP_Code文件夹中创建了Class3.cs页面。

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using System.Text;
using System.IO;
using System.Web.Script.Serialization;
using System.Collections.Generic;

/// <summary>
/// Summary description for Class3
/// </summary>
public class Class3
{

    public List<ListWrapper_Main> ResultList_Main { get; set; }

    public class ListWrapper_Main
    {
        public List<ListWrapper> ResultList { get; set; }

        public string resultSize { get; set; }
        public string pageIndex { get; set; }
    }

    public class ListWrapper
    {
        public string channelType { get; set; }
        public string duration { get; set; }
        public int episodeno { get; set; }
        public string genre { get; set; }
        public string[] genreList { get; set; }
        public List<genres_cls> genres { get; set; }
        public int id { get; set; }
        public string imageUrl { get; set; }
        //public string imageurl { get; set; }
        public string language { get; set; }
        public string name { get; set; }
        public int productId { get; set; }
        public int productMasterId { get; set; }
        public string productMasterName { get; set; }
        public string productName { get; set; }
        public int productTypeId { get; set; }
        public string productTypeName { get; set; }
        public decimal rating { get; set; }
        public string releaseYear { get; set; }
        //public string releaseyear { get; set; }
        public string showGoodName { get; set; }
        public string views { get; set; }
    }
    public class genres_cls
    {
        public string personName { get; set; }
    }

}

接下来，浏览器页面读取上述字符串/JSON字符串，并显示/反序列化JSON对象并显示数据。

JavaScriptSerializer ser = new JavaScriptSerializer();


        string final_sb = sb.ToString();

        List<Class3.ListWrapper_Main> movieInfos = ser.Deserialize<List<Class3.ListWrapper_Main>>(final_sb.ToString());

        foreach (var itemdetail in movieInfos)
        {

            foreach (var itemdetail2 in itemdetail.ResultList)
            {
                Response.Write("channelType=" + itemdetail2.channelType + "<br/>");
                Response.Write("duration=" + itemdetail2.duration + "<br/>");
                Response.Write("episodeno=" + itemdetail2.episodeno + "<br/>");
                Response.Write("genre=" + itemdetail2.genre + "<br/>");

                string[] genreList_arr = itemdetail2.genreList;
                for (int i = 0; i < genreList_arr.Length; i++)
                    Response.Write("genreList1=" + genreList_arr[i].ToString() + "<br>");

                foreach (var genres1 in itemdetail2.genres)
                {
                    Response.Write("genres1=" + genres1.personName + "<br>");
                }

                Response.Write("id=" + itemdetail2.id + "<br/>");
                Response.Write("imageUrl=" + itemdetail2.imageUrl + "<br/>");
                //Response.Write("imageurl=" + itemdetail2.imageurl + "<br/>");
                Response.Write("language=" + itemdetail2.language + "<br/>");
                Response.Write("name=" + itemdetail2.name + "<br/>");
                Response.Write("productId=" + itemdetail2.productId + "<br/>");
                Response.Write("productMasterId=" + itemdetail2.productMasterId + "<br/>");
                Response.Write("productMasterName=" + itemdetail2.productMasterName + "<br/>");
                Response.Write("productName=" + itemdetail2.productName + "<br/>");
                Response.Write("productTypeId=" + itemdetail2.productTypeId + "<br/>");
                Response.Write("productTypeName=" + itemdetail2.productTypeName + "<br/>");
                Response.Write("rating=" + itemdetail2.rating + "<br/>");
                Response.Write("releaseYear=" + itemdetail2.releaseYear + "<br/>");
                //Response.Write("releaseyear=" + itemdetail2.releaseyear + "<br/>");
                Response.Write("showGoodName=" + itemdetail2.showGoodName + "<br/>");
                Response.Write("views=" + itemdetail2.views + "<br/><br>");
                //Response.Write("resultSize" + itemdetail2.resultSize + "<br/>");
                //  Response.Write("pageIndex" + itemdetail2.pageIndex + "<br/>");


            }



            Response.Write("resultSize=" + itemdetail.resultSize + "<br/><br>");
            Response.Write("pageIndex=" + itemdetail.pageIndex + "<br/><br>");

        }

'sb'实际上是一个字符串，即本回复顶部提到的JSON数据字符串。
这基本上是一个web应用程序asp.net c#代码...
祝愉快...
谢谢，这正是我在寻找的。 - Photonic
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