37

我将反序列化的 json 文件的结构如下所示；

{
    "id" : "1lad07",
    "text" : "test",
    "url" : "http:\/\/twitpic.com\/1lacuz",
    "width" : 220,
    "height" : 84,
    "size" : 8722,
    "type" : "png",
    "timestamp" : "Wed, 05 May 2010 16:11:48 +0000",
    "user" : {
        "id" : 12345,
        "screen_name" : "twitpicuser"
    }
}

我创建了一个类，该类将文件名作为 JavaScriptSerializer 的属性。我将用来反序列化 json 的代码如下；

            using (var reader = new StreamReader(twitpicResponse.GetResponseStream())) {


                var responseBody = reader.ReadToEnd();
                var deserializer = new JavaScriptSerializer();
                var results = deserializer.Deserialize<Response>(responseBody);

            }

我的问题是如何读取 json 文件上的用户字段。如下所示；

"user" : {
    "id" : 12345,
    "screen_name" : "twitpicuser"
}

它具有子属性和值。我如何在我的 Response 课程中命名它们。我的响应类现在看起来像这样；

public class Response {

    public string id { get; set; }
    public string text { get; set; }
    public string url { get; set; }
    public string width { get; set; }
    public string height { get; set; }
    public string size { get; set; }
    public string type { get; set; }
    public string timestamp { get; set; }

}

最好的情况是什么？

4

6 回答 6

39
  1. 您需要创建一个包含用户值的类，就像响应类一样User。

  2. 使用用户值的新类的类型将属性添加到响应类“用户” User。

    public class Response {

    public string id { get; set; }
    public string text { get; set; }
    public string url { get; set; }
    public string width { get; set; }
    public string height { get; set; }
    public string size { get; set; }
    public string type { get; set; }
    public string timestamp { get; set; }
    public User user { get; set; }

}

public class User {

    public int id { get; set; }
    public string screen_name { get; set; }

}

一般来说，您应该确保 json 的属性类型和您的 CLR 类匹配。您尝试反序列化的结构似乎包含多个数值（很可能int）。我不确定是否JavaScriptSerializer能够自动将数字反序列化为字符串字段，但无论如何您都应该尝试使 CLR 类型尽可能接近实际数据。

于 2011-03-31T15:25:50.390 回答
20

假设您不想创建另一个类，您总是可以让反序列化器为您提供键值对字典，如下所示：

string s = //{ "user" : {    "id" : 12345,    "screen_name" : "twitpicuser"}};
var serializer = new JavaScriptSerializer();
var result = serializer.DeserializeObject(s);

你会得到一些东西，你可以在哪里做：

var userId = int.Parse(result["user"]["id"]); // or (int)result["user"]["id"] depending on how the JSON is serialized.
// etc.

在调试器中查看，看看result里面有什么。

于 2011-03-31T15:28:00.230 回答
10

对于.Net 4+：

string s = "{ \"user\" : {    \"id\" : 12345,    \"screen_name\" : \"twitpicuser\"}}";

var serializer = new JavaScriptSerializer();
dynamic usr = serializer.DeserializeObject(s);
var UserId = usr["user"]["id"];

对于 .Net 2/3.5：此代码应适用于 1 级的 JSON

示例json.aspx

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Globalization" %>
<%@ Import Namespace="System.Web.Script.Serialization" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%
string s = "{ \"id\" : 12345,    \"screen_name\" : \"twitpicuser\"}";
var serializer = new JavaScriptSerializer();
Dictionary<string, object> result = (serializer.DeserializeObject(s) as Dictionary<string, object>);
var UserId = result["id"];
 %>
 <%=UserId %>

对于 2 级 JSON：

样本2.aspx

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Globalization" %>
<%@ Import Namespace="System.Web.Script.Serialization" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%
string s = "{ \"user\" : {    \"id\" : 12345,    \"screen_name\" : \"twitpicuser\"}}";
var serializer = new JavaScriptSerializer();
Dictionary<string, object> result = (serializer.DeserializeObject(s) as Dictionary<string, object>);
Dictionary<string, object> usr = (result["user"] as Dictionary<string, object>);
var UserId = usr["id"];
 %>
 <%= UserId %>
于 2015-07-08T00:35:29.713 回答
3

创建一个带有 id 字段和 screen_name 字段的子类 User，如下所示：

public class User
{
    public string id { get; set; }
    public string screen_name { get; set; }
}

public class Response {

    public string id { get; set; }
    public string text { get; set; }
    public string url { get; set; }
    public string width { get; set; }
    public string height { get; set; }
    public string size { get; set; }
    public string type { get; set; }
    public string timestamp { get; set; }
    public User user { get; set; }
}
于 2011-03-31T15:27:56.940 回答
3 
  public class User : List<UserData>
    {

        public int id { get; set; }
        public string screen_name { get; set; }

    }


    string json = client.DownloadString(url);
    JavaScriptSerializer serializer = new JavaScriptSerializer();
    var Data = serializer.Deserialize<List<UserData>>(json);
于 2013-10-30T04:32:55.203 回答
1 
//Page load starts here

var json = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(new
{
    api_key = "my key",
    action = "categories",
    store_id = "my store"
});

var json2 = "{\"api_key\":\"my key\",\"action\":\"categories\",\"store_id\":\"my store\",\"user\" : {\"id\" : 12345,\"screen_name\" : \"twitpicuser\"}}";
var list = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<FooBar>(json);
var list2 = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<FooBar>(json2);

string a = list2.action;
var b = list2.user;
string c = b.screen_name;

//Page load ends here

public class FooBar
{
    public string api_key { get; set; }
    public string action { get; set; }
    public string store_id { get; set; }
    public User user { get; set; }
}

public class User
{
    public int id { get; set; }
    public string screen_name { get; set; }
}
于 2015-08-27T15:03:30.817 回答