使用 JavaScriptSerializer() 反序列化 JSON 文件

发布于 2024-10-29 22:19:20 字数 1313 浏览 6 评论 0原文

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,其中包含文件名作为 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"
}

它有子属性和值。我如何在我的响应类中命名它们。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?

the json file's structure which I will deserialize looks like below;

{
    "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"
    }
}

I have created a class which has the filed names as properties for JavaScriptSerializer. The code which I will use to Deserialize the json is as follows;

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


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

            }

My problem is how I can read the user field on json file. which is like below;

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

it has sub properties and values. how can I name them on my Response class. my response class now look like this;

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; }

}

what is the best case to do it?

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评论(6

只想待在家 2024-11-05 22:19:20
  1. 您需要创建一个保存用户值的类,就像响应类User一样。
  2. 向响应类“user”添加一个属性,其类型为用户值User的新类的类型。

    公共类响应 {
    
        公共字符串 ID { 获取;放; }
        公共字符串文本{获取;放; }
        公共字符串 url { 获取;放; }
        公共字符串宽度{获取;放; }
        公共字符串高度{获取;放; }
        公共字符串大小{获取;放; }
        公共字符串类型{获取;放; }
        公共字符串时间戳{获取;放; }
        公共用户用户{获取;放; }
    
    }
    
    公共类用户{
    
        公共 int id { 得到;放; }
        公共字符串屏幕名称{获取;放; }
    
    }
    

一般来说,您应该确保 json 的属性类型与您的 CLR 类匹配。 您尝试反序列化的结构似乎包含多个数值(很可能是 int< /代码>)。我不确定 JavaScriptSerializer 是否能够自动将数字反序列化为字符串字段,但无论如何,您都应该尝试将 CLR 类型与实际数据尽可能匹配。

  1. You need to create a class that holds the user values, just like the response class User.
  2. Add a property to the Response class 'user' with the type of the new class for the user values 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; }
    
    }
    

In general you should make sure the property types of the json and your CLR classes match up. It seems that the structure that you're trying to deserialize contains multiple number values (most likely int). I'm not sure if the JavaScriptSerializer is able to deserialize numbers into string fields automatically, but you should try to match your CLR type as close to the actual data as possible anyway.

千と千尋 2024-11-05 22:19:20

假设您不想创建另一个类,您始终可以让反序列化器为您提供一个键值对字典,如下所示:

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

您将返回一些内容,您可以在其中执行以下操作:

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

查看 result< /code> 在调试器中查看其中有什么。

Assuming you don't want to create another class, you can always let the deserializer give you a dictionary of key-value-pairs, like so:

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

You'll get back something, where you can do:

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

Look at result in the debugger to see, what's in there.

寂寞陪衬 2024-11-05 22:19:20

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:
此代码应该适用于 1 级的 JSON

Samplejson.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 %>

以及 2 级的 JSON:

sample2.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 %>

For .Net 4+:

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

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

For .Net 2/3.5:
This code should work on JSON with 1 level

samplejson.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 %>

And for a 2 level JSON:

sample2.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 %>
木槿暧夏七纪年 2024-11-05 22:19:20

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; }
}

Create a sub-class User with an id field and screen_name field, like this:

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; }
}
陌上青苔 2024-11-05 22:19:20
  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);
  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);
//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; }
}
//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; }
}
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