通过foreach循环使用httpclient.sendasync（request）解析JSON [英] Parse JSON using httpclient.sendasync(request) via a foreach loop

问题描述

我正在使用NewtonSoft来解析JSON Api电话。



代码必须保持原样。



我唯一的问题是我无法在foreach循环中迭代JSON的值。



如何解决这个问题？

 public async任务调用WebApi（）
 {
 using（var httpClient = new HttpClient（））
 {
 using（var request = new HttpRequestMessage（new HttpMethod（GET），https://www.metaweather.com/api/location/search/?lattlong=50.068,-5.316））
 {
 var response = await httpClient.SendAsync（request）; 
 
使用（HttpContent content = response.Content）
 {
 
 
 var jsonString = await response.Content.ReadAsStringAsync（）; 
 var data = JsonConvert.DeserializeObject< Object>（jsonString）; 
 Console.WriteLine（我需要解析distance，title，location_type，woeid，latt_long以便我可以使用foreach循环遍历它）; 
 Console.WriteLine（data）; 
 Console.Read（）; 
 //我不知道如何获得json的价值
 
 
 
 
} 
} 
} 

以下是工作代码的链接：







我的尝试：



问题是我不能使用foreach循环迭代。

解决方案

你需要创建一个代表你的类在C＃中使用json对象，然后反序列化。您也可以使用visual studio来获取json，或者您也可以使用 json2csharp.com 。





json的课程是：

  public   class 位置
 {
  public  < span class =code-keyword> int  distance { get ;  set ; } 
  public   string  title { get ;  set ; } 
  public   string  location_type { get ;  set ; } 
  public   int  woeid { get ;  set ; } 
  public   string  latt_long { get ;  set ; } 
} 

当您收到多个对象即数组时，需要反序列化为上述类型的数组。

  var  data = JsonConvert.DeserializeObject< Location [] > （jsonString）; 

现在你可以迭代数组。< br $>

  foreach （ var 位置 数据）
 {
  //  你的逻辑 
} 

这是关于JSON反序列化的许多常见问题之一，所以我写了一篇文章来回答这些问题：在C＃中使用JSON& VB [ ^ ]

am using NewtonSoft to parse a JSON Api call.

The code must remain in the same format it is in.

My only problem is that I cannot iterate through the values of the JSON in a foreach loop.

How can I solve this problem?

public async Task callWebApi()
    {
        using (var httpClient = new HttpClient())
        {
            using (var request = new HttpRequestMessage(new HttpMethod("GET"), "https://www.metaweather.com/api/location/search/?lattlong=50.068,-5.316"))
            {
                var response = await httpClient.SendAsync(request);

                using (HttpContent content = response.Content)
                {


                    var jsonString = await response.Content.ReadAsStringAsync();
                    var data = JsonConvert.DeserializeObject<Object>(jsonString);
                Console.WriteLine("I need to parse distance, title, location_type, woeid,latt_long so that I can iterate through it using a foreach loop");
                Console.WriteLine(data);
                Console.Read();
                    // I don't know how to get the values of the json




                }
            }
        }

Here is a link to the working code:



What I have tried:

The problem is that I cannot iterate using a foreach loop.

解决方案

you need to create a class that represents your json object in C# and then deserialized to that. You can use visual studio too for getting the json or you can use json2csharp.com for that.


The class for your json is:

public class Location
{
    public int distance { get; set; }
    public string title { get; set; }
    public string location_type { get; set; }
    public int woeid { get; set; }
    public string latt_long { get; set; }
}

As you are receiving multiple objects i.e. an array you need to deserialize to an array of the above type.

var data = JsonConvert.DeserializeObject<Location[]>(jsonString);

Now you can iterate on the array.

foreach(var location in data)
{
  // your logic here
}

This is one of many common qestions asked on JSON Deserialization, so I have written an article to answer these questions: Working with JSON in C# & VB[^]

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