How to get data from json api using C # using httpwebrequest?
I want to get all variables from https://api.coinmarketcap.com/v1/ticker/ in my c # console app. How can i do this?
I started by getting the entire page as a stream. What now?
private static void start_get()
{
HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create
(string.Format("https://api.coinmarketcap.com/v1/ticker/"));
WebReq.Method = "GET";
HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
Console.WriteLine(WebResp.StatusCode);
Console.WriteLine(WebResp.Server);
Stream Answer = WebResp.GetResponseStream();
StreamReader _Answer = new StreamReader(Answer);
Console.WriteLine(_Answer.ReadToEnd());
}
+8
source to share
2 answers
First you need a special class for deserialization:
public class Item
{
public string id { get; set; }
public string name { get; set; }
public string symbol { get; set; }
public string rank { get; set; }
public string price_usd { get; set; }
[JsonProperty(PropertyName = "24h_volume_usd")] //since in c# variable names cannot begin with a number, you will need to use an alternate name to deserialize
public string volume_usd_24h { get; set; }
public string market_cap_usd { get; set; }
public string available_supply { get; set; }
public string total_supply { get; set; }
public string percent_change_1h { get; set; }
public string percent_change_24h { get; set; }
public string percent_change_7d { get; set; }
public string last_updated { get; set; }
}
Then you can use Newtonsoft Json , a free serialization and deserialization JSON structure, as follows to get your objects (including the following using
):
using System.Net;
using System.IO;
using Newtonsoft.Json;
private static void start_get()
{
HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(string.Format("https://api.coinmarketcap.com/v1/ticker/"));
WebReq.Method = "GET";
HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
Console.WriteLine(WebResp.StatusCode);
Console.WriteLine(WebResp.Server);
string jsonString;
using (Stream stream = WebResp.GetResponseStream()) //modified from your code since the using statement disposes the stream automatically when done
{
StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8);
jsonString = reader.ReadToEnd();
}
List<Item> items = JsonConvert.DeserializeObject<List<Item>>(jsonString);
Console.WriteLine(items.Count); //returns 921, the number of items on that page
}
Finally, the list of items is stored in items
.
+13
source to share
Simplified version of Keyur PATEL work.
static void GetCoinValues()
{
string json = new WebClient().DownloadString("https://api.coinmarketcap.com/v1/ticker/");
List<Item> items = JsonConvert.DeserializeObject<List<Item>>(json);
foreach (var item in items)
{
Console.WriteLine("ID: " + item.id.ToUpper());
Console.WriteLine("Name: " + item.name.ToUpper());
Console.WriteLine("Symbol: " + item.symbol.ToUpper());
Console.WriteLine("Rank: " + item.rank.ToUpper());
Console.WriteLine("Price (USD): " + item.price_usd.ToUpper());
Console.WriteLine("\n");
}
}
+1
source to share