[英]C# - deserialize json
I'm trying to write a trading bot as a learning experience (don't worry, I won't use it). 我正在尝试编写一个交易机器人作为学习经验(不用担心,我不会使用它)。 I am trying to deserialize the incoming data with no luck.
我试图反序列化传入的数据,但是没有运气。 It's my first time working with json in C# but I have done so in other languages, certainly not very good at it though.
这是我第一次在C#中使用json,但是我已经用其他语言做到了,尽管当然不是很好。
I created a class that looks like this: 我创建了一个看起来像这样的类:
public class Coin
{
public string symbol { get; set; }
public double price {get;set;}
}
I am fetching and reading the data like this: 我正在这样读取和读取数据:
using (WebClient w = new WebClient())
{
try
{
var json = w.DownloadString("https://api.binance.com/api/v3/ticker/price");
int length = json.Length;
string newJson = json.Substring(1, length-2);
//had to create new string because having [] made it crash
Coin coin = JsonConvert.DeserializeObject<Coin>(newJson);
Console.Write(coin); // this does not print anything
}catch(JsonReaderException e){}
}
Incoming data looks like this (or just follow the link): 传入数据如下所示(或仅点击链接):
{"symbol":"ETHBTC","price":"0.07190100"},{"symbol":"LTCBTC","price":"0.01298100"}
Now, I'm trying to only get one of them, but I am getting all. 现在,我尝试仅获得其中之一,但获得全部。 First of all I'm guessing there's something wrong with my Coin class and second I don't know how to access just one of them.
首先,我猜我的Coin类存在问题,其次,我不知道如何访问其中的一个。
Thanks 谢谢
You are getting array of objects, but you are trying to deserialise into a single object. 您正在获取对象数组,但是您正在尝试反序列化为单个对象。 There is a reason for
[]
symbols. 有
[]
符号的原因。 Don't remove them. 不要删除它们。 Instead serialise into
Coin[]
and then take .FirstOrDefault()
from that array. 而是序列化为
Coin[]
,然后从该数组中获取.FirstOrDefault()
。
Something like this: 像这样:
using System.Linq;
var json = w.DownloadString("https://api.binance.com/api/v3/ticker/price");
var coins = JsonConvert.DeserializeObject<Coin[]>(json);
var firstCoin = coins.FirstOrDefault();
if (firstCoin != null)
{
Console.Write($"Symbol: {firstCoin.symbol}; Price: {firstCoin.price}");
}
I don't see anything wrong with your Coin class. 我认为您的Coin课程没有任何问题。 Secondly, what I advice you to do is to deserialize the JSON into a List of coins.
其次,我建议您将JSON反序列化为硬币列表。
List<Coin> coins = new List<Coin>();
coins = JsonConvert.DeserializeObject<List<Coin>>(newJson);
In your code you deserialized multiple Coin-objects and you wanted to store them in a variable that holds one Coin-object. 在您的代码中,您反序列化了多个硬币对象,并且想要将它们存储在一个包含一个硬币对象的变量中。 That is why I adviced to make a list of objects, so that multiple Coin-objects can be stored.
这就是为什么我建议列出一个对象列表,以便可以存储多个硬币对象的原因。
You can then get one item of the list by index. 然后,您可以按索引获得列表中的一项。
// This returns the first value
var oneItem = coins[0]
I hope this did the trick! 我希望这能解决问题!
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