Question

我有这个JSON数组，我是从here得到的。我想从中提取一些硬币价格。这就是我想要的： BTC价格：15000美元 XRP价格：3美元我怎样才能在c＃中实现这个目标？

[
{
    "id": "bitcoin", 
    "name": "Bitcoin", 
    "symbol": "BTC", 
    "rank": "1", 
    "price_usd": "15235.5", 
    "price_btc": "1.0", 
    "24h_volume_usd": "17910600000.0", 
    "market_cap_usd": "255647119350", 
    "available_supply": "16779700.0", 
    "total_supply": "16779700.0", 
    "max_supply": "21000000.0", 
    "percent_change_1h": "0.36", 
    "percent_change_24h": "8.91", 
    "percent_change_7d": "-3.41", 
    "last_updated": "1514994260"
}, 
{
    "id": "ripple", 
    "name": "Ripple", 
    "symbol": "XRP", 
    "rank": "2", 
    "price_usd": "2.88573", 
    "price_btc": "0.00019146", 
    "24h_volume_usd": "4799670000.0", 
    "market_cap_usd": "111790712459", 
    "available_supply": "38739144847.0", 
    "total_supply": "99993093880.0", 
    "max_supply": "100000000000", 
    "percent_change_1h": "0.88", 
    "percent_change_24h": "19.54", 
    "percent_change_7d": "120.16", 
    "last_updated": "1514994241"
}
]

Answer 1

使用Newtonsoft.net解析JSON数据。

var obj = JsonConvert.DeserializeObject(json);

您可以创建用于保存数据的类

Class CryptoCurrencyDetails{

 public String id {get; set;}
 public String name{get; set;}
 public String symbol{get; set;}
    .
    .
    .

public String last_updated{get; set;}
}

然后您可以通过以下方式将JSON数组转换为C＃列表：

List<CryptoCurrencyDetails> list = JsonConvert.DeserializeObject<List<CryptoCurrencyDetails>>(json);

Answer 2

我建议你使用一个对象来映射这个数组，例如：

[DataContract]
public class CryptoCurrencyData
{
    [DataMember(Name ="id")]
    public int Id { get; set; }
    //One property for each Json array member
}

然后使用像这样的Json序列化器：

using (MemoryStream myMemoryStream = new MemoryStream(Encoding.Unicode.GetBytes(jsonArrayString)))
{
    DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(CryptoCurrencyData));
    return (CryptoCurrencyData)serializer.ReadObject(myMemoryStream);
}

如何在c＃中读取JSON数组？

2 个答案: