反序列化Json對象列表返回null

Question

我正在嘗試將一些Json數據反序列化到列表中，但是該列表未返回任何數據。

我正在使用的Json字符串的示例是

{
"sequence":82334,
"bids":
[
    ["7660","10.02477743",11],
    ["7600","0.01",1],
    ["7500","0.01",1]
],  
"asks":
[
    ["7672.57","0.63979186",1],
    ["7673.64","1",1],
    ["7678.95","1",1]
]

}

我用json2csharp生成了給我的對象類

public class ProductOrderBook
{
   public int sequence { get; set; }
   public List<List<object>> bids { get; set; }
   public List<List<object>> asks { get; set; }
}

這是我用來反序列化json的方法

public static async Task<List<ProductOrderBook>> GetProductOrderBook()
{
    string ts = GetNonce();
    string method = "/products/BTC-USD/book?level=2";
    string sig = GetSignature(ts, "GET", method, string.Empty);
    List<ProductOrderBook> productOrderBooks;
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri(baseURL);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        client.DefaultRequestHeaders.Add("CB-ACCESS-KEY", apiKey);
        client.DefaultRequestHeaders.Add("CB-ACCESS-SIGN", sig);
        client.DefaultRequestHeaders.Add("CB-ACCESS-TIMESTAMP", ts);
        client.DefaultRequestHeaders.Add("CB-ACCESS-PASSPHRASE", passphrase);
        client.DefaultRequestHeaders.Add("User-Agent", userAgent);

        HttpResponseMessage response = client.GetAsync(method).Result;
        string json = await response.Content.ReadAsStringAsync();
        productOrderBooks = JsonConvert.DeserializeObject<List<ProductOrderBook>>(json);
        }
        return await Task.Run(() => productOrderBooks);            
    }

我正在響應字符串中返回有效的Json，但不確定為什么productOrderBooks列表中沒有數據。 我是否必須再創建兩個對象類來保存出價和要價數據並將其傳遞給

 public List<List<object>> bids { get; set; }
 public List<List<object>> asks { get; set; }

Answer 1

根據您發布的json，它不是ProductOrderBook列表。 它只是ProductOrderBook的單個實例。

因此，您的代碼應為：

public static async Task<ProductOrderBook> GetProductOrderBook()
{
    string ts = GetNonce();
    string method = "/products/BTC-USD/book?level=2";
    string sig = GetSignature(ts, "GET", method, string.Empty);
    ProductOrderBook productOrderBooks;
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri(baseURL);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        client.DefaultRequestHeaders.Add("CB-ACCESS-KEY", apiKey);
        client.DefaultRequestHeaders.Add("CB-ACCESS-SIGN", sig);
        client.DefaultRequestHeaders.Add("CB-ACCESS-TIMESTAMP", ts);
        client.DefaultRequestHeaders.Add("CB-ACCESS-PASSPHRASE", passphrase);
        client.DefaultRequestHeaders.Add("User-Agent", userAgent);

        HttpResponseMessage response = client.GetAsync(method).Result;
        string json = await response.Content.ReadAsStringAsync();
        productOrderBooks = JsonConvert.DeserializeObject<ProductOrderBook>(json);
        }
        return await Task.Run(() =>  productOrderBooks);            
    }