C# 将 JSON 反序列化为对象

Question

我的 C# 程序有点问题。这是我在 C# 中的第一个程序，所以请原谅 :)

我想将我的 json 文件反序列化为对象，但我不知道我的类应该如何构建。我正在使用 Newtonsoft JSON 库。

JSON 文件:

http://api.nbp.pl/api/exchangerates/tables/A/last/?format=json

---

Form1.cs:

    private void button1_Click(object sender, EventArgs e)
    {
        CurrencyCodeValues k = new CurrencyCodeValues();
        WebClient myWebClient = new WebClient();
        dynamic result = myWebClient.DownloadString("http://api.nbp.pl/api/exchangerates/tables/A/last/?format=json");
        IList<CurrencyCodeValues> m = JsonConvert.DeserializeObject<CurrencyCodeValues>(result);
    }

---

Class1.cs:

class CurrencyCodeValues
{
    public string table { get; set; }
    public string no { get; set; }
    public string effectiveDate { get; set; }
    public List<rates_> rates { get; set; }

}

public class rates_
{
    public string currency { get; set; }
    public string code { get; set; }
    public float mid { get; set; }
}

---

错误信息:

Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'WindowsFormsApplication4.CurrencyCodeValues' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. Path '', line 1, position 1.

Answer 1

根据你的错误信息，你的类(class)应该是这样的

public class Rootobject
{
    public Class1[] Property1 { get; set; }
}

public class Class1
{
    public string table { get; set; }
    public string no { get; set; }
    public string effectiveDate { get; set; }
    public Rate[] rates { get; set; }
}

public class Rate
{
    public string currency { get; set; }
    public string code { get; set; }
    public float mid { get; set; }
}

然后像这样反序列化

JsonConvert.DeserializeObject<Rootobject>(result);