将 json 解析为对象列表并在控制台中显示数据

Question

我正在尝试访问通过解析 json 获得的对象列表的属性，但我什至不确定它是否解析正确。这是我的代码：

public class Currency
{

    public int Broj_tecajnice { get; set; }
    public string Drzava { get; set; }
    public string Drzava_iso { get; set; }
    public string Sifra_valute { get; set; }
    public string Valuta { get; set; }
    public int Jedinica { get; set; }
    public float Kupovni_tecaj { get; set; }
    public float Srednji_tecaj { get; set; }
    public float Prodajni_tecaj { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        using (WebClient webClient = new System.Net.WebClient())
        {
            WebClient client = new WebClient();
            var json = 
client.DownloadString("http://api.hnb.hr/tecajn/v2");
            List<Currency> currencies = 
 JsonConvert.DeserializeObject<List<Currency>>(json);
            currencies.ForEach(c => 
Console.WriteLine(currencies.ToString()));

        }
    }
}

简而言之，api 看起来像这样：

[{"broj_tecajnice":"85","datum_primjene":"2019-05-01","drzava":"EMU","drzava_iso":"EMU","sifra_valute":"978","valuta":"EUR","jedinica":1,"kupovni_tecaj":"7,388924","srednji_tecaj":"7,411157","prodajni_tecaj":"7,433390"}, {"broj_tecajnice":"85","datum_primjene":"2019-05-01","drzava":"EMU","drzava_iso":"EMU","sifra_valute":"978","valuta":"EUR","jedinica":1,"kupovni_tecaj":"7,388924","srednji_tecaj":"7,411157","prodajni_tecaj":"7,433390"}]

等等，它有 14 个对象，我设法在列表中获取所有 14 个对象，但我无法访问对象属性

Answer 1

字符串调用看起来不正确。您需要使用集合中对象的属性构造一个字符串。

例如

currencies.ForEach(c => 
    Console.WriteLine($"drzava_iso: {c.Drzava_iso}, Sifra_valute: {c.Sifra_valute}, ...")
);

其他一切看起来都应该如此。

Answer 2

您必须在 ForEach 函数的 Action 中使用 c 参数：

如果您在 Currency class 中覆盖了 ToString :

currencies.ForEach(c => Console.WriteLine(c.ToString()));

否则，您可以调用委托：

currencies.ForEach(delegate(Currency c)
{
    // make your ToString() function here or any other code
    Console.WriteLine(c.Broj_tecajnice);
});

阅读更多关于 ForEach 的信息：https://docs.microsoft.com/fr-fr/dotnet/api/system.collections.generic.list-1.foreach?view=netframework-4.7

将 json 解析为对象列表并在控制台中显示数据

Parsing json to list of objects and displaying data in console

c#

json

webclient