Csharp 正在try 从Blazor中的API读取JSON

我试图显示API https://api.battlemetrics.com/servers/20151421中的MaxPlayers，但结果为0，并且我应该得到200，因为API中的MaxPlayers=200.

请告诉我我做错了什么.

 <button @onclick="FetchData">lets go</button>

@if (todo != null)
{
    <p>maxPlayers: @todo.maxPlayers </p>
}

@code 
{
    public Attributes todo;
    public HttpClient httpClient = new HttpClient();

    public async Task FetchData()
    {
        todo = await httpClient.GetFromJsonAsync<Attributes>("https://api.battlemetrics.com/servers/20151421");

    }

    public class Attributes
    {
        public string id { get; set; }
        public string name { get; set; }
        public string address { get; set; }
        public string ip { get; set; }
        public int port { get; set; }
        public int players { get; set; }
        public int maxPlayers { get; set; }  // <-- this 
        public int rank { get; set; }
        public List<double> location { get; set; }
        public string status { get; set; }
        public Details details { get; set; }
        public bool @private { get; set; }
        public DateTime createdAt { get; set; }
        public DateTime updatedAt { get; set; }
        public int portQuery { get; set; }
        public string country { get; set; }
        public string queryStatus { get; set; }
    }