c# - 为什么不能使用静态只读对象属性？

Question

这是常量类：

 public static class Constants
    {
        public const string USER_ID = "conduent";
        public const string PASSWORD = "593becd1-02f6-46f0-bf34-25b393ad041b";
        public static readonly Uri BASE_URI = new Uri("https://staging.test-476b.com");
        public static readonly Uri GET_TOKEN_URI = new Uri("api/session");
        public static readonly Uri SEND_CASE_URI = new Uri("api/referral_request");
    }

这是用法

public class DanestreetHttp
    {

        private AuthToken authToken = null;

        private readonly HttpClient httpClient = new HttpClient()
        {
            BaseAddress = Constants.BASE_URI
        };
}

在屏幕截图上，您可以看到错误，在我更改BaseAddress = Constants.BASE_URI为BaseAddress = new System.Uri("https://staging.test-476b.com"). 静态只读初始化有什么问题？

屏幕

PS。我目前的解决方案：BaseAddress = new Uri(Constants.BaseAddress)

Answer 1

问题是 2 或 URI 无效Constants，阻止此类初始化属性。如果您更换它应该可以工作

public static readonly Uri GET_TOKEN_URI = new Uri("api/session");
public static readonly Uri SEND_CASE_URI = new Uri("api/referral_request");

和

public static readonly Uri GET_TOKEN_URI = new Uri("http://api/session");
public static readonly Uri SEND_CASE_URI = new Uri("http://api/referral_request");

（或 https）

小提琴