创建接受 T 作为枚举的泛型类

Question

I have this class and i want that to accept a generic as an enum I can pas it in the constructor but I want to use generic.

this is my interface:

public interface ITrnApi<TEnum> : IDisposable where TEnum : struct

and I want my class to be like this one

public class TrnApi<TEnum> : ITrnApi<TEnum> where TEnum : struct
{
    private readonly HttpClient _http;

    public TrnApi(HttpClient http, TEnum company)
    {
        _http = http;
        _http.BaseAddress = company.ToBaseUrl().ToUri();

        //public enum Company
        //{
        //    test = 1,
        //    othertest = 2
        //}
    }
}

but get this error:

'TEnum' does not contain a definition for 'ToBaseUrl' and the best extension method overload 'Extentions.ToBaseUrl(Company, string)' requires a receiver of type 'Company'

How can I do that?

Answer 1

The System.Enum constraint is available starting from C# 7.3.

public class TrnApi<TEnum> : ITrnApi<TEnum> where TEnum : struct, Enum
{
    private readonly HttpClient _http;

    public TrnApi(HttpClient http, TEnum company)
    {
        _http = http;
        _http.BaseAddress = company.ToBaseUrl().ToUri();
        /* ... */
    }
}