如何从控制器调用构造函数中具有参数（接口）的属性

public class HMACAuthenticationAttribute : Attribute, IAsyncAuthorizationFilter
    {
       public HMACAuthenticationAttribute(IUser user)  
       {
         .....
       }
    }

上面的代码是属性类，下面的代码是控制器。我想用参数调用属性

[HMACAuthentication()]
public class WeatherForecastController : ControllerBase
{
}

考虑到参数必须是编译时常量，属性接受接口没有多大意义。

一种方法是您可以将接口注册为服务，并使用下面的代码获取它们，而无需构造函数注入。例如：

1.接口：

public interface IUserService
{
   //..
}

public class UserService : IUserService
{
  //..
}

2.启动时：

public void ConfigureServices(IServiceCollection services)
{
   services.AddSingleton<IUserService, UserService>();
}

3.自定义授权属性

public class HMACAuthenticationAttribute, IAsyncAuthorizationFilter
{

    public HMACAuthenticationAttribute()
    {

    }
    public async Task OnAuthorizationAsync(AuthorizationFilterContext context)
    {
        var user = context.HttpContext.RequestServices.GetRequiredService<IUserService>();

    }
}

Update:

另一种方法是你也可以使用[ServiceFilter] or [TypeFilter]通过DI，参考

https://learn.microsoft.com/en-us/aspnet/core/mvc/controllers/filters?view=aspnetcore-3.1#servicefilterattribute https://learn.microsoft.com/en-us/aspnet/core/mvc/controllers/filters?view=aspnetcore-3.1#servicefilterattribute

1.启动时，注册HMACAuthenticationAttribute:

public void ConfigureServices(IServiceCollection services)
{
   services.AddScoped<HMACAuthenticationAttribute>();
   services.AddSingleton<IUserService, UserService>();
}

2.自定义授权属性

public class HMACAuthenticationAttribute, IAsyncAuthorizationFilter
{

    public HMACAuthenticationAttribute(IUserService user)
    {

    }

}

3.控制器

[ServiceFilter(typeof(HMACAuthenticationAttribute))]
public class WeatherForecastController : ControllerBase
{
}