Question

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

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

from scipy.ndimage import median_filter
values = [1,1,1,0,1,1,1,1,1,1,1,2,1,1,1,10,1,1,1,1,1,1,1,1,1,1,0,1]
print median_filter(values, 7, mode='mirror')

Answer 1

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>();

    }
}

更新：

另一种方法是您也可以通过DI使用[ServiceFilter]或[TypeFilter]，请参阅

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

1。在启动时，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.Controller

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

如何从控制器调用构造函数中具有参数（接口）的属性

1 个答案: