问题描述
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
Above code is attribute class and below code is controller. I want to call attribute with parameter
[HMACAuthentication()]
public class WeatherForecastController : ControllerBase
{
}
推荐答案
它赚不了多少鉴于参数必须是编译时常量，对于属性就有意义。
It doesn't make much sense for an attribute to accept interfaces, given that the arguments have to be compile-time constants.
一种方法是，您可以将接口注册为服务并使用下面的代码没有构造函数注入。例如：
One way is that you could register your interfaces as services and get them using below code without constructor injection.For example:
1.Interface：
1.Interface:
public interface IUserService
{
//..
}
public class UserService : IUserService
{
//..
}
2。启动时：
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton<IUserService, UserService>();
}
3.Custom Authorization Attribute
3.Custom Authorization Attribute
public class HMACAuthenticationAttribute, IAsyncAuthorizationFilter
{
public HMACAuthenticationAttribute()
{
}
public async Task OnAuthorizationAsync(AuthorizationFilterContext context)
{
var user = context.HttpContext.RequestServices.GetRequiredService<IUserService>();
}
}
更新：
另一种方式是您也可以使用 [ServiceFilter] 或 [TypeFilter] 通过DI，请参阅
Another way is that you could also use [ServiceFilter] or [TypeFilter] by DI,refer to
1。在启动时，注册 HMACAuthenticationAttribute ：
1.In startup, register HMACAuthenticationAttribute:
public void ConfigureServices(IServiceCollection services)
{
services.AddScoped<HMACAuthenticationAttribute>();
services.AddSingleton<IUserService, UserService>();
}
2.Custom Authorization Attribute
2.Custom Authorization Attribute
public class HMACAuthenticationAttribute, IAsyncAuthorizationFilter
{
public HMACAuthenticationAttribute(IUserService user)
{
}
}
3.Controller
3.Controller
[ServiceFilter(typeof(HMACAuthenticationAttribute))]
public class WeatherForecastController : ControllerBase
{
}
这篇关于如何从控制器调用构造函数中具有参数（接口）的属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！