C# 添加接口筛选器

1.创建一个mvc

2.在App_Start文件夹中找到WebApiConfig文件，没有就手动添加一个

3.在Global.asax文件中注册一下

 public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            GlobalConfiguration.Configure(WebApiConfig.Register);
        }
    }
}

4.手动添加一个文件AuthFilterAttribute

5.编写AuthFilterAttribute文件中内容编写方法必须得继承: AuthorizationFilterAttribute

public class AuthFilterAttribute : AuthorizationFilterAttribute
{
public override void OnAuthorization(HttpActionContext actionContext)
{
//如果Action带有AllowAnonymousAttribute，则不进行授权验证
if (actionContext.ActionDescriptor.GetCustomAttributes<AllowAnonymousAttribute>().Any())
{
return;
}
else
{
//此处写自己的逻辑
}
}
}

6.在WebApiConfig文件中注册全局Filter

 public static void Register(HttpConfiguration config)
        {
            config.MapHttpAttributeRoutes();
            //注册全局Filter
            config.Filters.Add(new AuthFilterAttribute());

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }