c# - Action 筛选器未称为WebAPI/.net Core

我有一个用.NETCore编写的Web API应用程序，我想要做的就是使用操作过滤器拦截请求，然后从标头中验证JWT令牌。我写了一个如下所示的ActionFilter：

using Microsoft.AspNetCore.Mvc.Filters;
using Newtonsoft.Json;

namespace Applciation.ActionFilters
{
    public class AuthorizeJWT: ActionFilterAttribute, IActionFilter
    {
        void IActionFilter.OnActionExecuting(ActionExecutingContext context)
        {
            var jwt = context.HttpContext.Request.Headers["JWT"];

            try
            {
                var json = new JwtBuilder()
                    .WithSecret(File.ReadLines("").ToList().First())
                    .MustVerifySignature()
                    .Decode(jwt);

                var tokenDetails = JsonConvert.DeserializeObject<dynamic>(json);
            }
            catch (TokenExpiredException)
            {
                throw new Exception("Token is expired");
            }
            catch (SignatureVerificationException)
            {
                throw new Exception("Token signature invalid");
            }
            catch(Exception ex)
            {
              throw new Exception("Token has been tempered with");
            }
        }
    }
}

现在，我在服务配置中添加了动作过滤器，如下所示：

services.AddScoped<AuthorizeJWT>();

并如下所示装饰我的控制器：

 [AuthorizeJWT]
    public virtual async Task<IActionResult> Ceate([FromBody]CreateDto,createDto)
{
   //method body
}

但是由于某种原因，我的动作筛选器没有被调用。配置中缺少什么吗？

最佳答案

ActionFilter的定义不正确。您只需要从ActionFilterAttribute类派生而不是从接口IActionFilter派生，因为ActionFilterAttribute类已经实现了该接口。

如果您从继承中删除接口，然后更改您的OnActionExecuting方法定义以覆盖基类实现，那么一切将按预期工作：

using Microsoft.AspNetCore.Mvc.Filters;
using Newtonsoft.Json;

namespace Applciation.ActionFilters
{
    public class AuthorizeJWT: ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            var jwt = context.HttpContext.Request.Headers["JWT"];

            try
            {
                var json = new JwtBuilder()
                    .WithSecret(File.ReadLines("").ToList().First())
                    .MustVerifySignature()
                    .Decode(jwt);

                var tokenDetails = JsonConvert.DeserializeObject<dynamic>(json);
            }
            catch (TokenExpiredException)
            {
                throw new Exception("Token is expired");
            }
            catch (SignatureVerificationException)
            {
                throw new Exception("Token signature invalid");
            }
            catch(Exception ex)
            {
              throw new Exception("Token has been tempered with");
            }
        }
    }
}

关于c# - Action 筛选器未称为WebAPI/.net Core，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50690773/