ActionFilter 未被稱為 WebAPI/.netCore

Question

我有一个用 .NETCore 我想要的只是使用操作过滤器拦截请求，然后从标头中验证 JWT 令牌。我编写了一个动作过滤器，如下所示：

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操作过滤器，如下所示：

services.AddScoped<AuthorizeJWT>();

并像下面这样装饰我的控制器：

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

但由于某种原因，我的操作过滤器只是没有被调用。配置中缺少什么吗？

Answer 1

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。

如果从继承中删除接口，然后更改OnActionExecuting方法定义以覆盖基类实现，则一切都将按预期工作：

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");
}
}
}
}