C# ActionFilterAttribute中的GetService返回null

我创建了一个操作过滤器，根据传入的id检查id是否正确。 筛选器的构造函数方法采用服务类型参数

我需要服务在ActionMethod运行之前检查此id。但是

GetService（）

method返回null

ActionFilter

 public class ContainsFilterAttribute : ActionFilterAttribute
{
    private Type _service;
    private Type _entity;
    private IdSections _idSections;
    public ContainsFilterAttribute(Type service, Type entity, IdSections idSections)
    {
        if (!typeof(ICommonService).IsAssignableFrom(service) || !typeof(IEntity).IsAssignableFrom(entity))
        {
            throw new System.Exception("Service or entity undefined.");
        }
        _service = service;
        _entity = entity;
        _idSections = idSections;
    }
    public override void OnActionExecuting(ActionExecutingContext context)
    {
        //returns null service
        var service = (ICommonService)context.HttpContext.RequestServices.GetService(_service);
        var entity = (IEntity)Activator.CreateInstance(_entity);
        
        if (IdSections.FromRoute == _idSections)
        {
            entity.Id = (int)context.ActionArguments.FirstOrDefault(pair => pair.Key.ToUpper().Contains("ID")).Value;
        }
        var res = service.Contains(entity);
    }
}

行动方法

    [HttpGet]
    [Route("{userId}/user-channels")]
    [ContainsFilter(typeof(UserManager), typeof(User), IdSections.FromRoute)]
    public IActionResult GetUserChannels(int userId)
    {
        var result = _channelService.GetUserChannels(userId);
        if (result.IsSuccessful)
        {
            var mapResult = _mapper.Map<List<ChannelForListDto>>(result.Data);
            return Ok(mapResult);
        }
        return this.ServerError(result.Message);
    }

[HttpGet]
[路由（“{userId}/用户通道”）]
[ContainsFilter（typeof（UserManager）、typeof（User）、IdSections.FromRoute）]
公共IActionResult GetUserChannel（int userId）
{
var result=\u channelService.GetUserChannels（userId）；
如果（结果：IsSuccessful）
{
var mapreult=_mapper.Map（result.Data）；
返回Ok（映射结果）；
}
返回此.ServerError（result.Message）；
}

注射

services.AddScoped<IUserService, UserManager>();

services.addScope（）；

IUserService

已注册为该服务

services.AddScoped<IUserService, UserManager>();

召唤

反而

 [ContainsFilter(typeof(UserManager), typeof(User), IdSections.FromRoute)]

[ContainsFilter(typeof(IUserManager), typeof(User), IdSections.FromRoute)]