IAuthorizationFilter ASP.Net Core 3中的依赖注入

Question

我创建了一个过滤器IAuthorizationFilter，我需要在这个属性中使用DepencyInjection。

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true, Inherited = true)]
public class AllowAccessAttribute : Attribute, IAuthorizationFilter
{
    private readonly IDomainUnitOfWork unitofwork;
    private readonly HttpContext httpContext;

    public AllowAccessAttribute(IDomainUnitOfWork unitofwork,HttpContext httpContext)
    {
        this.unitofwork = unitofwork;
        this.httpContext = httpContext;
    }
    public void OnAuthorization(AuthorizationFilterContext context)
    {
        string controller = context.RouteData.Values["controller"].ToString();
        string action = context.RouteData.Values["action"].ToString();
        var userId = httpContext.User.Identity.GetUserId<long>();
        var access = string.Format("{0}:{1}", controller, action);
        if (unitofwork.UserRepository.AccessLevelRepository.ValidateAccess(userId, access))
            context.Result = new StatusCodeResult(403);
    }
}

当我需要使用这个属性时，它会显示错误。

[HttpGet]
[AllowAccess]
public async Task<ApiReturn> ChangeUserActiveStatus(long id)
{
    var result = await dispatchers.SendAsync(new UserActiveStateCommand { id = id });
    if (result.Success)
    {
        return Ok();
    }
    return BadRequest(result.Exception);
}

并显示此错误：

不存在与'AllowAccessAttribute.AllowAccessAttribute(IDomainUnitOfWork，HttpContext所需的形式参数“单位工作”相对应的参数(

)

，有什么问题？我如何解决这个问题？

Answer 1

您需要在IoC容器中注册服务。

Startup.cs：

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddScoped<IDomainUnitOfWork, DomainUnitOfWork>(); // per request injection
    ...
}

还尝试将方法的属性更改为TypeFilter

[HttpGet]
[TypeFilter(typeof(AllowAccessAttribute))]
public async Task<ApiReturn> ChangeUserActiveStatus(long id)