.NET Core 操作筛选器不是属性类

Question

我有我想调用的这个动作过滤器，我已经在 Startup.cs 中声明了它。但是，当我在班级上方调用它时，出现此错误：

LogUserNameFilter 不是属性类

我不确定我错过了什么。

public class LogUserNameFilter : IActionFilter
{
    private readonly RequestDelegate next;

    public LogUserNameFilter(RequestDelegate next)
    {
        this.next = next;
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        throw new NotImplementedException();
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        LogContext.PushProperty("UserName", context.HttpContext.User.Identity.Name);
    }
}

Startup.cs

services.AddScoped<LogUserNameFilter>();

类声明

[LogUserNameFilter]
public class HomeController : Controller{


}

Answer 1

为了使用一个类作为属性，该类应该继承Attribute类，特别是在你的情况下，你应该继承ActionFilterAttribute：

public class LogUserNameFilter : ActionFilterAttribute, IActionFilter
{
    private readonly RequestDelegate next;

    public LogUserNameFilter(RequestDelegate next)
    {
        this.next = next;
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        throw new NotImplementedException();
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        LogContext.PushProperty("UserName", context.HttpContext.User.Identity.Name);
    }
}

您可以在MSDN找到更多使用信息