您可以查找 ?ReturnUrl= 查询字符串值，或者您可以创建自己的授权过滤器 &在 TempData 中设置一个字段，表明原因.

You can look for the ?ReturnUrl= querystring value, or you can create your own authorization filter & set a field in TempData indicating the reason.

这是一个简单的自定义过滤器，可以解决问题:

Here is a simple custom filter that will do the trick:

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class CustomAuthorizeAttribute : AuthorizeAttribute
{

    // NOTE: This is not thread safe, it is much better to store this
    // value in HttpContext.Items.  See Ben Cull's answer below for an example.
    private bool _isAuthorized;

    protected override bool AuthorizeCore(System.Web.HttpContextBase httpContext)
    {
        _isAuthorized = base.AuthorizeCore(httpContext);
        return _isAuthorized;
    }

    public override void OnAuthorization(AuthorizationContext filterContext)
    {
        base.OnAuthorization(filterContext);

        if(!_isAuthorized)
        {
            filterContext.Controller.TempData.Add("RedirectReason", "Unauthorized");
        }
    }
}

然后在您看来，您可以执行以下操作:

Then in your view, you can do something like this:

@if(TempData["RedirectReason"] == "Unauthorized")
{
    <b>You don't have permission to access that area</b>
}

(虽然我推荐一种比这些魔法字符串更好的方法，但你懂的)