当查询字符串参数不正确时,如何在ASP .NET MVC中返回404页面

Question

让我们想象一下,我有以下行动

public ViewResult Products(string color)
{...}

和url"products"映射到此操作的路由.

根据SEO提示链接/products?color=red应该返回

200好的

但链接 /products?someOtherParametr=someValue

404未找到

所以问题是 - 如何处理未出现的查询参数并在这种情况下返回404

Answer 1

考虑接受的答案是什么是从ASP.NET MVC操作发送HTTP 404响应的正确方法？,有一个特殊的ActionResult,可以满足您的期望.

public class HomeController : Controller
{
    public ViewResult Products(string color)
    {
        if (color != "something") // it can be replaced with any guarded clause(s)
            return new HttpNotFoundResult("The color does not exist.");
        ...
    }
}

更新:

public class HomeController : Controller
{
    public ViewResult Products(string color)
    {
        if (Request.QueryString.Count != 1 || 
            Request.QueryString.GetKey(0) != "color")
            return new HttpNotFoundResult("the error message");
        ...
    }
}

Answer 2

在执行Action Method之前验证这一点.此方法适用于您项目的所有Controller或特定的Action方法.

控制器动作方法

[attr]  // Before executing any Action Method, Action Filter will execute to 
        //check for Valid Query Strings.
public class ActionResultTypesController : Controller
{
    [HttpGet]
    public ActionResult Index(int Param = 0)
    {
        return View();
    }

    [HttpPost]
    public ActionResult Index(MyViewModel obj)
    {
        return View(obj);
    }

}

动作过滤器

public class attr : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (filterContext.ActionParameters.Count == 0 &&
                  System.Web.HttpContext.Current.Request.QueryString.Count > 0)
        {
              //When no Action Parameter exists and Query String exists. 
        }
        else
        {
            // Check the Query String Key name and compare it with the Action 
            // Parameter name
            foreach (var item in System.Web.HttpContext
                                       .Current
                                       .Request.QueryString.Keys)
            {
                if (!filterContext.ActionParameters.Keys.Contains(item))
                {
                    // When the Query String is not matching with the Action 
                    // Parameter
                }
            }
        }
        base.OnActionExecuting(filterContext);
    }
}

如果你注意上面的代码,我们正在检查Action参数,如下面的屏幕所示.

在ActionString参数中不存在QueryString传递的情况下,我们可以做些什么？我们可以将用户重定向到另一个页面,如此链接所示.

filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary
                        {
                            {"action", "ActionName"},
                            {"controller", "ControllerName"},
                            {"area", "Area Name"},
                            {"Parameter Name","Parameter Value"}
                        });

要么

我们可以这样做.下面提到的代码将写入OnActionExecuting方法覆盖

filterContext.Result = new HttpStatusCodeResult(404);