can request querystring be accessed from htmlhelper

问题

Hi Can query string be accessed in HTMLHelper extension methods. We need to render differently depending on the querystring in the request.

回答1:

Yes, through the current context, which is a property on HTML Helper.

public static string DoThis(this HtmlHelper helper)
{
   string qs = helper.ViewContext.HttpContext.Request.QueryString.Get("val");
   //do something on it
}

回答2:

Sure:

public static MvcHtmlString Foo(this HtmlHelper htmlHelper)
{
    var value = htmlHelper.ViewContext.HttpContext.Request["paramName"];
    ...
}

回答3:

You can access the querystring via the HttpContext object. Like so...

string itemVal = System.Web.HttpContext.Current.Request.QueryString["item"];

来源：https://stackoverflow.com/questions/4145111/can-request-querystring-be-accessed-from-htmlhelper