Add all query strings on controller action - asp.net-mvc-4

Question

I have a simple mvc4 application. An action link opens a view with bunch of query string parameters. The view contains a simple form when you click on submit button it posts the form and comes back to the view but I lost the query strings. what I must to do to have same query strings even after you have submitted the form?

Answer 1

One possibility is to specify the current request as action attribute of your form:
<form action="#Request.Url.AbsoluteUri" method="post">
...
</form>
But this will POST to the same resource. If you want to specify a different controller and/or action you could write a custom BeginForm helper which will do the job.
Something along the lines of:
public static class FormExtensions
{
public static IDisposable MyBeginForm(this HtmlHelper html, string controller, string action)
{
var builder = new TagBuilder("form");
var urlHelper = new UrlHelper(html.ViewContext.RequestContext);
var routeValues = new RouteValueDictionary();
var query = html.ViewContext.RequestContext.HttpContext.Request.QueryString;
foreach (string key in query)
{
routeValues[key] = query[key];
}
builder.MergeAttribute("action", urlHelper.Action(action, controller, routeValues));
builder.MergeAttribute("method", "POST", true);
html.ViewContext.Writer.Write(builder.ToString(TagRenderMode.StartTag));
var form = new MvcForm(html.ViewContext);
return form;
}
}
and then:
#using (Html.MyBeginForm("myaction", "mycontroller"))
{
...
}
This will effectively keep the current url query string parameters.