Where is Request.IsAjaxRequest() in Asp.Net Core MVC?

Question

To learn more about the new exciting Asp.Net-5 framework, I'm trying to build a web application using the newly released Visual Studio 2015 CTP-6.

Most things looks really promising, but I can't seem to find Request.IsAjaxRequest() - a functionality I've been using quite frequently on older MVC projects.

Is there a better way to do this - that made them remove this method - or is it "hidden" somewhere else?

Thanks for any advice on where to find it or what to do instead!

As far as I can tell, it's still there. It's an extension method in `System.Web.Mvc`, class `AjaxRequestExtensions`. That's for MVC5, I don't know about MVC6... — Patryk Ćwiek, Mar 26 '15 at 15:21
That's what the OP is asking about: MVC6. Of course it's still there in MVC5. — Chris Pratt, Mar 26 '15 at 15:37
@PatrykĆwiek Ok, yes, I'm testing MVC6. I might be wrong of course, but it seems to be missing from the "Microsoft.AspNet.Mvc": "6.0.0-beta3" package - or any of the other standard mvc-6 packages that comes with a new mvc-6 project. — mikal, Mar 26 '15 at 15:38
Not sure about this but try just: `IsAjaxRequest()`, without the `Request.` prefix. — Chris Pratt, Mar 26 '15 at 15:43
For a temporary solution on this, I decided to copy and modify the method from System.Web.Mvc.AjaxRequestExtensions. Hope it helps others, until this finds it way to the framework. public static class AjaxRequestExtensions { public static bool IsAjaxRequest(this HttpRequest request) { if (request == null) { throw new ArgumentNullException("request"); } return request.Headers != null && request.Headers["X-Requested-With"] == "XMLHttpRequest"; } } — mikal, Mar 26 '15 at 15:57
I think someone need to edit this question and change MVC5 to MVC6 in title. — zmechanic, May 03 '16 at 16:09

score 129 · Accepted Answer · edited Jan 13 '20 at 16:49

I got a little confused, because the title mentioned MVC 5.

Search for Ajax in the MVC6 github repo doesn't give any relevant results, but you can add the extension yourself. Decompilation from MVC5 project gives pretty straightforward piece of code:

/// <summary>
/// Determines whether the specified HTTP request is an AJAX request.
/// </summary>
/// 
/// <returns>
/// true if the specified HTTP request is an AJAX request; otherwise, false.
/// </returns>
/// <param name="request">The HTTP request.</param><exception cref="T:System.ArgumentNullException">The <paramref name="request"/> parameter is null (Nothing in Visual Basic).</exception>
public static bool IsAjaxRequest(this HttpRequestBase request)
{
  if (request == null)
    throw new ArgumentNullException(nameof(request));
  if (request["X-Requested-With"] == "XMLHttpRequest")
    return true;
  if (request.Headers != null)
    return request.Headers["X-Requested-With"] == "XMLHttpRequest";
  return false;
}

Since MVC6 Controller seems to be using Microsoft.AspNet.Http.HttpRequest, you'd have to check request.Headers collection for appropriate header by introducing few adjustments to MVC5 version:

/// <summary>
/// Determines whether the specified HTTP request is an AJAX request.
/// </summary>
/// 
/// <returns>
/// true if the specified HTTP request is an AJAX request; otherwise, false.
/// </returns>
/// <param name="request">The HTTP request.</param><exception cref="T:System.ArgumentNullException">The <paramref name="request"/> parameter is null (Nothing in Visual Basic).</exception>
public static bool IsAjaxRequest(this HttpRequest request)
{
  if (request == null)
    throw new ArgumentNullException(nameof(request));

  if (request.Headers != null)
    return request.Headers["X-Requested-With"] == "XMLHttpRequest";
  return false;
}

or directly:

var isAjax = request.Headers["X-Requested-With"] == "XMLHttpRequest"

The source code from the version of MVC5 is here: https://github.com/ASP-NET-MVC/aspnetwebstack/blob/master/src/System.Web.Mvc/AjaxRequestExtensions.cs — Fred, Jun 13 '16 at 09:34

score 40 · Answer 2 · edited Mar 09 '21 at 08:22

40

in asp.net core, You can use Context.Request.Headers.

bool isAjaxCall = Context.Request.Headers["x-requested-with"]=="XMLHttpRequest";

edited Mar 09 '21 at 08:22

radbyx

9,352
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answered Mar 15 '17 at 03:43

guhyeon

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2

what is namespace for `Context` ? – Muflix Feb 08 '19 at 13:09
2

@Aligned No, there is nothing in the fetch spec about adding an identifier in the request headers. The X-Requested-With isn't in the XMLHttpRequest spec either ( hence the "X-" prefix), but all the vendors added it as a convention. There is no indication any convention will done for fetch. If your system needs to know then you need to manually add a header when creating your fetch request – Robert Slaney Oct 30 '19 at 23:01

score 11 · Answer 3 · edited Oct 23 '19 at 08:09

11

For those who are working on ASP.Net Core

HttpContext.Request.Headers["X-Requested-With"] == "XMLHttpRequest";

Example
Controller.cs

bool isAjax = HttpContext.Request.Headers["X-Requested-With"] == "XMLHttpRequest";

if (isAjax)
   return Json(new { redirectTo = Url.Action("Index", "ControllerAction") });
else
   return RedirectToAction("Index", "ControllerAction");

edited Oct 23 '19 at 08:09

Saeed Zhiany

2,051
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answered Oct 23 '19 at 06:33

Ch Bhargav

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score 4 · Answer 4 · answered Aug 19 '20 at 21:12

After using the solution provided above by Patryk Ćwiek above I noticed a potential issue (largely due to my incorrectly typing "XMLHttpRequest" as "XmlHttpRequest"), which resulted in an incorrect return value. To accommodate my mistake, I updated it slightly. Here's my updated version:

    public static bool IsAjaxRequest(this HttpRequest request)
    {
        if (request == null)
            throw new ArgumentNullException(nameof(request));

        if (request.Headers != null)
            return !string.IsNullOrEmpty(request.Headers["X-Requested-With"]) &&
                string.Equals(
                    request.Headers["X-Requested-With"], 
                    "XmlHttpRequest", 
                    StringComparison.OrdinalIgnoreCase);

        return false;
    }

score 1 · Answer 5 · answered Sep 14 '22 at 09:56

1

Combining the top 2 answers, this is what worked for me

_ViewStart.cshtml (Entire Contents):

@{
    bool isAjaxCall = Context.Request.Headers["x-requested-with"] == "XMLHttpRequest";
    
    Layout = isAjaxCall ? null : "_YourLayoutName";
}

answered Sep 14 '22 at 09:56

The Benetrator

367
7
18

Where is Request.IsAjaxRequest() in Asp.Net Core MVC?

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