AjaxRedirectResult and AjaxRequestExtension

AjaxRedirect.cs

using System;
using System.Web;
using System.Web.Mvc;

/// <summary>
/// See http://stackoverflow.com/questions/1171035/asp-net-mvc-custom-error-handling-application-error-global-asax/5952774#5952774
/// for implementation details
/// </summary>
public class AjaxRedirectResult : RedirectResult {

    public AjaxRedirectResult(string url, ControllerContext controllerContext)
        : base(url) {
        ExecuteResult(controllerContext);
    }

    public override void ExecuteResult(ControllerContext context) {
        if (context.RequestContext.HttpContext.Request.IsAjaxRequest()) {
            JavaScriptResult result = new JavaScriptResult() {
                Script = String.Format(@"/*try{{history.pushState(null,null,window.location.href);}}
                                        catch(err){{}}*/window.location.replace('{0}');",
                                        UrlHelper.GenerateContentUrl(this.Url, context.HttpContext))
            };

            // Put the route data into temp data so we don't lose anything
            context.Controller.TempData.Clear();
            foreach (var item in context.RouteData.Values) {
                context.Controller.TempData.Add(item.Key, item.Value);
            }

            result.ExecuteResult(context);
        } else {
            base.ExecuteResult(context);
        }
    }
}

public static class AjaxRequestExtension {

    public static bool IsAjaxRequest(this HttpRequest request) {
        return (request.Headers["X-Requested-With"] != null && request.Headers["X-Requested-With"] == "XMLHttpRequest");
    }
}