ForceDownload Ajax, ASP.NET MVC

Controller.cs

public ActionResult Export(ViewModel model)
{
    var fileData = _repo.GetFile(model...);
    var serializer = new JavaScriptSerializer { MaxJsonLength = Int32.MaxValue, RecursionLimit = 100 };
    var dataJson = new DownloadAjaxResult(true)
    {
        File = fileData,
        Filename = model.Filename
    };
    return new ContentResult()
    {
        Content = serializer.Serialize(dataJson),
        ContentType = "application/json",
    };
}

download.js

forceDownload: function (response) {
    var success = false;
    var arr = response.Data.File;
    var byteArray = new Uint8Array(arr);

    try {
        var blob = new Blob([byteArray], { type: 'application/octet-stream' });

        if (navigator.msSaveBlob) {
            navigator.msSaveBlob(blob, response.Data.Filename);
        } else {
            var saveBlob = navigator.webkitSaveBlob || navigator.mozSaveBlob || navigator.saveBlob;
            if (saveBlob === undefined) throw "Not supported";
            saveBlob(blob, response.Data.Filename);
        }
        success = true;
    } catch (ex) { }

    if (!success) {
        var urlCreator = window.URL || window.webkitURL || window.mozURL || window.msURL;
        if (urlCreator) {
            var link = document.createElement('a');
            if ('download' in link) {
                try {
                    var blob1 = new Blob([byteArray], { type: 'application/octet-stream' });
                    var url1 = urlCreator.createObjectURL(blob1);
                    link.setAttribute('href', url1);

                    // Set the download attribute (Supported in Chrome 14+ / Firefox 20+)
                    link.setAttribute("download", response.Data.Filename);

                    // Simulate clicking the download link
                    var event = document.createEvent('MouseEvents');
                    event.initMouseEvent('click', true, true, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
                    link.dispatchEvent(event);
                    success = true;

                } catch (ex) { }
            }
            if (!success) {
                // Fallback to window.location method
                try {
                    var blob2 = new Blob([byteArray], { type: 'application/octet-stream' });
                    var url2 = urlCreator.createObjectURL(blob2);
                    window.location = url2;
                    success = true;
                } catch (ex) { }
            }
        }
    }

}

DownloadAjaxResult.cs

[Serializable]
public class DownloadAjaxResult
{
    public bool Success { get; set; }
    public string Message { get; set; }

    public string Filename { get; set; }
    public byte[] File { get; set; }

    public DownloadAjaxResult(bool success)
    {
        Success = success;
    }
}