目前在原分頁透過form post的方式，會開啟新分頁，並且載入報表PDF檔；但在報表完成之前，原分頁發出的請求都會等到報表完成後才執行。

嘗試將產生PDF的Function改為非同步的方式，仍舊是沒有改善；希望能在載入報表的同時又不影響其他操作，還請各位指教～

public async Task<ActionResult> Print0304(BCSTD0304QueryViewModel ViewModel)
{
    /*
    略
    */
    byte[] renderedBytes = await fileUtils.CreateReportTobyteAsync(reportPath, data, "1", reportParameters);
    Response.AppendHeader("Content-Disposition", "inline; filename=\"" + filename + "\"");
    return File(renderedBytes, FileUtils.getContentType(filename));
}

public Task<byte[]> CreateReportTobyteAsync(string reportPath, IList data, string type, ReportParameter[] reportParameterCollection = null)
{
    /*
    略
    */
    Task<byte[]> task = Task<byte[]>.Factory.StartNew(() =>
    {
        return renderedBytes = localReport.Render(reportType, null, out mimeType, out encoding, out fileNameExtension, out streams, out warnings);
    });
    return task;
}