这是用于返回xdocument文件的控制器代码。我将其转换为memorystream，然后将其作为base64字符串返回。

[HttpPost]
    public ActionResult ImportAcesFileAjax(TransactionViewModel transactionViewModel)
    {
        XDocument xDocument = new XDocument();
        try
        {
            if (transactionViewModel.File.IsNotNullObject())
            {
                ImportService importService = new ImportService();
                xDocument = importService.ProcessExcelFileForTransformation(transactionViewModel);
                _logger.Information($"Finished processing {transactionViewModel.File.FileName}");
            }
        }
        catch (Exception e)
        {
            _logger.Error($"Error: {e.Message}");
            _logger.Error(e.StackTrace);
            throw;
        }

        return ReturnImportXmlAsByte(xDocument, "import.xml");
    }

    protected ActionResult ReturnImportXmlAsByte(XDocument xDocument, string xmlFilename)
    {
        using (MemoryStream stream = new MemoryStream())
        using(XmlWriter xmlWriter = XmlWriter.Create(stream))
        {
            xDocument.WriteTo(xmlWriter);
            var byteLength = stream.ToArray().Length;
            var base64String = Convert.ToBase64String(stream.ToArray(), 0, byteLength);
            return Json(new {base64String = base64String, xmlFilename = xmlFilename});
        }
    }

我在前端使用以下代码：

$.ajax({
    url: requestUrl,
    type: "POST",
    data: formData,
    contentType: false,
    processData: false,
    success: function (excelByteResult) {
        var bytes = base64ToBytes(excelByteResult.base64String);
        var blob = new Blob([bytes], { type: "text/xml" });
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.style.display = 'none';
        a.href = url;
        a.download = excelByteResult.xmlFilename;
        document.body.appendChild(a);
        a.click();
        window.URL.revokeObjectURL(url);
    },
    error: function (jqXHR, textStatus, errorThrown) {
        console.log("Xhr: " + jqXHR.responseText);
        console.log("Status: " + status);
        console.log("Error Thrown: " + errorThrown);
    }
});

ajax调用成功，但我似乎无法访问该文件。除了我的方法，我们还有其他可行的方法吗？要求是通过ajax下载xml文件