C# 如何从azure下载文件'；s blob存储

我正在尝试使用jquery的$.ajax（）方法从azure的blob存储下载一个文件

我正在使用下面的c代码下载blob，我认为问题出在这里

  [System.Web.Services.WebMethod]
        public static void DownLoadBlob(string blobStorageName, string companyID)
        { 
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
                CloudConfigurationManager.GetSetting("StorageConnectionString"));
            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer container = blobClient.GetContainerReference(System.Text.RegularExpressions.Regex.Replace(companyID.ToLower(), @"\s+", ""));
            CloudBlockBlob blockBlob = container.GetBlockBlobReference(blobStorageName);
            MemoryStream memStream = new MemoryStream();
            blockBlob.DownloadToStream(memStream);
            HttpResponse response = HttpContext.Current.Response;
            response.ContentType = blockBlob.Properties.ContentType;
            response.AddHeader("Content-Disposition", "Attachment; filename=" + blobStorageName.ToString());
            response.AddHeader("Content-Length", blockBlob.Properties.Length.ToString());
            response.BinaryWrite(memStream.ToArray());
        }

上面的代码由以下ajax调用触发

  var objRecordJSON = JSON.parse(response.d);
                $.ajax({
                    type: "POST",
                    url: "FroalaImageUpload.aspx/DownLoadBlob",
                    data: '{"blobStorageName":"' + objRecordJSON[0].uploaded_file + '", ' +
                    '"companyID" : "' + $("#trainingcompanyid").val() + '" }',
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (response) {

                    },
                    failure: function (response) {

                    }
                });

我的服务器端c#代码有一个断点，它正在命中这段代码。但是，该文件不会在客户端下载。我也没有在控制台中得到任何错误

任何帮助或建议都将不胜感激

谢谢

我正在尝试使用jquery的$.ajax（）方法从azure的blob存储下载一个文件

抱歉，我们无法通过Ajax调用直接下载文件。我假设您可以创建一个WebForm页面，并将用于输出blob文件的代码移动到

页面加载

，并利用querystring传递参数，如下所示：

protected void Page_Load(object sender, EventArgs e)
{
    var blobStorageName = Request.QueryString["blobStorageName"];
    var companyID = Request.QueryString["companyID"];
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(Microsoft.Azure.CloudConfigurationManager.GetSetting("StorageConnectionString"));
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    CloudBlobContainer container = blobClient.GetContainerReference(System.Text.RegularExpressions.Regex.Replace(companyID.ToLower(), @"\s+", ""));
    CloudBlockBlob blockBlob = container.GetBlockBlobReference(blobStorageName);
    System.IO.MemoryStream memStream = new System.IO.MemoryStream();
    blockBlob.DownloadToStream(memStream);
    HttpResponse response = HttpContext.Current.Response;
    response.ContentType = blockBlob.Properties.ContentType;
    response.AddHeader("Content-Disposition", "Attachment; filename=" + blobStorageName.ToString());
    response.AddHeader("Content-Length", blockBlob.Properties.Length.ToString());
    response.BinaryWrite(memStream.ToArray());
}

window.location = "/FroalaImageUpload.aspx?blobStorageName=2017%2F11%2F7%2F2017-7-10-1.png&companyID=images";

然后，对于您的客户端，您可以按如下方式下载该文件：

protected void Page_Load(object sender, EventArgs e)
{
    var blobStorageName = Request.QueryString["blobStorageName"];
    var companyID = Request.QueryString["companyID"];
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(Microsoft.Azure.CloudConfigurationManager.GetSetting("StorageConnectionString"));
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    CloudBlobContainer container = blobClient.GetContainerReference(System.Text.RegularExpressions.Regex.Replace(companyID.ToLower(), @"\s+", ""));
    CloudBlockBlob blockBlob = container.GetBlockBlobReference(blobStorageName);
    System.IO.MemoryStream memStream = new System.IO.MemoryStream();
    blockBlob.DownloadToStream(memStream);
    HttpResponse response = HttpContext.Current.Response;
    response.ContentType = blockBlob.Properties.ContentType;
    response.AddHeader("Content-Disposition", "Attachment; filename=" + blobStorageName.ToString());
    response.AddHeader("Content-Length", blockBlob.Properties.Length.ToString());
    response.BinaryWrite(memStream.ToArray());
}

window.location = "/FroalaImageUpload.aspx?blobStorageName=2017%2F11%2F7%2F2017-7-10-1.png&companyID=images";

---

此外，您还可以利用

iframe

下载文件。您可以参考类似的详细信息。

您只是想在客户端计算机上下载文件，还是想在JS代码中处理数据？如果是前者，那么有一个更简单的方法。你真的不需要AJAX。是的，我只是想在客户端计算机上下载文件。嗨，谢谢你的回答。我通过使用一个

元素解决了这个问题，该元素有一个指向我的下载函数的onclick事件。你是对的，我不能通过AJAX调用直接下载文件。