重新打开时,从azure下载PDF无法加载

Question

我试图从内存流中的azure的blob存储中下载pdf文件.但是,当我尝试打开文件时,它不会加载.

这是我正在使用的代码. 下载代码

    protected void blobDownload_Click(object sender, EventArgs e)
    {
        //Getting the blob storage container values
        DBAccess dbaCon = new DBAccess();
        DataTable dt = dbaCon.GetTrainingRecord(TrainingTrainingRecordID.Value);
        string companyID = dt.Rows[0].Field<string>("fk_company_id");
        string blobStorageName = dt.Rows[0].Field<string>("uploaded_file");
        string filename = dt.Rows[0].Field<string>("display_file_name");

        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);
        blockBlob.FetchAttributes();
        HttpResponse response = HttpContext.Current.Response;
        //response.ContentType = blockBlob.Properties.ContentType;
        response.ContentType = "application/pdf";
        response.AddHeader("Content-Disposition", "Attachment; filename=" + filename);
        response.AddHeader("Content-Length", blockBlob.Properties.Length.ToString());
        response.BinaryWrite(memStream.ToArray());
    }

基本上上面的代码是在按钮点击时触发的,文件是通过浏览器下载的,但是当试图打开文件时无法加载.我已经检查了天蓝色的门户网站,我可以通过天蓝色的门户网站直接下载文件,文件很好.

我试图直接设置内容类型,这似乎不起作用.

Pdf文件似乎是我用.jpg和.png文件测试的唯一不起作用的文件,它下载并打开正常.

谢谢

更新

问题大多已经解决,因为这是我上传文件的方式的问题.由于我需要唯一地存储文件,我不得不更改blob存储中的名称以克服这个问题我使用了.SaveAs()下面的函数.

上传代码

    private void uploadFile(string blobContainer, string randomFileName)
    {
        // Retrieve storage account from connection string.
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
            CloudConfigurationManager.GetSetting("StorageConnectionString"));

        // Create the blob client.
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

        // Retrieve reference to a previously created container.
        CloudBlobContainer container = blobClient.GetContainerReference(blobContainer);

        // Create the container if it doesn't already exist.
        container.CreateIfNotExists();

        // Retrieve reference to a blob named "randomFileName".
        CloudBlockBlob blockBlob = container.GetBlockBlobReference(randomFileName);

        filMyFile.PostedFile.SaveAs(Server.MapPath("~/") + randomFileName);

        // Create or overwrite the "myblob" blob with contents from a local file.
        using (filMyFile.PostedFile.InputStream)
        {
            blockBlob.UploadFromStream(filMyFile.PostedFile.InputStream);
        }
    }

该文件在Edge和chrome中下载得很好但是在firefox中名称缩短并且文件扩展名丢失.以下是显示该问题的屏幕截图.

Answer 1

根据我的测试,您的代码在我身边正确运行.PDF应该与其他blob没有区别.由于azure blob存储上没有文件类型,因此它只是一个blob名称.扩展类型以OS而闻名.

我建议你可以下载名为xxx.pdf的文件.一般我们还需要PDF阅读器来阅读pdf文件.如果安装了Microsoft Edge浏览器,则可以直接打开.pdf文件.

更新:

因为firefox可以将其配置为直接保存文件然后它应该工作.