Getting issue while downloading 4 to 5 gb file from blob storage.

Question

Hi i have to download a file from blob storage upto 3 to 5 gb .
Below is my code:
Label lblfilename = (Label)row.FindControl("lblGrid_filename");
    Label lblfilesize = (Label)row.FindControl("lblGrid_hidfileSize");
    string downloadfile = lblfilename.Text.ToString();
   // DownloadFileFromBlob(downloadfile, CONTAINER, ACCOUNTKEY);
    AccountFileTransfer = CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=" + ACCOUNTNAME + ";AccountKey=" + ACCOUNTKEY);
    if (AccountFileTransfer != null)
        BlobClientFileTransfer = AccountFileTransfer.CreateCloudBlobClient();
        ContainerFileTransfer = BlobClientFileTransfer.GetContainerReference(CONTAINER);
        ContainerFileTransfer.CreateIfNotExist();
        BlobRequestOptions options = new BlobRequestOptions();
        options.Timeout = new TimeSpan(0, 180, 0);
    var data = Regex.Match(lblfilesize.Text.ToString(), @"\d+").Value;
    int value32;
    Int64 value64;
    var blobSize = 0L;
    var blockSize = 0L;
    var offset = 0L;
    if (int.TryParse(data, out value32))
        blobSize = Convert.ToInt32(lblfilesize.Text.ToString());
    else if (Int64.TryParse(data, out value64))
        blobSize = Convert.ToInt64(lblfilesize.Text.ToString());
    var blob = ContainerFileTransfer.GetBlockBlobReference(downloadfile);
    var sasUrl = blob.Uri.AbsoluteUri;
    CloudBlockBlob blockBlob = new CloudBlockBlob(sasUrl);
    //blobSize = Convert.ToInt32(lblfilesize.Text.ToString());
    blockSize = 5 * 1024 * 1024;
    Response.Clear();
    Response.ContentType = "APPLICATION/OCTET-STREAM";
    System.String disHeader = "Attachment; Filename=\"" + blockBlob.Name + "\"";
    //Response.AppendHeader("Content-Disposition", disHeader);
    for (offset = 0; offset < blobSize; offset += blockSize)
        using (var blobStream = blockBlob.OpenRead())
            if ((offset + blockSize) > blobSize)
                blockSize = (blobSize - offset);
            byte[] buffer = new byte[blockSize];
            blobStream.Read(buffer, 0, buffer.Length);
            Response.BinaryWrite(buffer);
            Response.Flush();
    Response.End();
SNAPSHOT of error:
Pawan

Answer 1

Hi Will thanks per the reply
I have make some changes in the code and now i am using the v4.0.30319 azure storage for downloading and able to download a file upto 3.5 GB. Now the problem is that each file size is showing 0 KB.
Here is my code and snapshot:
  Button btndownloadrow = (Button)sender;
    GridViewRow row = (GridViewRow)btndownloadrow.NamingContainer;
    Label lblfilename = (Label)row.FindControl("lblGrid_filename");
    Label lblfilesize = (Label)row.FindControl("lblGrid_hidfileSize");
    string downloadfile = lblfilename.Text.ToString();
    CloudStorageAccount AccountFileTransfer = CloudStorageAccount.Parse("DefaultEndpointsProtocol=http;AccountName=" + ACCOUNTNAME + ";AccountKey=" + ACCOUNTKEY);
    // Create the blob client.
    CloudBlobClient BlobClientFileTransfer = AccountFileTransfer.CreateCloudBlobClient();
    // Retrieve reference to a previously created container.
    CloudBlobContainer ContainerFileTransfer = BlobClientFileTransfer.GetContainerReference("filetransfer");
    if (AccountFileTransfer != null)
        BlobClientFileTransfer = AccountFileTransfer.CreateCloudBlobClient();
        CloudBlockBlob pageBlob = ContainerFileTransfer.GetBlockBlobReference(CONTAINER);
        ContainerFileTransfer.CreateIfNotExists();
        BlobRequestOptions options = new BlobRequestOptions();
        options.ServerTimeout= new TimeSpan(0, 180, 0);
    var data = Regex.Match(lblfilesize.Text.ToString(), @"\d+").Value;
    int value32;
    Int64 value64;
    var blobSize = 0L;
    var blockSize = 0L;
    var offset = 0L;
    if (int.TryParse(data, out value32))
        blobSize = Convert.ToInt32(lblfilesize.Text.ToString());
    else if (Int64.TryParse(data, out value64))
        blobSize = Convert.ToInt64(lblfilesize.Text.ToString());
    CloudBlockBlob blob = ContainerFileTransfer.GetBlockBlobReference(downloadfile);
    var sasUrl = blob.Uri;
    CloudBlockBlob blockBlob = new CloudBlockBlob(sasUrl);
    //blobSize = Convert.ToInt32(lblfilesize.Text.ToString());
    blockSize = 4 * 1024 * 1024;
    Response.Clear();
    Response.ContentType = "APPLICATION/OCTET-STREAM";
    System.String disHeader = "Attachment; Filename=\"" + blockBlob.Name + "\"";
    Response.AppendHeader("Content-Disposition", disHeader);
   // blob.DownloadToStream(Response.OutputStream);
   // byte[] bytes = new byte[blockSize];
    for (offset = 0; offset < blobSize; offset += blockSize)
        using (var blobStream = blockBlob.OpenRead())
            if ((offset + blockSize) > blobSize)
                blockSize = (blobSize - offset);
        byte[] buffer = new byte[blockSize];
            blobStream.Read(buffer, 0, buffer.Length);
            Response.BinaryWrite(buffer);
            Response.Flush();
    Response.End();
SNAPSOT:
Please suggest me if i am missing any logic.
Pawan