Read file data from AsyncUpload?

[John]

Hi all:

I am working with this example:

http://demos.telerik.com/aspnet-ajax/upload/examples/async/webmail/defaultcs.aspx?product=asyncupload

However I do not understand how to read the file data from the uploaded files. I need to read the files into a byte array. Here is the code:

PopulateUploadedFilesList();
if (UploadedFiles != null)
{
  AttachmentRepeater.DataSource = UploadedFiles;
  AttachmentRepeater.DataBind();
  for (int i = 0; i<UploadedFiles.Count; i++)
  {
       #region get file content
       // Open a file and read the contents into a byte array.
       FileStream stream = File.OpenRead(UploadedFiles[i].FileName);
       byte[] byteData = new byte[stream.Length];
       stream.Read(byteData, 0, byteData.Length);
       stream.Close();
       // Encode the data using base64.
       string encodedData = System.Convert.ToBase64String(byteData);
     }
  }

Any and all help is greatly appreciated.

John.

[Genady Sergeev]

Hello John,

Here is how you can read an uploaded file into a byte array:

void RadAsyncUpload1_FileUploaded(object sender, Telerik.Web.UI.FileUploadedEventArgs e)
    {
        using (Stream str = e.File.InputStream)
        {
            byte[] content = new byte[str.Length];
            str.Read(content, 0, content.Length);
        }
    }

I hope that this helps.

Regards,
Genady Sergeev
the Telerik team

[John]

Thanks for your reply. Is there a way to hide the text box and just have the "Select" button visible?

[Genady Sergeev]

Hello John,

Yes, this can be achieved with the following CSS:

.RadUpload input.ruFakeInput
        {
            display: none;
        }

Regards,
Genady Sergeev
the Telerik team

[Wayne]

But how do you read the file? That is a text file, I want to read (loop each char) and append to a string.

[Vessy]

Hi Wayne,

I have just answered your support ticket on the matter. For convenience, I am copying my reply here as well:

 

You can use StreamReader in order to read the file content directly and store it in the Session:

https://docs.microsoft.com/en-us/dotnet/api/system.io.streamreader.readtoend?view=net-5.0#System_IO_StreamReader_ReadToEnd

You can pass the InputStream of the uploaded file directly to the StreamReader and store the result in the Session:

    protected void RadAsyncUpload1_FileUploaded(object sender, Telerik.Web.UI.FileUploadedEventArgs e)
    {
        using (Stream stream = e.File.InputStream)
        {
            string fileOutput = new StreamReader(e.File.InputStream).ReadToEnd();
            Session[Session.SessionID + "UploadedFile"] = fileOutput;
        }
    }

 

The stored value can be accessed after that like follow:

    private string GetPRWinSettings()
    {
        string fileOutput = "";

        if (!object.Equals(Session[Session.SessionID + "UploadedFile"], null))
        {
            fileOutput = Session[Session.SessionID + "UploadedFile"].ToString();
            //your logic here
        }

        return fileOutput;
    }

 

Regards,
Vessy
Progress Telerik