Problem with radupload inside a radgrid

[Arturo]

Hi guys, i'm new with this topic and i need your help.

I know how to edit info inside a grid (now i'm using popup mode) and it works. But my boss asked me to change a field (logo picture converted into base64 string ) and i needed to use the radupload control inside the grid.

I've added it manually and it appears without problems but i don't know how to get this file to convert it into base64 string... could you help me with this? thanks a lot!

This is the code i'm using into the grid

<telerik:GridAttachmentColumn FileName="NuevoLogoFN"
    FilterControlAltText="Filter Nuevo Logo column" HeaderText="Nuevo Logotipo"
    Text="Nuevo Logotipo" UniqueName="NuevoLogo">
</telerik:GridAttachmentColumn>

And this one is part of the codebehind

if (e.CommandName == RadGrid.UpdateCommandName)
      {

          //GridDataItem item = (GridDataItem)e.Item;
          GridEditFormItem item = (GridEditFormItem)e.Item;


          Hashtable newValues = new Hashtable();

          item.ExtractValues(newValues);


         //I need the code here


          string id = item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["ID_Reg"].ToString();

[Radoslav]

Hi Arturo,

To achieve the desired functionality you could try using the following code snippet:

void RadGrid1_UpdateCommand(object sender, GridCommandEventArgs e)
    {
        ...

        UploadedFile uploadedFile = ((e.Item as GridEditFormItem)["NuevoLogo"].Controls[0] as RadUpload).UploadedFiles[0];

        byte[] bytes = new byte[uploadedFile.InputStream.Length];
        int numBytesToRead = (int)uploadedFile.InputStream.Length;
        int numBytesRead = 0;
        while (numBytesToRead > 0)
        {
            int n = uploadedFile.InputStream.Read(bytes, numBytesRead, 10);
            if (n == 0)
            {
                break;
            }
            numBytesRead += n;
            numBytesToRead -= n;
        }

        uploadedFile.InputStream.Close();

        string base64String = Convert.ToBase64String(bytes);
    }

Please give it try and let me know if it helps you.

Kind regards,
Radoslav
the Telerik team

[Arturo]

It's excellent! thanks a lot!  but now i have another question related to this topic.... how can i detect that this new control (uploadedFile) has a file? this because i wanna validate if the user wants to change the logo o wants to keep the old one.  thanks!

[Casey]

Hi Arturo,

You could modify the solution provided by Radoslav as follows: 

I hope this helps!
Casey

RadUpload uploader = (e.Item as GridEditFormItem)["NuevoLogo"].Controls[0] as RadUpload;

 if (uploader.UploadedFiles.Count > 0)
 {
 UploadedFile uploadedFile = uploader.UploadedFiles[0];

 byte[] bytes = new byte[uploadedFile.InputStream.Length];
 int numBytesToRead = (int)uploadedFile.InputStream.Length;
 int numBytesRead = 0;
 while (numBytesToRead > 0)
 {
     int n = uploadedFile.InputStream.Read(bytes, numBytesRead, 10);
     if (n == 0)
     {
         break;
     }
     numBytesRead += n;
     numBytesToRead -= n;
 }

 uploadedFile.InputStream.Close();

 string base64String = Convert.ToBase64String(bytes);
 }

[Arturo]

Thanks for the soon response, it won't worked but if I use  

if ( ((e.Item as GridEditFormItem)["NuevoLogo"].Controls[0] as RadUpload).UploadedFiles.Count > 0)
{
.....
}

it's the way i need to use this control.  Thanks a lot!


[UPDATE]

I forgot something important.... is there anyway to show this encoded image in the radgrid???

[Radoslav]

Hello Arturo,

You could convert the image from base64 string to byte array and use the GridTemplateColumn with RadBinaryImage or GridBinaryImageColumn. I am sending you a simple example which demonstrates the described approach.

I hope this helps.

Greetings,
Radoslav
the Telerik team

[Arturo]

I'm pretty confused...how can i do it if i charge the radgrid without codebehind??