DataTypeConverter on a GridViewImageColumn

[Philippe]

Hello,
I seem to have a problem on my GridView : I add a column and specify its datatypeconverter this way :

Dim col As New GridViewTextBoxColumn("Code", "Code")
col.DataTypeConverter = New CodePluginConverter()
gvHistorique.Columns.Insert(0, col)

It works fine, the CanConvert and Convert methods are called as expected

However, what I need is an image column. If I change the previous code to this :

Dim col As New GridViewImageColumn("Code", "Code")
col.DataTypeConverter = New CodePluginConverter()
gvHistorique.Columns.Insert(0, col)

All my column's cells remain empty, and I never step in any of the TypeConverter's methods.

Is there anything obvious I don't see ? (I'm using the Q3 2011 version of the controls)

Thanks in advance !

[Svett]

Hello Philippe,

Presently, the GridViewImageColumn does not support a custom type converter. I added this request to our public issue tracking system. It will be addressed in one of the next releases. In the meantime, you can create a custom image cell where you can place your conversion logic:

public class CustomGridImageCellElement : GridImageCellElement
{
    public CustomGridImageCellElement(GridViewColumn col, GridRowElement row)
        : base(col, row)
    {

    }

    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(GridImageCellElement);
        }
    }

    protected override void SetContentCore(object value)
    {
        Image image = null;
        // You should place your conversion logic here based on the value
        this.Image = image;
    }
}

You should replace the default cell instances in the CreateCell event:

void radGridView1_CreateCell(object sender, GridViewCreateCellEventArgs e)
{
    if (e.CellType == typeof(GridImageCellElement))
    {
        e.CellType = typeof(CustomGridImageCellElement);
    }
}

I updated your Telerik points.

Kind regards,
Svett
the Telerik team

SP1 of Q3’11 of RadControls for WinForms is available for download (see what's new).

[Philippe]

OK thanks for the answer :)