Question

I have the following XAML:

<Window.Resources>
    <myApp:ImageDisplayConvertor x:Key="ImageDisplayConvertor" />
</Window.Resources>

<DataGridTemplateColumn Header="Icon">
    <DataGridTemplateColumn.CellTemplate >
        <DataTemplate>
            <Image Name="img" Source="{Binding Game,Converter={StaticResource ImageDisplayConvertor}}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

Here is my Converter code:

Public Class ImageDisplayConvertor
    Implements IValueConverter

    Public Function Convert(value As Object, targetType As System.Type, parameter As Object, culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IValueConverter.Convert
        Dim x As Integer = DirectCast(value, Integer)

        Select Case x
            Case 1 : Return My.Resources.T1
            Case 2 : Return My.Resources.T2
            Case 3 : Return My.Resources.T3_Blue
            Case 10 : Return My.Resources.SS2
            Case Else : Return My.Resources.imgError
        End Select
    End Function

    Public Function ConvertBack(value As Object, targetType As System.Type, parameter As Object, culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IValueConverter.ConvertBack
        Return value
    End Function
End Class

The resources returned are bitmaps. I know the converter class is firing because i’ve messagebox’d the variable ‘x’ and it displays the value of the integer from the ‘Game’ column of the datasource. However, my TemplateColumn remains empty:

What am I doing wrong? If I set the image source to a static uri, I see an image in the first column. But trying to bind and convert doesn’t work.

Answer 1

In your converter, try returning a BitmapImage with the bitmap uri instead of the bitmap itself:

Dim bi As New BitmapImage
bi.BeginInit()
bi.UriSource = New Uri("yourBitmap.png", UriKind.Relative)
bi.EndInit()