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Question

Is it possible to display a message or default row in a Silverlight 3 Datagrid

Answer 1

+1 A:

I would do this by switching the visibility of the datagrid off and the visibility of say a textblock on. You can do this with binding and a converter:

Converter:

public class ObjectToVisibilityConverter : IValueConverter
{
    public bool Negate { get; set; }

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    if (!Negate)
    {
        return (value == null) ? Visibility.Collapsed : Visibility.Visible;
    }
    else
    {
        return (value == null) ? Visibility.Visible :  Visibility.Collapsed;
    }
}

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    throw new NotImplementedException();
}

}

XAML:

    <UserControl.Resources>
        <xmlnsref:ObjectToVisibilityConverter x:Key="ObjectToVisibilityConverter" />
        <xmlnsref:ObjectToVisibilityConverter Negate="True" x:Key="ReversedObjectToVisibilityConverter" />
    </UserControl.Resources>
    <StackPanel>
       <data:dataGrid Visibility="{Binding MyDataSetObject, Converter={StaticResource ObjectToVisibilityConverter}}">
       ... />
       <TextBlock Text="No results found."
 Visibility="{Binding MyDataSetObject, Converter={StaticResource ReversedObjectToVisibilityConverter}}"> />
    </StackPanel>

This will hide the grid (and show the textbox) if the MyDataSetObject object is null, and vica-versa if not null (Note the Negate property on the converter that will reverse the visibility)

HTH,
Mark

Mark Cooper 2009-12-16 12:55:34

Thanks Mark, that's exactly what I ended up doing - I even came back to answer my own question a few hours after I asked it, but there's some sort of timeframe where that isn't possible so I never got round to it.The trouble is, while it's a good solution, it's not really a great answer to my question as there are no headers showing for the empty grid which there would be if a default 'empty' row was added. However it is the solution I used, so it was definitely good enough for me.

Scott 2009-12-17 02:41:25

Answer 2

A:

Instead of defining 2 separate converters in xaml, you could use a parameter like this:

Visibility="{Binding MissingDocList, Converter={StaticResource ObjectToVisibilityConverter}, ConverterParameter=False}"

and

 if (!System.Convert.ToBoolean(parameter))

in the Converter class. Just a thought...

Toby 2010-04-07 20:04:52

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Is it possible to display a message or default row in a Silverlight 3 Datagrid

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