将DataGrid可见性与其自身绑定（ItemSource.Count> 0）Silverlight MVVM

Question

如标题所示，当网格的itemsource有0行时，我想隐藏网格。

<sdk:DataGrid Name="RegionDataGrid" Visibility="{Binding <!-- WHAT_SHOULD_COME_HERE -->}" AutoGenerateColumns="False" VerticalAlignment="Top" IsReadOnly="False" Height="Auto" Width="Auto" >

Answer 1

First you need a converter which will return Collapsed when List is empty.

public class EmptyCollectionConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        ICollection list = (ICollection)value;

        if (list == null)
            return Visibility.Collapsed;

        return list.Count != 0 ? Visibility.Visible : Visibility.Collapsed;
    }

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

Then you can use RelativeSource binding with value Self to bind the ItemsSource,

<sdk:DataGrid Visibility="{Binding ItemsSource, RelativeSource={RelativeSource Self}, Converter={StaticResource EmptyCollectionConverter}}" />