[英]Turning a WPF DataGrid background image on and off?
我有一個DataGrid,當它為空時,我希望顯示一個背景圖像。 當填充DataGrid時,我希望圖像消失,並在再次清除DataGrid時重新出現。
這是通過XAML還是C#實現的?
if(myDataGridView.Rows.Count == 0) {
dataGrid.Background = new ImageBrush("exampleImage.png");
}
else {
// it is not empty
}
如果您使用的是MVVM設計模式,通常應該避免使用代碼隱藏。 在XAML中執行此操作非常簡單:
將一個Image元素放在數據網格上(將兩者放在一個Grid中並將Image放在DataGrid下面),然后使用新轉換器將Image的Visibility屬性綁定到DataGrid的Items.Count屬性:
<Grid>
<Grid.Resources>
<local:GridCountToVisibilityConverter x:Key="GridCountToVisibilityConverter"/>
</Grid.Resources>
<DataGrid x:Name="grid"/>
<Image Source="image.jpg" Visibility="{Binding ElementName=grid, Path=Items.Count, Converter={StaticResource GridCountToVisibilityConverter}}" />
</Grid>
轉換器看起來像這樣:
public class GridCountToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var count = (int)value;
return count == 0? Visibility.Visible : Visibility.Collapsed;
}
}
我假設您正在使用WPF,使用Windows表單將非常困難。
System.Windows.Controls.DataGrid dataGrid = new System.Windows.Controls.DataGrid();
public void Initialize()
{
dataGrid.Loaded += new System.Windows.RoutedEventHandler(dataGrid_Loaded);
dataGrid.Unloaded += new System.Windows.RoutedEventHandler(dataGrid_Unloaded);
// Show image right away.
this.dataGrid_Unloaded(null, null);
}
void dataGrid_Unloaded(object sender, System.Windows.RoutedEventArgs e)
{
// Provide some image here.
dataGrid.Background = new System.Windows.Media.ImageBrush();
}
void dataGrid_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
dataGrid.Background = System.Windows.Media.Brushes.Gray;
}
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