how to delete selected row in datagrid using delete key with fixed column
I have used code with command.manager event but it didn't delete the row if i use key down event it executes but it didn't delete the row in data grid.
<Window x:Class="datagridcheck.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="1336" Width="937">
<Grid Name="grid1" Margin="10,10,135,10">
<DataGrid x:Name="dgUsers" SelectionMode="Single" SelectionUnit="CellOrRowHeader" CommandManager.PreviewExecuted="DriversDataGrid_PreviewDeleteCommandHandler" Margin="174,0,346,0" GridLinesVisibility="None" MinColumnWidth="50" FontFamily="Times New Roman" HorizontalGridLinesBrush="#FFF70000" VerticalGridLinesBrush="#FF0017FF" RowBackground="#FFF5F2D4" FontSize="18" TextOptions.TextHintingMode="Animated" TextOptions.TextFormattingMode="Display" RowDetailsVisibilityMode="Visible" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Top" Width="264" Height="483" IsSynchronizedWithCurrentItem="False" SelectedIndex="0" PreviewKeyDown="dgUsers_PreviewKeyDown" >
<DataGrid.Columns>
<DataGridTextColumn Header="FoodName" Width="90" Binding="{Binding FoodName}" MinWidth="90" Foreground="#FFFB1005" FontFamily="Times New Roman"/>
<DataGridTextColumn Header="Quantity" Width="90" Binding="{Binding Birthday}" MinWidth="90" Foreground="Red" FontFamily="Times New Roman" />
<DataGridTextColumn Binding="{Binding Id}" ClipboardContentBinding="{x:Null}" Header="Price" MinWidth="90" Width="90"/>
</DataGrid.Columns>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Setter Property="Background" Value="LightBlue" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Blue"/>
<Setter Property="Foreground" Value="White"/>
</Trigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
</DataGrid>
<Button Content="Button" HorizontalAlignment="Left" Margin="443,378,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
<WrapPanel Height="355" Margin="443,0,0,0" VerticalAlignment="Top" Name="wrap1" HorizontalAlignment="Left" Width="331">
<WrapPanel Height="100" Width="100"/>
</WrapPanel>
<Button Content="Button" HorizontalAlignment="Left" Margin="443,428,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click_1"/>
<GridView>
<GridViewColumn Header="FoodName" Binding="{Binding FoodName}"/>
<GridViewColumn Header="Birthday" />
</GridView>
</Grid>
</Window>
namespace datagridcheck { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } int i = 0; private void Button_Click(object sender, RoutedEventArgs e) { Button bt = new Button(); bt.Name = "test"; bt.Content="eachtime"+ i.ToString(); bt.Width = 50; bt.Height = 50; i++; wrap1.Children.Add(bt); bt.Click += new RoutedEventHandler(this.bt_Click); } void bt_Click(object sender, RoutedEventArgs e) { Button buts = sender as Button; dgUsers.Items.Add(new User() { Id = 1, FoodName = Convert.ToString(buts.Content), Birthday = Convert.ToString(buts.Name) }); } private void DriversDataGrid_PreviewDeleteCommandHandler(object sender, ExecutedRoutedEventArgs e) { if (e.Command == DataGrid.DeleteCommand) { if (!(MessageBox.Show("Are you sure you want to delete?", "Please confirm.", MessageBoxButton.YesNo) == MessageBoxResult.Yes)) { e.Handled = true; } } } } public class User { public int Id { get; set; } public string FoodName { get; set; } public string Birthday { get; set; } } }
Quickly MVVM = Model(Data) + View(Screens) + ViewModel(Code+logic)
First XAML :
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<DataGrid x:Name="gd" CanUserDeleteRows="False" ItemsSource="{Binding DataVMs}" SelectedItem="{Binding SelectedItemInVM, Mode=TwoWay}" AutoGenerateColumns="False" IsSynchronizedWithCurrentItem="True">
<DataGrid.InputBindings>
<KeyBinding Gesture="Delete" Key="Delete" Command="{Binding DeleteCommand, Mode=OneWay}" CommandParameter="{Binding Path=SelectedItem, ElementName=gd, Mode=OneWay}"/>
</DataGrid.InputBindings>
<DataGrid.Columns>
<DataGridTextColumn Header="One" Binding="{Binding Un}" />
<DataGridTextColumn Header="Two" Binding="{Binding Deux}" />
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
In code Behind of MainWindow add this, assuming DataViewModel wrapps your model:
public MainWindow()
{
InitializeComponent();
//Initialize DataContext with some Data
var dataContext = new DataViewCollectionModel
{
DataVMs = new ObservableCollection<DataViewModel>()
};
dataContext.DataVMs.Add(new DataViewModel { Un = 1, Deux = 2 });
dataContext.DataVMs.Add(new DataViewModel { Un = 10, Deux = 20 });
dataContext.DataVMs.Add(new DataViewModel { Un = 100, Deux = 200 });
//Assign
DataContext = dataContext;
}
Now create You ViewModels :
1) BindableObject handles the notifications, it's the base class of all Viewmodels:
public class BindableObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
DataViewCollectionModel is what you pass to the DataContext of your View (In this case MainWindow). it must notify changes. that's why it inherits BindableObject. and it has a list of DataViewModel.
class DataViewCollectionModel : BindableObject
{
private ObservableCollection<DataViewModel> dataVMs;
private DataViewModel selectedItemInVM;
public ObservableCollection<DataViewModel> DataVMs
{
get { return dataVMs; }
set
{
if (dataVMs != value)
{
dataVMs = value;
NotifyPropertyChanged("DataVMs");
}
}
}
public DataViewModel SelectedItemInVM
{
get { return selectedItemInVM; }
set
{
if (selectedItemInVM != value)
{
selectedItemInVM = value;
NotifyPropertyChanged("SelectedItemInVM");
}
}
}
private RelayCommand<DataViewModel> deleteCommand;
public RelayCommand<DataViewModel> DeleteCommand
{
get { return deleteCommand ?? (deleteCommand = new RelayCommand<DataViewModel>(d => Delete(d))); }
}
private void Delete(DataViewModel d)
{
DataVMs.Remove(selectedItemInVM);
}
}
and finaly, your DataViewModel wich represents each row in the DataGrid.
public class DataViewModel : BindableObject
{
public int Un { get; set; }
public int Deux { get; set; }
}
And as I am very friendly, I give you a helper that handles commands :
public class RelayCommand<T> : ICommand
{
readonly Action<T> _execute = null;
readonly Predicate<T> _canExecute = null;
public RelayCommand(Action<T> execute)
: this(execute, null)
{
}
public RelayCommand(Action<T> execute, Predicate<T> canExecute)
{
if (execute == null)
throw new ArgumentNullException("execute");
_execute = execute;
_canExecute = canExecute;
}
public bool CanExecute(object parameter)
{
return _canExecute == null ? true : _canExecute((T)parameter);
}
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
public void Execute(object parameter)
{
_execute((T)parameter);
}
}
To test just click Delete key when you select a Row.
Hope it helps.
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