Hi Ralf,
Tom hat Dir ja schon eine Variante mit CodeBehind gezeigt.
Etwas professioneller mit MVVM könnte es so aussehen. Für einen Anfänger wird es vielleicht etwas zu komplex sein, aber, wenn Du die Lösung verstehst, dann hast Du einen großen Schritt gemacht. Ansonsten ist die Lösung vielleicht als Anregung für andere
Mitleser. Um an die SelectedItems-Eigenschaft ranzukommen, habe ich ein Behavior genutzt.
XAML:
<Window x:Class="WpfApplication1.Window58"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApplication1"
mc:Ignorable="d"
Title="Window58" Height="300" Width="300">
<Window.Resources>
<local:Window58VM x:Key="vm"/>
<Style TargetType="DataGrid" >
<Setter Property="local:Window58DataGridBehavior.UseBehavior" Value="True"/>
</Style>
</Window.Resources>
<Grid DataContext="{StaticResource vm}">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<DataGrid Name="dg" ItemsSource="{Binding View}" />
<Button Grid.Row="1" Content="Anzeige" Command="{Binding Cmd}"/>
</Grid>
</Window>
ViewModel dazu:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Interactivity;
namespace WpfApplication1
{
public class Window58VM : INotifyPropertyChanged
{
#region Properties
private CollectionViewSource cvs;
public ICollectionView View
{
get
{
if (cvs == null) cvs = new CollectionViewSource() { Source = col };
return cvs.View;
}
}
public IList SelectedCol { get; set; }
public ICommand Cmd { get { return new RelayCommand(CmdExec); } }
private void CmdExec(object obj)
{
string msg = string.Empty;
foreach (Window58Data item in SelectedCol) { msg += $"{item.ID}: {item.Info}{Environment.NewLine}"; }
MessageBox.Show(msg);
}
private IEnumerable<Window58Data> col
{
get
{
ObservableCollection<Window58Data> liste = new ObservableCollection<Window58Data>();
for (int i = 1; i < 100; i++) { yield return new Window58Data() { ID = i, Info = $"Name {i}" }; }
}
}
#endregion
#region OnPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged([CallerMemberName] string propName = "") =>
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
#endregion
}
public class Window58Data
{
public int ID { get; set; }
public String Info { get; set; }
}
public class Window58DataGridBehavior : Behavior<DataGrid>
{
public static DependencyProperty UseBehaviorProperty =
DependencyProperty.RegisterAttached("UseBehavior", typeof(Boolean),
typeof(Window58DataGridBehavior),
new UIPropertyMetadata(false, OnUseBehaviorChanged));
public static bool GetUseBehavior(DependencyObject obj) { return (bool)(obj.GetValue(UseBehaviorProperty)); }
public static void SetUseBehavior(DependencyObject obj, bool value) { obj.SetValue(UseBehaviorProperty, value); }
private static void OnUseBehaviorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue.Equals(true)) Interaction.GetBehaviors(d).Add(new Window58DataGridBehavior());
}
protected override void OnAttached()
{
base.OnAttached();
var dg = this.AssociatedObject;
((Window58VM)dg.DataContext).SelectedCol = dg.SelectedItems;
}
protected override void OnDetaching() { base.OnDetaching(); }
}
}
--
Viele Grüsse
Peter Fleischer (ehem. MVP)
Meine Homepage mit Tipps und Tricks
