How to use command bindings in user controls in wpf?
- by Sam
In MainWindow the commandbinding works fine.
In UserControl1 it doesnt work. Note the datacontext is set correctly as is evidenced by the content of the button which is the result of a binding.
I am not trying to bind the command in the usercontrol to a command in mainwindow or any other such trickery. I am just trying to replicate what I did in MainWindow in UserControl1.
// MainWindow xaml
<StackPanel>
<Button Content="Click Here" Command="{Binding ClickHereCommand}" Height="25" Width="90"></Button>
<local:UserControl1></local:UserControl1>
</StackPanel>
// MainWindow
public partial class MainWindow : Window
{
public static RoutedCommand ClickHereCommand { get; set; }
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
ClickHereCommand = new RoutedCommand();
CommandBindings.Add(new CommandBinding(ClickHereCommand, ClickHereExecuted));
}
public void ClickHereExecuted(object sender, ExecutedRoutedEventArgs e)
{
System.Windows.MessageBox.Show("hello");
}
}
// UserControl1 xaml
<UserControl x:Class="CommandBindingTest.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" x:Name="root">
<Grid DataContext="{Binding ElementName=root}" >
<Button Content="{Binding ButtonContent}" Command="{Binding ClickHereCommand}" Height="25" Width="90"></Button>
</Grid>
</UserControl>
// UserControl1
public partial class UserControl1 : UserControl, INotifyPropertyChanged
{
private string _ButtonContent;
public string ButtonContent
{
get { return _ButtonContent; }
set
{
if (_ButtonContent != value)
{
_ButtonContent = value;
OnPropertyChanged("ButtonContent");
}
}
}
public static RoutedCommand ClickHereCommand { get; set; }
public UserControl1()
{
InitializeComponent();
ClickHereCommand = new RoutedCommand();
CommandBindings.Add(new CommandBinding(ClickHereCommand, ClickHereExecuted));
ButtonContent = "Click Here";
}
public void ClickHereExecuted(object sender, ExecutedRoutedEventArgs e)
{
System.Windows.MessageBox.Show("hello from UserControl1");
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string name)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
#endregion
}
