Note

• ApplicationCommands cannot be used in MVVM.
• InputBinding.CommandParameter is not DependencyProperty so cannot pass a UI.
• Use Behavior to access KeyEventArgs or MouseEventArgs.
  • KeyBinding cannot access KeyEventArgs.  * MouseBinding cannot access MouseEventArgs.
• DataTemplate is how to display an object in GUI and analogous to ToString() in CLI.
• How to make the UI thread wait until a non-UI thread is done.

await Task.Run(() => IamNonUiThread());

Best practices

• Omit Grid.Row="0" and Grid.Column="0" as they are default.
• Omit Width="*" on ColumnDefinition and Height="*" on RowDefinition as star is default.
• A rather than B
  • Use {Binding Property1} rather than {Binding Path=Property1} as Path= is optional.
  • Use attribute syntax rather than property element syntax
    • For example, use <Button Content="Content1" /> rather than <Button>Content1\<Button/>
• Bind the following method to PreviewMouseLeftButtonDown rather than MouseLeftButtonDown. MouseLeftButtonDown is never called.

void CheckIfNewVersionAvailable(object sender, MouseButtonEventArgs e)
{
    if (IsLatestVersion(...))
    {
        return;
    }

    if (MessageBox.Show("New version is available. Restart?", "", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
    {
        // Start the new version and close self.
    }

    // Not relay to the Click event.
    e.Handled = true;
}

Glossary

Name	Description
Binding source	object
Binding target	UI

How to bind with self

"{Binding RelativeSource={RelativeSource Self}}"

How to bind with another UI

<TextBox Name="TextBox1" />
<TextBox Name="TextBox2" Text="{Binding ElementName=TextBox1, Path=Text}" />

References

• Binding Sources Overview
• Binding Mode Enum