WPF命令参数CommandParameter

<Window x:Class="Demo006.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="240" Width="360" WindowStyle="ToolWindow">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="24" />
<RowDefinition Height="4" />
<RowDefinition Height="24" />
<RowDefinition Height="4" />
<RowDefinition Height="24" />
<RowDefinition Height="4" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<TextBlock  Grid.Row="0" Text="Name:" VerticalAlignment="Center" HorizontalAlignment="Left" />
<TextBox Grid.Row="0" Name="NameTextBox" Margin="60,0,0,0" />
<Button Grid.Row="2" Content="New Teacher" Command="New" CommandParameter="Teacher" />
<Button Grid.Row="4" Content="New Student" Command="New" CommandParameter="Student" />
<ListBox Grid.Row="6" Name="NewItemListBox" Height="117" VerticalAlignment="Bottom" />
</Grid>
<Window.CommandBindings>
<CommandBinding Command="New"
CanExecute="CommandBinding_CanExecute"
Executed="CommandBinding_Executed" />
</Window.CommandBindings>
</Window>

private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
if (string.IsNullOrEmpty(this.NameTextBox.Text) == true) e.CanExecute = false;
else e.CanExecute = true;
}

private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
{
string name = this.NameTextBox.Text;
if (e.Parameter.ToString() == "Teacher")
{
this.NewItemListBox.Items.Add(string.Format("New Teacher: {0}， 学而不厌，诲人不倦。", name));
}
else if (e.Parameter.ToString() == "Student")
{
this.NewItemListBox.Items.Add(string.Format("New Student: {0}，好好学习，天天向上。", name));
}
}