WPF命令参数CommandParameter

XAML代码如下：

<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>

相关的事件处理器代码如下所示：

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));
    }
}