WPF基本命令系统使用2

<Window x:Class="CommandParematerDemo.MainWindow"
        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:CommandParematerDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="26"></RowDefinition>
                <RowDefinition Height="26"></RowDefinition>
                <RowDefinition Height="26"></RowDefinition>
                <RowDefinition Height="100"></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>

            <TextBlock Text="name:" HorizontalAlignment="Left"></TextBlock>
            <TextBox Name="nameTextBox" Margin="60,0,0,0"></TextBox>
            <Button Name="tButton" Content="new teacher" Grid.Row="1" Command="New" CommandParameter="Teacher"></Button>
            <Button Name="sButton" Content="new student" Grid.Row="2" Command="New" CommandParameter="Student"></Button>
            <ListView Name="aListView" Grid.Row="3"></ListView>
        </Grid>
    </Grid>
    <Window.CommandBindings>
        <CommandBinding Command="New" CanExecute="New_canExecute" Executed="New_execute"></CommandBinding>
    </Window.CommandBindings>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace CommandParematerDemo
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        void New_canExecute(object sender, CanExecuteRoutedEventArgs e) {
            if (string.IsNullOrEmpty(nameTextBox.Text))
            {
                e.CanExecute = false;
            }
            else {
                e.CanExecute = true;
            }
        }


        void New_execute(Object sender, ExecutedRoutedEventArgs e) {
            string name = nameTextBox.Text;
            if (e.Parameter.ToString() == "Student")
            {
                aListView.Items.Add(string.Format($"New student:{name}"));
            }
            else {
                aListView.Items.Add(string.Format($"New Teacher:{name}"));
            }
        }
    }
}

界面上有两个按钮，一个用于新建teacher，一个用于新建student，都使用new命令，那么就是通过CommandParameter来区分，命令源一定是实现了ICommandResource接口的对象，而ICommandSource有一个属性就是CommandPrameter。