35.回车触发事件 C#例子 WPF例子

就是一个简单的回车触发事件的例子。在该例子中按下回车消息框会返回文本框输入的内容

C#代码：

using System.Printing;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace practice
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void TextBox_TextChanged(object sender, KeyEventArgs e)
        {
            if(e.Key == Key.Enter)
            {
                MessageBox.Show($"{textbox.Text}");
            }
        }
        //Key Event Arguments键盘事件参数

    }



    
}

Extensible Application Markup Langguage:

<Window x:Class="practice.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:practice"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid Margin="100">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <TextBox x:Name="textbox" KeyDown="TextBox_TextChanged" FontSize="87"/>
    </Grid>
</Window>