Demo1 触发事件

<Window x:Class="WPFExample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="WPF Example" Height="600" Width="800">
    <Grid>
        <TextBlock x:Name="txtTotal" Text="计算结果" Visibility="Hidden"/>
        <StackPanel>
            <Button  Content="Click me" Height="30" Width="200" Click="Button_Click" HorizontalAlignment="Center" Background="#FFE8DD2C" BorderBrush="#FF3E94ED" MouseEnter="Button_Mouse_Enter" MouseLeave="Button_Mouse_Leave"/>
        </StackPanel>
    </Grid>
</Window>

using System;
using System.Windows;

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

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            int num1 = 10;
            int num2 = 20;
            int total=num1 + num2;

            txtTotal.Text=total.ToString();
            txtTotal.Visibility=Visibility.Visible;
        }

        private void Button_Mouse_Enter(object sender, System.Windows.Input.MouseEventArgs e)
        {
            txtTotal.Text = "鼠标进入这个范围了";
            txtTotal.Visibility = Visibility.Visible;
        }

        private void Button_Mouse_Leave(object sender, System.Windows.Input.MouseEventArgs e)
        {
            txtTotal.Text = "鼠标移出这个范围了";
            txtTotal.Visibility = Visibility.Visible;
        }
    }
}