WPF初步

Mainwindow.xaml

<Window x:Class="WPF初步.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="MainWindow" Height="350" Width="525">    <Grid>        <Grid.RowDefinitions>            <RowDefinition Height="27*"/>            <RowDefinition Height="37*"/>        </Grid.RowDefinitions>        <Label Content="用户名：" HorizontalAlignment="Left" Margin="96,100,0,0" VerticalAlignment="Top" Width="70"/>        <TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="36" Margin="198,95,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="241"/>        <Label x:Name="label2" Content="" HorizontalAlignment="Left" Margin="170,29.08,0,0" VerticalAlignment="Top" Grid.Row="1"/>        <Button Content="单击" HorizontalAlignment="Left" Margin="214,82.08,0,0" VerticalAlignment="Top" Width="91" Height="27" Click="Button_Click_1" Grid.Row="1"/>    </Grid></Window>

Mainwindow.xaml.cs

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 WPF初步{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();        }        private void Button_Click_1(object sender, RoutedEventArgs e)        {            if (this.textBox1.Text == "")            {                this.label2.Foreground = Brushes.Red;                this.label2.Content = "请输入用户名！！";            }            else            {                this.label2.Foreground = Brushes.Blue;                this.label2.Content = string.Format("欢饮您，{0}!", this.textBox1.Text);            }        }    }}