一、了解WPF的框架结构

（第一小节随便看下就可以，简单练习就行）

1、新建WPF项目

xmlns：XML的命名空间

Margin外边距：左上右下

HorizontalAlignment：水平位置

VerticalAlignment：垂直位置

2、Border的使用

效果：

3、LoginWindow窗口

在Wpf中不是所有的标签都有Name属性，但是一定有x:Name，x:Name为了保证所有标签的唯一性

PasswordBox是密码框

winform中窗体的加载事件：Load，WPF中窗体的加载事件是Loaded

代码：

LoginWindow.xaml的代码

<Window x:Class="WpfApp1.LoginWindow"
        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:WpfApp1"
        mc:Ignorable="d"
        Title="LoginWindow" Height="450" Width="800" Loaded="Window_Loaded">
    <Border BorderBrush="Green" BorderThickness="3" CornerRadius="10">
        <!--BorderBrush:边框的颜色  BorderThickness:边框的厚度/粗细  CornerRadius:边框四个角的半径-->
        <Grid>
        <TextBlock HorizontalAlignment="Left" Margin="213,150,0,0" TextWrapping="Wrap" Text="账号" VerticalAlignment="Top"/>
        <TextBlock HorizontalAlignment="Left" Margin="213,200,0,0" TextWrapping="Wrap" Text="密码" VerticalAlignment="Top" RenderTransformOrigin="-0.067,-2.57"/>
        <TextBox Name="txtUserCount" HorizontalAlignment="Left" Height="23" Margin="306,149,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="208"/>
            <Button  Name="btnLogin" Content="登录" HorizontalAlignment="Left" Margin="230,268,0,0" VerticalAlignment="Top" Width="75" Click="BtnLogin_Click"/>
        <Button Name="btnClose" Content="关闭" HorizontalAlignment="Left" Margin="351,267,0,0" VerticalAlignment="Top" Width="75"/>
            <PasswordBox x:Name="txtUserPwd" HorizontalAlignment="Left" Margin="306,200,0,0" VerticalAlignment="Top" Width="208" Height="23"/>
            <DataGrid HorizontalAlignment="Left" Height="100" Margin="372,430,0,-115.6" VerticalAlignment="Top" Width="100"/>
            <!--在Wpf中不是所有的标签都有Name属性，但是一定有x:Name，x:Name为了保证所有标签的唯一性-->
        </Grid>
    </Border>
</Window>

LoginWindow.xaml.cs的代码

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.Shapes;

namespace WpfApp1
{
    /// <summary>
    /// LoginWindow.xaml 的交互逻辑
    /// </summary>
    public partial class LoginWindow : Window
    {
        public LoginWindow()
        {
            InitializeComponent();
        }

        private void BtnLogin_Click(object sender, RoutedEventArgs e)
        {
            string userAccount = txtUserCount.Text;
            string userPwd = txtUserPwd.Password;
            //this.txtUserPwd.SecurePassword;//加密字符串，保存成内存地址
            MainWindow mainWindow = new MainWindow();
            mainWindow.Show();
            this.Close();
        }
        /// <summary>
        /// 窗体加载事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {

        }
    }
}

效果图：

4、文本框旋转

选中文本框，鼠标放到文本框的四个角的任意一个边上，然后旋转即可

默认的文本框有如下属性：

旋转后的文本框：

5、关闭主窗体，其他窗体不关

MainWindow界面:

MainWindow.xaml代码：

<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="311,163,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" RenderTransformOrigin="0.5,0.5">
           <!--transform:使改变、使转换 render:提供 scale:天平 skew:歪曲 rotate:旋转 translate:翻译、转变、变为-->
            <TextBox.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform Angle="25.259"/>
                    <TranslateTransform/>
                </TransformGroup>
            </TextBox.RenderTransform>
        </TextBox>
        <Button Content="返回" HorizontalAlignment="Left" Margin="318,288,0,0" VerticalAlignment="Top" Width="116" Height="41" Click="Button_Click"/>
        <Button x:Name="btnClose" Content="关闭" HorizontalAlignment="Left" Margin="562,288,0,0" VerticalAlignment="Top" Width="137" Height="41" Click="BtnClose_Click"/>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="81,158,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" RenderTransformOrigin="0.5,0.5">
            <TextBox.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform Angle="16.461"/>
                    <TranslateTransform/>
                </TransformGroup>
            </TextBox.RenderTransform>
        </TextBox>
    </Grid>
</Window>

MainWindow.xaml.cs代码：

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 WpfApp1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        //返回按钮
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            LoginWindow loginWindow = new LoginWindow();
            loginWindow.Show();
            this.Close();
        }
        //关闭按钮
        private void BtnClose_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();//关闭应用程序，杀死进程
            
        }
    }
}