WPF实现登录页面设计

news2024/9/29 13:17:10

1、文件架构
在这里插入图片描述

2、CommandBase.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace CourseManagement.Common
{
    public class CommandBase : ICommand
    {
        public event EventHandler CanExecuteChanged;

        public bool CanExecute(object parameter)
        {
            return DoCanExecute?.Invoke(parameter)==true;
        }

        public void Execute(object parameter)
        {
            DoExecute?.Invoke(parameter);
        }

        public Action<object> DoExecute { get; set; }

        public Func<object,bool> DoCanExecute {  get; set; }
    }
}

3、NotifyBase.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace CourseManagement.Common
{
    public class NotifyBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public void DoNotify([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this,new PropertyChangedEventArgs(propertyName));
        }
    }
}

4、PasswordHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace CourseManagement.Common
{
    public class PasswordHelper
    {
        public static readonly DependencyProperty PasswordProperty=
            DependencyProperty.RegisterAttached("Password",typeof(string),typeof(PasswordHelper),
                new PropertyMetadata("",new PropertyChangedCallback(OnPropertyChanged)));

        public static string GetPassword(DependencyObject d)
        {
            return (string)d.GetValue(PasswordProperty);
        }

        public static void SetPassword(DependencyObject d, string value)
        {
            d.SetValue(PasswordProperty,value);
        }

        public static readonly DependencyProperty AttachProperty =
            DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(PasswordHelper),
                new PropertyMetadata(default(bool), new PropertyChangedCallback(OnAttached)));

        public static bool GetAttach(DependencyObject d)
        {
            return (bool)d.GetValue(AttachProperty);
        }

        public static void SetAttach(DependencyObject d, string value)
        {
            d.SetValue(AttachProperty, value);
        }

        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            PasswordBox passwordBox=d as PasswordBox;
            passwordBox.PasswordChanged -= Password_PasswordChanged;
            if (!_isUpdating)
            {
                passwordBox.Password = e.NewValue?.ToString();
            }
            passwordBox.PasswordChanged += Password_PasswordChanged;
        }

        private static void OnAttached(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            PasswordBox passwordBox = d as PasswordBox;
            passwordBox.PasswordChanged += Password_PasswordChanged;
        }

        private static bool _isUpdating = false;
        private static void Password_PasswordChanged(object sender, RoutedEventArgs e)
        {
            PasswordBox passwordBox = sender as PasswordBox;
            _isUpdating = true;
            SetPassword(passwordBox, passwordBox.Password);
            _isUpdating=false;
        }
    }
}

5、LoginModel.cs

using CourseManagement.Common;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CourseManagement.Model
{
    public class LoginModel:NotifyBase
    {
		private string _userName;
		public string UserName
		{
			get { return _userName; }
			set { _userName = value; this.DoNotify();}
		}

		private string _password;
		public string Password
		{
			get { return _password; }
			set { _password = value; this.DoNotify();}
		}

		private string _validationCode;
		public string ValidationCode
		{
			get { return _validationCode; }
			set { _validationCode = value; this.DoNotify();}
		}

	}
}

6、LoginView.xaml

<Window x:Class="CourseManagement.View.LoginView"
        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:CourseManagement.View"
        xmlns:common="clr-namespace:CourseManagement.Common"
        mc:Ignorable="d"
        Title="系统登录" Height="600" Width="360"
        FontFamily="Microsoft YaHei" FontWeight="ExtraLight"
        ResizeMode="NoResize" WindowStartupLocation="CenterScreen"
        WindowStyle="None" AllowsTransparency="True" Background="{x:Null}"
        Name="LoginWindow"
        >
    <Window.Resources>
        <ControlTemplate TargetType="Button" x:Key="CLoseButtonTemplate">
            <Border Background="Transparent" Name="Back">
                <Path Data="M0,0 12,12 M0,12 12,0" Stroke="White" StrokeThickness="1" VerticalAlignment="Center" HorizontalAlignment="Center"/>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter TargetName="Back" Property="Background" Value="#22FFFF"/>
                </Trigger>
                <Trigger Property="IsPressed" Value="true">
                    <Setter TargetName="Back" Property="Background" Value="#FF22FF"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

        <ControlTemplate TargetType="Button" x:Key="LoginButtonTemplate">
            <Border Background="#007DFA" CornerRadius="5">
                <Grid>
                    <Border CornerRadius="4" Background="#22ffffff" Name="Back" Visibility="Hidden"/>
                    <ContentControl Content="{TemplateBinding Content}" VerticalAlignment="Center" HorizontalAlignment="Center"
                                Foreground="{TemplateBinding Foreground}"/>
                </Grid>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter Property="Visibility" Value="Visible" TargetName="Back"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
        
        <SolidColorBrush x:Key="TextBox.Static.Border" Color="#FFABAdB3"/>
        <SolidColorBrush x:Key="TextBox.MouseOver.Border" Color="#FF7EB4EA"/>
        <SolidColorBrush x:Key="TextBox.Focus.Border" Color="#FF569DE5"/>
        <Style x:Key="UserNameTextBoxStyle" TargetType="{x:Type TextBox}">
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
            <Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="KeyboardNavigation.TabNavigation" Value="None"/>
            <Setter Property="HorizontalContentAlignment" Value="Left"/>
            <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
            <Setter Property="AllowDrop" Value="true"/>
            <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
            <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TextBox}">
                        <Border x:Name="border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="True"
                                CornerRadius="5">
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="40"/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <TextBlock Text="&#xe7ae;" FontFamily="../Assets/Fonts/#iconfont" FontSize="20"
                                           VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="#DDD"/>
                                <ScrollViewer x:Name="PART_ContentHost" Grid.Column="1" Focusable="false" HorizontalScrollBarVisibility="Hidden" 
                                              VerticalScrollBarVisibility="Hidden"
                                              VerticalAlignment="Center" MinHeight="20"/>
                            </Grid>
                            
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.MouseOver.Border}"/>
                            </Trigger>
                            <Trigger Property="IsKeyboardFocused" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.Focus.Border}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsInactiveSelectionHighlightEnabled" Value="true"/>
                        <Condition Property="IsSelectionActive" Value="false"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                </MultiTrigger>
            </Style.Triggers>
        </Style>
        <SolidColorBrush x:Key="TextBox.Static.Border1" Color="#FFABAdB3"/>
        <SolidColorBrush x:Key="TextBox.MouseOver.Border1" Color="#FF7EB4EA"/>
        <SolidColorBrush x:Key="TextBox.Focus.Border1" Color="#FF569DE5"/>
        <Style x:Key="PasswordBoxStyle" TargetType="{x:Type PasswordBox}">
            <Setter Property="PasswordChar" Value="●"/>
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
            <Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border1}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="KeyboardNavigation.TabNavigation" Value="None"/>
            <Setter Property="HorizontalContentAlignment" Value="Left"/>
            <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
            <Setter Property="AllowDrop" Value="true"/>
            <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
            <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type PasswordBox}">
                        <Border x:Name="border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="True"
                                CornerRadius="5">
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="40"/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <TextBlock Text="&#xe90c;" FontFamily="../Assets/Fonts/#iconfont" FontSize="20"
                                           VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="#DDD"/>
                                <ScrollViewer x:Name="PART_ContentHost" Grid.Column="1" Focusable="false" HorizontalScrollBarVisibility="Hidden" 
                                              VerticalScrollBarVisibility="Hidden"
                                              VerticalAlignment="Center" MinHeight="20"/>
                            </Grid>
                            
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.MouseOver.Border1}"/>
                            </Trigger>
                            <Trigger Property="IsKeyboardFocused" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.Focus.Border1}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsInactiveSelectionHighlightEnabled" Value="true"/>
                        <Condition Property="IsSelectionActive" Value="false"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                </MultiTrigger>
            </Style.Triggers>
        </Style>
        <SolidColorBrush x:Key="TextBox.Static.Border2" Color="#FFABAdB3"/>
        <SolidColorBrush x:Key="TextBox.MouseOver.Border2" Color="#FF7EB4EA"/>
        <SolidColorBrush x:Key="TextBox.Focus.Border2" Color="#FF569DE5"/>
        <Style x:Key="ValidationCodeTextBoxStyle" TargetType="{x:Type TextBox}">
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
            <Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border2}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="KeyboardNavigation.TabNavigation" Value="None"/>
            <Setter Property="HorizontalContentAlignment" Value="Left"/>
            <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
            <Setter Property="AllowDrop" Value="true"/>
            <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
            <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TextBox}">
                        <Border x:Name="border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="True"
                                CornerRadius="5">
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="40"/>
                                    <ColumnDefinition/>
                                    <ColumnDefinition Width="80"/>
                                </Grid.ColumnDefinitions>
                                <TextBlock Text="&#xe6ba;" FontFamily="../Assets/Fonts/#iconfont" FontSize="20"
                                           VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="#DDD"/>
                                <ScrollViewer x:Name="PART_ContentHost" Grid.Column="1" Focusable="false" HorizontalScrollBarVisibility="Hidden" 
                                              VerticalScrollBarVisibility="Hidden"
                                              VerticalAlignment="Center" MinHeight="20"/>
                                <Image Grid.Column="2" Source="../Assets/Validation/V0480.png" VerticalAlignment="Center" HorizontalAlignment="Center"
                                       Opacity="0.5"/>
                            </Grid>

                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.MouseOver.Border2}"/>
                            </Trigger>
                            <Trigger Property="IsKeyboardFocused" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.Focus.Border2}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsInactiveSelectionHighlightEnabled" Value="true"/>
                        <Condition Property="IsSelectionActive" Value="false"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                </MultiTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Border Margin="5" Background="White" CornerRadius="10">
        <Border.Effect>
            <DropShadowEffect Color="Gray" ShadowDepth="0" BlurRadius="5" Opacity="0.3" Direction="0"/>
        </Border.Effect>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="1.8*"/>
                <RowDefinition Height="3*"/>
                <RowDefinition Height="80"/>
            </Grid.RowDefinitions>
            <!--第1行Log-->
            <Border Background="#007DFA" CornerRadius="10 10 0 0" MouseLeftButtonDown="WinMove_MouseLeftButtonDown"/>
            <Button VerticalAlignment="Top" HorizontalAlignment="Right" Width="30" Height="30"
                    Template="{StaticResource CLoseButtonTemplate}"
                    Command="{Binding CloseWindowCommand}" CommandParameter="{Binding ElementName=LoginWindow}"/>
            <StackPanel VerticalAlignment="Bottom" Margin="0 0 0 20">
                <Border Width="100" Height="100" Background="White" HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="5">
                    <Border.Effect>
                        <DropShadowEffect Color="white" ShadowDepth="0" BlurRadius="5" Opacity="0.3" Direction="0"/>
                    </Border.Effect>
                    <Border Width="80" Height="80">
                        <Border.Background>
                            <ImageBrush ImageSource="../Assets/Images/Logo.png"/>
                        </Border.Background>
                    </Border>
                </Border>
                <TextBlock Text="大浪淘沙" HorizontalAlignment="Center" FontSize="20" Foreground="White"/>
            </StackPanel>
            <!--第2行登录-->
            <Grid Grid.Row="1" Margin="20 20">
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition/>
                    <RowDefinition/>
                    <RowDefinition/>
                    <RowDefinition MinHeight="23" Height="auto"/>
                </Grid.RowDefinitions>
                <TextBox Text="{Binding LoginModel.UserName}" Style="{DynamicResource UserNameTextBoxStyle}" FontSize="16" Foreground="#555" Height="40"/>
                <PasswordBox Style="{DynamicResource PasswordBoxStyle}" Grid.Row="1" FontSize="16" Foreground="#555" Height="40" 
                             common:PasswordHelper.Attach="True" common:PasswordHelper.Password="{Binding LoginModel.Password,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
                <TextBox Text="{Binding LoginModel.ValidationCode}" Style="{DynamicResource ValidationCodeTextBoxStyle}" Grid.Row="2" Height="40"/>
                <Button Template="{StaticResource LoginButtonTemplate}" Content="登录" Grid.Row="3" Height="40" Foreground="White"
                        FontSize="16" Command="{Binding LoginCommand}" CommandParameter="{Binding ElementName=LoginWindow}"/>
                <TextBlock Text="{Binding ErrorMessage}" Grid.Row="4" Foreground="Red" FontSize="16" TextWrapping="Wrap" LineHeight="22"/>
            </Grid>
            <!--第3行其它方式-->
            <Grid Grid.Row="2" Margin="20 0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="20"/>
                    <RowDefinition/>
                </Grid.RowDefinitions>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition Width="30"/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Border BorderBrush="#DDD" BorderThickness="0 0 0 1" VerticalAlignment="Center"/>
                    <TextBlock Text="OR" Grid.Column="1" Foreground="#DDD" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    <Border Grid.Column="2" BorderBrush="#DDD" BorderThickness="0 0 0 1" VerticalAlignment="Center"/>
                </Grid>
                <UniformGrid Columns="3" Grid.Row="1">
                    <UniformGrid.Resources>
                        <Style TargetType="TextBlock">
                            <Setter Property="HorizontalAlignment" Value="Center"/>
                            <Setter Property="VerticalAlignment" Value="Center"/>
                            <Setter Property="Foreground" Value="#DDD"/>
                            <Setter Property="FontFamily" Value="../Assets/Fonts/#iconfont"/>
                            <Setter Property="FontSize" Value="40"/>
                            <Style.Triggers>
                                <Trigger Property="IsMouseOver" Value="True">
                                    <Setter Property="Foreground" Value="#007DFA"/>
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </UniformGrid.Resources>
                    <TextBlock Text="&#xe887;"/>
                    <TextBlock Text="&#xe619;"/>
                    <TextBlock Text="&#xe625;"/>
                </UniformGrid>
            </Grid>
        </Grid>
    </Border>
</Window>

7、LoginView.xaml.cs

using CourseManagement.Model;
using CourseManagement.ViewModel;
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 CourseManagement.View
{
    /// <summary>
    /// LoginView.xaml 的交互逻辑
    /// </summary>
    public partial class LoginView : Window
    {

        public LoginView()
        {
            InitializeComponent();
            this.DataContext = new LoginViewModel();
        }

        private void WinMove_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if(e.LeftButton == MouseButtonState.Pressed)
            {
                this.DragMove();
            }
        }
    }
}

8、MainView.xaml

<Window x:Class="CourseManagement.View.MainView"
        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:CourseManagement"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        
    </Grid>
</Window>

9、MainView.xaml.cs

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

10、LoginViewModel.cs

using CourseManagement.Common;
using CourseManagement.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace CourseManagement.ViewModel
{
    public class LoginViewModel:NotifyBase
    {
        public LoginModel LoginModel { get; set; }=new LoginModel();
        public CommandBase CloseWindowCommand { get; set; }
        public CommandBase LoginCommand { get; set; }

        private string _errorMessage;

        public string ErrorMessage
        {
            get { return _errorMessage; }
            set { _errorMessage = value; this.DoNotify(); }
        }


        public LoginViewModel() 
        {
            //this.LoginModel = new LoginModel();
            //this.LoginModel.UserName = "Tiger";
            //this.LoginModel.Password = "123456";

            this.CloseWindowCommand = new CommandBase();
            this.CloseWindowCommand.DoExecute = new Action<object>((o) =>
            {
                (o as Window).Close();
            });
            this.CloseWindowCommand.DoCanExecute=new Func<object, bool>((o) => { return true; });

            this.LoginCommand=new CommandBase();
            this.LoginCommand.DoExecute = new Action<object>(DoLogin);
            this.LoginCommand.DoCanExecute = new Func<object, bool>((o) => { return true; });

        }

        private void DoLogin(object o)
        {
            this.ErrorMessage = "";
            if (string.IsNullOrEmpty(LoginModel.UserName))
            {
                this.ErrorMessage = "请输入用户名！";
                return;
            }
            if (string.IsNullOrEmpty(LoginModel.Password))
            {
                this.ErrorMessage = "请输入密码！";
                return;
            }
            if (string.IsNullOrEmpty(LoginModel.ValidationCode))
            {
                this.ErrorMessage = "请输入验证码！";
                return;
            }
            if (LoginModel.ValidationCode.ToLower() != "0480")
            {
                this.ErrorMessage = "验证码输入不正确！";
                return;
            }
            Application.Current.Dispatcher.Invoke(new Action(() =>
            {
                (o as Window).DialogResult = true;
            }));
            
        }

    }
}

11、App.xaml

<Application x:Class="CourseManagement.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:CourseManagement"
             ShutdownMode="OnExplicitShutdown">
    <Application.Resources>
         
    </Application.Resources>
</Application>

12、App.xaml.cs

using CourseManagement.View;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace CourseManagement
{
    /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            if(new LoginView().ShowDialog() == true)
            {
                new MainView().ShowDialog();
            }
            Application.Current.Shutdown();
        }
    }
}

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