C# 登录界面代码

背景

MVVM 是一种软件架构模式，用于创建用户界面。它将用户界面（View）、业务逻辑（ViewModel）和数据模型（Model）分离开来，以提高代码的可维护性和可测试性。

MainWindow 类是 View（视图），负责用户界面的呈现和交互，它是用户直接看到和操作的部分。

LoginVM 类是 ViewModel（视图模型），它充当了 View 和 Model 之间的中介，处理了视图与数据模型之间的交互逻辑，以及用户操作的响应逻辑。

LoginModel 类是 Model（模型），它包含了应用程序的数据和业务逻辑，用于存储和处理用户的身份验证信息。

展示

代码

LoginModel.cs

cpp 复制代码

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

namespace WpfApp2
{
    public class LoginModel
    {
        private string _UserName;

        public string UserName
        {
            get { return _UserName; }
            set
            {
                _UserName = value;
            }
        }

        private string _Password;

        public string Password
        {
            get { return _Password; }
            set
            {
                _Password = value;
            }
        }
    }
}

LoginVM.cs

cpp 复制代码

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

namespace WpfApp2
{
    public class LoginVM : INotifyPropertyChanged
    {
        private MainWindow _main;
        public LoginVM(MainWindow main)
        {
            _main = main;
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void RaisePropetyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        private LoginModel _LoginM = new LoginModel();

        public string UserName
        {
            get { return _LoginM.UserName; }
            set
            {
                _LoginM.UserName = value;
                RaisePropetyChanged("UserName");
            }
        }
        public string Password
        {
            get { return _LoginM.Password; }
            set
            {
                _LoginM.Password = value;
                RaisePropetyChanged("Password");
            }
        }
        /// <summary>
        /// 登录方法
        /// </summary>
        void Loginfunc()
        {
            if (UserName == "wpf" && Password == "666")
            {
                MessageBox.Show("OK");
                Index index = new Index();
                index.Show();
                //想办法拿到mainwindow
                _main.Hide();
            }
            else
            {
                MessageBox.Show("输入的用户名或密码不正确");
                UserName = "";
                Password = "";
            }
        }
        bool CanLoginExecute()
        {
            return true;
        }
        public ICommand LoginAction
        {
            get
            {
                return new RelayCommand(Loginfunc,CanLoginExecute);
            }
        }
    }
}

MainWindow.xaml

cpp 复制代码

<Window x:Class="WpfApp2.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:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition Height="1*"></RowDefinition>
            <RowDefinition Height="9*"></RowDefinition>
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0" Grid.Column="0" Text="上海市-市图书馆" FontSize="18" HorizontalAlignment="Center"></TextBlock>
        <StackPanel Grid.Row="1" Grid.Column="0" Background="#0078d4">
            <TextBlock Text="登录" FontSize="22" HorizontalAlignment="Center" Foreground="Wheat" Margin="5">
            </TextBlock>    
        </StackPanel>
        <Grid Grid.Row="3" ShowGridLines="False" HorizontalAlignment="Center">
            <Grid.RowDefinitions>
                <RowDefinition Height="30"></RowDefinition>
                <RowDefinition Height="30"></RowDefinition>
                <RowDefinition Height="30"></RowDefinition>
                <RowDefinition Height="30"></RowDefinition>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions >
                <ColumnDefinition Width="auto"></ColumnDefinition>
                <ColumnDefinition Width="200"></ColumnDefinition>
            </Grid.ColumnDefinitions>

            <TextBlock Text="用户名" Grid.Row="0" Grid.Column="0" VerticalAlignment="Center"></TextBlock>
            <TextBox Text="{Binding UserName}"  Grid.Row="0" Grid.Column="1" Margin="2" ></TextBox>
            <TextBlock Text="密码" Grid.Row="1" Grid.Column="0" VerticalAlignment="Center"></TextBlock>
            <TextBox Text="{Binding Password}"  Grid.Row="1" Grid.Column="1" Margin="2"></TextBox>

            <CheckBox Grid.ColumnSpan="2" Content="记住密码" Grid.Row="2"></CheckBox>
            <local:CustomButton ButtonCornerRadius="5" BackgroundHover="Red" BackgroundPressed="Green"  Foreground="#FFFFFF"  Background="#3C7FF8" Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2" Command="{Binding LoginAction}" Height="30" VerticalAlignment="Top">登录</local:CustomButton>
        </Grid>
    </Grid>
</Window>

MainWindow.xaml.cs

cpp 复制代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
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 WpfApp2
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        LoginVM loginVM;
        public MainWindow()
        {
            InitializeComponent();
            loginVM = new LoginVM(this);
            this.DataContext = loginVM;
        }
    }
}

RelayCommand.cs

cpp 复制代码

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

namespace WpfApp2
{
    public class RelayCommand : ICommand
    {
        /// <summary>
        /// 命令是否能够执行
        /// </summary>
        readonly Func<bool> _canExecute;
        /// <summary>
        /// 命令需要执行的方法
        /// </summary>
        readonly Action _exexute;

        public RelayCommand(Action exexute,Func<bool> canExecute)
        {
            _canExecute = canExecute;
            _exexute = exexute;
        }
        public bool CanExecute(object parameter)
        {
            if (_canExecute == null)
            {
                return true;
            }
            return _canExecute();
        }

        public void Execute(object parameter)
        {
            _exexute();
        }

        public event EventHandler CanExecuteChanged
        {
            add {
                if (_canExecute != null)
                {
                    CommandManager.RequerySuggested += value;
                }
            }
            remove
            {
                if (_canExecute != null)
                {
                    CommandManager.RequerySuggested -= value;
                }
            }
        }
    }
}

自定义按钮CustomButton

App.xaml.cs

cpp 复制代码

<Application x:Class="WpfApp2.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp2"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="CustomButtonStyles.xaml"></ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

CustomButton.cs

cpp 复制代码

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.Media;

namespace WpfApp2
{
    public class CustomButton:Button
    {
        //依赖属性


        public CornerRadius ButtonCornerRadius
        {
            get { return (CornerRadius)GetValue(ButtonCornerRadiusProperty); }
            set { SetValue(ButtonCornerRadiusProperty, value); }
        }

        // Using a DependencyProperty as the backing store for ButtonCornerRadius.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ButtonCornerRadiusProperty =
            DependencyProperty.Register("ButtonCornerRadius", typeof(CornerRadius), typeof(CustomButton));

        public Brush BackgroundHover
        {
            get { return (Brush)GetValue(BackgroundHoverProperty); }
            set { SetValue(BackgroundHoverProperty, value); }
        }

        // Using a DependencyProperty as the backing store for BackgroundHover.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty BackgroundHoverProperty =
            DependencyProperty.Register("BackgroundHover", typeof(Brush), typeof(CustomButton));

        public Brush BackgroundPressed
        {
            get { return (Brush)GetValue(BackgroundPressedProperty); }
            set { SetValue(BackgroundPressedProperty, value); }
        }

        // Using a DependencyProperty as the backing store for BackgroundPressed.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty BackgroundPressedProperty =
            DependencyProperty.Register("BackgroundPressed", typeof(Brush), typeof(CustomButton));
    }
}

数据字典

CustombuttonStyles.xaml

cpp 复制代码

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:bb="clr-namespace:WpfApp2">
    <Style TargetType="{x:Type bb:CustomButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type bb:CustomButton}">
                    <Border x:Name="buttonBorder" Background="{TemplateBinding Background}" CornerRadius="{TemplateBinding ButtonCornerRadius}">
                        <TextBlock Text="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                   VerticalAlignment="{TemplateBinding VerticalContentAlignment}"></TextBlock>
                    </Border>
                    <!--触发器-->
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="buttonBorder" Property="Background" Value="{Binding BackgroundHover,RelativeSource={RelativeSource TemplatedParent}}"></Setter>
                        </Trigger>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="buttonBorder" Property="Background" Value="{Binding BackgroundPressed,RelativeSource={RelativeSource TemplatedParent}}"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>