C# CM框架下打造符合MVVM思想的WPF登录窗体

​概述

• 登录窗体无论在bs还是cs中都很常见，使用winform或者wpf ui进行设计都相对比较简单，但是如果在WPF框架，比如：Caliburn.Micro下，设计一个符合MVVM思想的登录窗体就相对有了点难度，因为CM框架本身的设计理念是VM first而非View first.接下来开始讲解我的设计.

后台设计

• 数据模型：定义一个用户登录类，类中囊括三个属性

• public class UserInformation
      {
          public UserInformation()
          {
              UserName = "zls20210502";
              Password = "123456";
          }
          /// <summary>
          /// 用户名
          /// </summary>
          public string UserName { get; set; }
  ​
          /// <summary>
          /// 密码
          /// </summary>
          public string Password { get; set; }
  ​
          /// <summary>
          /// 性别
          /// </summary>
          public int Gender { get; set; }
  ​
  ​
      }
  

  　　登录信息验证：这里按理应该增加注册信息，应该是个list，我只是举例写了一组：

• public string ValidateLoginData()
          {
              StringBuilder sb = new StringBuilder();
              if (UserInformation.UserName == "zls20210502"
                      && UserInformation.Password == "12345678")
              {
                  sb.Append("");
              }
              else
              {
                  sb.AppendLine("账号或者密码输入有误,请检查！");
              }
              return sb.ToString();
          }
  

  　　登录方法：这里首先验证登录信息，验证失败就弹窗提示报错信息，否则通过GetView()方法获取当前view并隐藏，然后通过IOC获取IWindowManager，再通过ShowDialog显示主窗体，这几个方法都CM框架集成的方法.登录窗体需要继承Screen.

•  public void BtnLogin()
          {
              var str = ValidateLoginData();
              if(!string.IsNullOrEmpty(str))
              {
                  MessageBox.Show(str);
   
              }
              else 
              {
                  var loginWindow = (Window)this.GetView();
                  loginWindow.Hide();
  ​
                  MainWindowViewModel mainWindowViewModel = new MainWindowViewModel();
                  IWindowManager windowManager = IoC.Get<IWindowManager>();
                  windowManager.ShowDialog(mainWindowViewModel);
                  this.TryClose();
              }
  ​
          }
  

  　　

  前台设计

  • 前台的密码框采用dev下的PasswordBoxEdit，因为wpf自带的PasswordBox的Password不支持绑定：

  全部代码如下：

• <Window x:Class="Caliburn.Micro.Hello.LoginView"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          mc:Ignorable="d"
          WindowStyle="None" AllowsTransparency="True" Background="{x:Null}"
          Title="LoginWindow" Height="320" Width="300" WindowStartupLocation="CenterScreen">
      <Grid  Width="{Binding Width, ElementName=w}" Height="{Binding Height, ElementName=w}">
          <Grid.RowDefinitions>
              <RowDefinition Height="150" />
              <RowDefinition Height="50" />
              <RowDefinition Height="50" />
              <RowDefinition  />
          </Grid.RowDefinitions>
          <Border Grid.RowSpan="4" BorderBrush="Gray" BorderThickness="3" CornerRadius="20" Margin="10"  Opacity="1"  Background="White"></Border>
          <Button  Name="BtnClose"  Grid.Row="0" Margin="20" 
                   Width="48" Height="48"  BorderBrush="{x:Null}" Background="{x:Null}"
                   HorizontalAlignment="Right" VerticalAlignment="Top">
              <Image Source="/Images/exit1.png"/>
          </Button>
          <Image Grid.Row="0"  VerticalAlignment="Center" Width="120"  Height="120" Source="/Images/login.png" />
  ​
          <TextBox x:Name="UserTextBox" Text="{Binding UserInformation.UserName}"  Grid.Row="1"  Width="200" VerticalAlignment="Bottom" BorderThickness="0,0,0,1" Height="25"></TextBox>
          <TextBlock Foreground="DarkGray"  Grid.Row="1"  IsHitTestVisible="False" HorizontalAlignment="Center" Height="25" Text="请输入用户名" VerticalAlignment="Bottom" Width="90" FontFamily="Microsoft YaHei">
              <TextBlock.Style>
                  <Style TargetType="{x:Type TextBlock}">
                      <Setter Property="Visibility" Value="Collapsed"/>
                      <Style.Triggers>
                          <DataTrigger Binding="{Binding Text, ElementName=UserTextBox}" Value="">
                              <Setter Property="Visibility" Value="Visible"/>
                          </DataTrigger>
                      </Style.Triggers>
  </Style>
              </TextBlock.Style>
          </TextBlock>
          <dxe:PasswordBoxEdit  x:Name="PwdTextBox" Text="{Binding UserInformation.Password}"  
                                Grid.Row="2"  Width="200" 
                                VerticalAlignment="Bottom" BorderThickness="0,0,0,1" Height="25"></dxe:PasswordBoxEdit>
          <TextBlock Foreground="DarkGray" Grid.Row="2"  IsHitTestVisible="False" HorizontalAlignment="Center" Height="25" Text="请输入密码" VerticalAlignment="Bottom" Width="90" FontFamily="Microsoft YaHei">
              <TextBlock.Style>
                  <Style TargetType="{x:Type TextBlock}">
                      <Setter Property="Visibility" Value="Collapsed"/>
                      <Style.Triggers>
                          <DataTrigger Binding="{Binding Text, ElementName=PwdTextBox}" Value="">
                              <Setter Property="Visibility" Value="Visible"/>
                          </DataTrigger>
                      </Style.Triggers>
  </Style>
              </TextBlock.Style>
          </TextBlock>
  ​
          <Button Name="BtnLogin"  Grid.Row="2"  Width="48" Margin="0,0,20,0"
                  BorderBrush="{x:Null}" Background="{x:Null}" 
                  Height="48"   HorizontalAlignment="Right" VerticalAlignment="Top">
              <Image Source="/Images/userlogin.png"/>
          </Button>
      </Grid>
  </Window>
  

  　　

  效果演示

• 

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