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Demo演示：

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1. 新建项目

站长开发环境：

• VS 2019企业版 16.70

• .NET 5 Preview 5

.NET 5 WPF 项目模板和 .NET Core 3.1 WPF 项目模板没有区别，创建好项目后，NuGet 引入 MaterialDesignThemes 库：

2.引入样式

演示Demo就一个xaml文件和xaml.cs文件，为了方便后面收集WPF界面设计效果，统一放在了开源项目TerminalMACS.ManagerForWPF[1]中，所以控件样式引用直接在FoodAppLoginView.xaml中添加：

<Window.Resources><ResourceDictionary><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" /><ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" /><ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Amber.xaml" /><ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" /></ResourceDictionary.MergedDictionaries></ResourceDictionary>
</Window.Resources>

3.控件动画效果

见上面GIF动画，登录窗口加载时，用户名输入框、密码输入框、记住密码、右侧背景图片等元素有动画效果，每个部分代码结构类似，比如下面的用户名输入框代码：

<!--#region User name textblox-->
<materialDesign:TransitioningContent Grid.Row="2" Margin="90,20,00,0" HorizontalAlignment="Left"><materialDesign:TransitioningContent.OpeningEffects><materialDesign:TransitionEffect Kind="SlideInFromLeft" Duration="0:0:2"/></materialDesign:TransitioningContent.OpeningEffects><StackPanel Style="{StaticResource setVisibilityBasedLogin}" Orientation="Horizontal"><materialDesign:PackIcon Kind="Account" Width="16" Height="16" VerticalAlignment="Center"Margin="0,5,10,0" Foreground="{Binding ElementName=NameTextBox, Path=BorderBrush}"/><TextBox x:Name="NameTextBox" Width="140" materialDesign:HintAssist.Hint="{markup:I18n {x:Static i18NResources:Language.FoodAppLoginView_UserName}}"Style="{StaticResource MaterialDesignFloatingHintTextBox}"/></StackPanel>
</materialDesign:TransitioningContent>
<!--#endregion-->

使用了开源控件MD的TransitioningContent组件，其中TransitionEffect的Kind属性设置控件动画方向。

4. 模拟登录

登录按钮布局代码：

<!--#region control panel-->
<materialDesign:TransitioningContent Grid.Row="4" Margin="40,20,0,0"><materialDesign:TransitioningContent.OpeningEffects><materialDesign:TransitionEffect Kind="SlideInFromBottom" Duration="0:0:2"/></materialDesign:TransitioningContent.OpeningEffects><StackPanel Style="{StaticResource setVisibilityBasedLogin}" Orientation="Horizontal" HorizontalAlignment="Center"><CheckBox Content="{markup:I18n {x:Static i18NResources:Language.FoodAppLoginView_RememberMe}}"/><Button Style="{StaticResource MaterialDesignRaisedButton}"Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}"materialDesign:ButtonAssist.CornerRadius="20"Width="80" Height="40" Margin="120,0,0,0"Content="{markup:I18n {x:Static i18NResources:Language.FoodAppLoginView_Login}}"/></StackPanel>
</materialDesign:TransitioningContent>
<!--#endregion-->

点击登录时，打开等待对话框（点击时绑定了materialDesign:DialogHost.OpenDialogCommand），在等待对话框的打开与关闭事件中做登录逻辑处理。

private async Task<bool> ValidateCreds()
{// 模拟登录// 你可以发送登录信息到服务器，得到认证回馈await Task.Delay(TimeSpan.FromSeconds(2));Random gen = new Random(DateTime.Now.Millisecond);int loginProb = gen.Next(100);return loginProb <= 20;
}private async void OpenCB_DialogOpened(object sender, MaterialDesignThemes.Wpf.DialogOpenedEventArgs eventArgs)
{try{this.IsJustStarted = true;this.LoginStatusmsg = "";bool isLoggedIn = await ValidateCreds();if (isLoggedIn){// 需要关闭登录对话框并显示主窗口eventArgs.Session.Close(true);}else{// 登录失败，设置false作为参数eventArgs.Session.Close(false);}}catch (Exception){//throw;}
}private void ClosingCB_DialogClosing(object sender, MaterialDesignThemes.Wpf.DialogClosingEventArgs eventArgs)
{if (eventArgs.Parameter == null){return;}IsLoggedIn = (bool)eventArgs.Parameter;IsJustStarted = false;if(IsLoggedIn){this.LoginStatusmsg = I18nManager.Instance.Get(I18nResources.Language.FoodAppLoginView_Success).ToString();}else{this.LoginStatusmsg = I18nManager.Instance.Get(I18nResources.Language.FoodAppLoginView_Fail).ToString();}
}

等待对话框打开事件中，模拟登录逻辑。

等待对话框关闭事件中，做界面响应信息。

5. 源码下载

上面只贴了部分关键代码，源码已放Github中。

参考视频：WPF Food App Login UI Material Design [Speed Design][2]

Demo源码：FoodAppLoginUI[3]

[1]

TerminalMACS.ManagerForWPF: https://github.com/dotnet9/TerminalMACS.ManagerForWPF

[2]

WPF Food App Login UI Material Design [Speed Design]: https://www.youtube.com/watch?v=1i5oWNvIYmo

[3]

FoodAppLoginUI: https://github.com/dotnet9/TerminalMACS.ManagerForWPF/tree/master/src/TerminalMACS.TestDemo/Views/FoodAppLoginUI

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