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当主窗体加载时间过长，这时候基本都会想添加一个等待操作来响应用户点击，提高用户体验。下面我记录两个方法，一点拙见，仅供参考。

方法1:在App类中使用SplashScreen类。

protected override void OnStartup(StartupEventArgs e)
{// 显示启动画面ShowSplashScreen();base.OnStartup(e);
}private void ShowSplashScreen()
{// 这里要注意的点就是aa.jpg 属性的生成的操作要设置为资源(Resource).SplashScreen splash = new SplashScreen(/Images/aa.jpg);/** 第一个参数表示是否自动关闭* 第二个参数表示启动画面窗口是否会被置于顶层,即使有其他程序的窗口处于活动状态,* 启动画面也会显示在它们之上.* 如果设置为false,表示遵循正常的窗口焦点规则,如果用户切换到其他程序,* 启动画面可能会被其他窗口遮挡.* 如果设置为true,保证用户一直能够看到它.*/splash.Show(true, true);// 这里执行一些数据初始化的代码//Task.Run(() =>//{//    // 模拟耗时操作//    Thread.Sleep(1000);//    // 在UI线程上关闭启动画面//    Dispatcher.Invoke(() =>//    {//        // 这里会有一个淡淡渐渐消失的效果//        splash.Close(TimeSpan.FromSeconds(2));//    });//});
}

也可以直接设置图片的属性-生成的操作一栏为SplashScreen。这样就不用写上面的代码。

方法1缺点:仅能展示图片，gif图片也仅展示第一帧，如有办法展示完整gif请给个传送门。

方法2：自定义窗体作为欢迎屏幕

参考窗体代码(后台无操作，故仅贴前台代码，带加载动画的哦):我命名为:Splash

<Window x:Class="SmartHome.Splash"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" mc:Ignorable="d"Title="Splash" Width="640" Height="480" Background="#FF1D2128"  ResizeMode="NoResize"ShowInTaskbar="False"SnapsToDevicePixels="True"TextOptions.TextFormattingMode="Display"UseLayoutRounding="True"WindowStartupLocation="CenterScreen"WindowStyle="None" Foreground="{x:Null}"><Grid><Rectangle HorizontalAlignment="Left" Height="60" Margin="173,117,0,0" Stroke="Black" VerticalAlignment="Top" Width="60" Fill="#FF2573DC" RadiusX="10" RadiusY="10"/><Rectangle Fill="#FF1D2128" HorizontalAlignment="Left" Height="43" Margin="185.332,125.671,0,0" RadiusY="5" RadiusX="5" Stroke="#FF1D2128" VerticalAlignment="Top" Width="10"/><Rectangle Fill="#FF1D2128" HorizontalAlignment="Left" Height="27.046" Margin="210.749,141.625,0,0" RadiusY="5" RadiusX="5" Stroke="#FF1D2128" VerticalAlignment="Top" Width="10"/><Rectangle Fill="#FF1D2128" HorizontalAlignment="Left" Height="10" Margin="189.25,141.625,0,0" RadiusY="5" RadiusX="5" Stroke="#FF1D2128" VerticalAlignment="Top" Width="31.499"/><Ellipse Fill="#FF1D2128" HorizontalAlignment="Left" Height="11" Margin="209.749,125.671,0,0" Stroke="#FF1D2128" VerticalAlignment="Top" Width="11"/><Path Data="M244,102 L244,187.2115" Fill="#FF2573DC" HorizontalAlignment="Left" Height="60" Margin="250,117,0,0" Stretch="Fill" Stroke="#FF2573DC" VerticalAlignment="Top" Width="3" StrokeThickness="3"/><Label Content="HAHAHAHA" Height="60" Margin="259,115,169,0" VerticalAlignment="Top" Foreground="#FF2573DC" FontSize="48" FontFamily="French Script MT" FontWeight="Bold"/><Path Data="M1.5000012,1.5 L14.500009,14.500008 M14.500005,12.39 L1.5,25.390005" Fill="#FF2573DC" HorizontalAlignment="Left" Margin="205.167,230.25,0,222.86" Stretch="Fill" Stroke="#FF2573DC" StrokeThickness="3" Width="16"/><Label Content="程序名称" Margin="230.749,221,204,222.86" FontSize="24" Foreground="White"/><Label Content="即将进入" Margin="278.749,0,277,182.86" FontSize="16" Foreground="White" Height="36.14" HorizontalAlignment="Center" VerticalAlignment="Bottom"/><Grid Background="#FF1D2128"  HorizontalAlignment="Left" Margin="249,301,0,99"><Grid.Resources><Style x:Key="rec" TargetType="Rectangle"><Setter Property="Width" Value="10"/><Setter Property="Height" Value="30"/><Setter Property="Fill" Value="#FF2573DC"/></Style><PowerEase x:Key="powerEase" Power="3" EasingMode="EaseInOut"/></Grid.Resources><Grid.Triggers><EventTrigger RoutedEvent="Loaded"><BeginStoryboard><Storyboard RepeatBehavior="Forever" Storyboard.TargetProperty="Height"><DoubleAnimation Storyboard.TargetName="rec1" To="50" BeginTime="0:0:0.0" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec2" To="50" BeginTime="0:0:0.1" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec3" To="50" BeginTime="0:0:0.2" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec4" To="50" BeginTime="0:0:0.3" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec5" To="50" BeginTime="0:0:0.4" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec6" To="50" BeginTime="0:0:0.5" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec7" To="50" BeginTime="0:0:0.6" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec8" To="50" BeginTime="0:0:0.7" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec9" To="50" BeginTime="0:0:0.8" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/><DoubleAnimation Storyboard.TargetName="rec10" To="50" BeginTime="0:0:0.9" Duration="0:0:0.5" EasingFunction="{StaticResource powerEase}" AutoReverse="True"/></Storyboard></BeginStoryboard></EventTrigger></Grid.Triggers><Grid.ColumnDefinitions><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/><ColumnDefinition Width="15"/></Grid.ColumnDefinitions><Grid.RowDefinitions><RowDefinition/><RowDefinition/></Grid.RowDefinitions><Label Content="Loading..."Grid.Row="1"FontSize="18"FontFamily="Times New Roman"FontWeight="Bold"Grid.ColumnSpan="10"VerticalContentAlignment="Center"HorizontalContentAlignment="Center"/><Rectangle Name="rec1" Grid.Column="0" Style="{StaticResource rec}"/><Rectangle Name="rec2" Grid.Column="1" Style="{StaticResource rec}"/><Rectangle Name="rec3" Grid.Column="2" Style="{StaticResource rec}"/><Rectangle Name="rec4" Grid.Column="3" Style="{StaticResource rec}"/><Rectangle Name="rec5" Grid.Column="4" Style="{StaticResource rec}"/><Rectangle Name="rec6" Grid.Column="5" Style="{StaticResource rec}"/><Rectangle Name="rec7" Grid.Column="6" Style="{StaticResource rec}"/><Rectangle Name="rec8" Grid.Column="7" Style="{StaticResource rec}"/><Rectangle Name="rec9" Grid.Column="8" Style="{StaticResource rec}"/><Rectangle Name="rec10" Grid.Column="9" Style="{StaticResource rec}"/></Grid></Grid>
</Window>

使用方式:

在APP类下设置新的单线程打开窗体并赋值给全局变量方便关闭:

//定义一个静态的全局欢迎窗口
public static Splash Splash = new Splash();
protected override void OnStartup(StartupEventArgs e)
{base.OnStartup(e);Thread t = new Thread(() =>{Splash splash = new Splash();//把实例赋值给全局变量Splash= splash;//用Show的话动画效果不流畅splash.ShowDialog();});t.Name = "HelloWindow";//设置为单线程。一定要设置t.SetApartmentState(ApartmentState.STA);t.Start();
}

主窗体启动成功后的关闭方法:

public MainWindow()
{InitializeComponent();
//耗时的操作，比如实例化控件，页面，初始化数据等
//...
//窗口内容呈现完成后的方法，用load方法也可以看自己
this.ContentRendered += MainWindow_ContentRendered;
}private void MainWindow_ContentRendered(object sender, EventArgs e)
{if (App.Splash != null){//在该线程上关闭App.Splash.Dispatcher.Invoke((Action)(() => App.Splash.Close()));}
}

一点拙见，还请指正。各位大佬有更好的方法还请留个传送门，或评论区展现一下风采!!!!

好记性不如烂笔头................................................................................................