C# WPF遮罩對話框（Popup Message Overlay/ Dialog Host）

閱讀導航：app

1、先看效果
2、本文背景
3、代碼實現
4、文章參考
5、代碼下載

1、先看效果

2、本文背景

YouTube Design com WPF 大神處習得，經常使用的遮罩對話框實現，使用的開源 C# WPF控件庫 MaterialDesignInXAML ，本站曾有介紹：開源C# WPF控件庫《MaterialDesignInXAML》。ide

3、代碼實現

3.1 添加Nuget庫

站長使用.Net Core 3.1建立的WPF工程，建立「ScreenOverlayMessage」解決方案後，須要添加兩個Nuget庫：MaterialDesignThemes和MaterialDesignColors，上圖的效果是使用該控件庫實現的，很是強大。佈局

3.2 工程結構

不須要截圖，只修改了兩個文件，App.xaml添加MD控件4個樣式文件，MainWindow主窗口實現效果。學習

3.3 App.xaml引入MD控件樣式

<Application x:Class="DropDownMenu.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:DropDownMenu"
             StartupUri="MainWindow.xaml">
    <Application.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.Blue.xaml"/>
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Indigo.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

3.4 主窗體

MainWindow.xaml，總體佈局，看上圖加上下面的界面代碼，添加界面左上角logo圖標、左側導航菜單等，下面便是所有代碼。ui

<Window x:Class="ScreenOverlayMessage.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:ScreenOverlayMessage"
        mc:Ignorable="d"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes" MouseDown="Window_MouseDown"
        Title="MainWindow" Height="576" Width="1024" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" WindowStyle="None" Background="#FF423A3A">
    <Grid>
        <materialDesign:DialogHost BorderBrush="{DynamicResource MaterialDesignDivider}">
            <materialDesign:DialogHost.DialogContent>
                <Grid Width="300" Height="150" HorizontalAlignment="Center">
                    <StackPanel Orientation="Horizontal" Margin="15">
                        <materialDesign:PackIcon Kind="Folder" Foreground="{StaticResource PrimaryHueMidBrush}" Width="50" Height="50"/>
                        <TextBlock Foreground="Gray" Width="200" Margin="15 5" TextWrapping="Wrap">
                            容許應用程序訪問您計算機上的照片、媒體和文件？
                        </TextBlock>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="15">
                        <Button Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}" Style="{DynamicResource MaterialDesignFlatButton}" Margin="4" VerticalAlignment="Center">
                            拒絕
                        </Button>
                        <Button Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}" Style="{DynamicResource MaterialDesignFlatButton}" Margin="4" VerticalAlignment="Center">
                            容許
                        </Button>
                    </StackPanel>
                </Grid>
            </materialDesign:DialogHost.DialogContent>
            <Grid>
                <StackPanel Width="200" HorizontalAlignment="Left" Background="#FF472076">
                    <Grid Height="150" Background="White">
                        <Image Source="https://img.dotnet9.com/logo.png"/>
                    </Grid>
                    <Button Style="{StaticResource MaterialDesignFlatButton}" Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}">
                        <StackPanel Orientation="Horizontal" Height="30">
                            <materialDesign:PackIcon Kind="PhotoAlbum" Width="20" Height="20" VerticalAlignment="Center"/>
                            <TextBlock Text="照片" Margin="20 0" FontSize="15" VerticalAlignment="Center"/>
                        </StackPanel>
                    </Button>
                    <Button Style="{StaticResource MaterialDesignFlatButton}" Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}">
                        <StackPanel Orientation="Horizontal" Height="30">
                            <materialDesign:PackIcon Kind="Music" Width="20" Height="20" VerticalAlignment="Center"/>
                            <TextBlock Text="音樂" Margin="20 0" FontSize="15" VerticalAlignment="Center"/>
                        </StackPanel>
                    </Button>
                </StackPanel>
            </Grid>
        </materialDesign:DialogHost>
    </Grid>
</Window>

重點講解：spa

materialDesign:DialogHost：設置遮罩對話框覆蓋的地方，即彈出遮罩對話框後，背後有陰影的位置。
materialDesign:DialogHost.DialogContent：對話框內容，即彈出的對話框配置

後臺有個拖動窗體代碼：.net

private void Window_MouseDown(object sender, MouseButtonEventArgs e)
{
    DragMove();
}

4、文章參考

建議直接打開大神視頻學習，他的YouTube上還有不少代碼視頻哦，參考：
參考視頻： Design com WPF： https://www.youtube.com/watch?v=Dwi9o3K73XM

5、代碼下載

文章中代碼已經所有貼出。

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