WPF 中透明窗口的实现失败

本文关键字：实现 失败 透明窗口 WPF | 更新日期: 2023-09-27 17:56:41

我在这里找到了带有边框的 WPF 透明窗口的实现 C# 带有边框的 WPF 透明窗口。我尝试实现它，但我的窗口不透明。没有错误出来。下面是 xaml 和代码隐藏。

<Window x:Class="WpfApplication9.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Extended Glass in WPF" Height="300" Width="400" 
    Background="Transparent" Loaded="Window_Loaded">
    <Grid ShowGridLines="True" Background="Transparent">
    </Grid>
</Window>

代码隐藏

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.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Runtime.InteropServices;
using System.Drawing;
namespace WpfApplication9
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            var transparancyConverter = new TransparancyConverter(this);
            transparancyConverter.MakeTransparent();
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct MARGINS
        {
            public int cxLeftWidth;      // width of left border that retains its size
            public int cxRightWidth;     // width of right border that retains its size
            public int cyTopHeight;      // height of top border that retains its size
            public int cyBottomHeight;   // height of bottom border that retains its size
        };

        [DllImport("DwmApi.dll")]
        public static extern int DwmExtendFrameIntoClientArea(
            IntPtr hwnd,
            ref MARGINS pMarInset);
    }
    class TransparancyConverter
    {
        private readonly Window _window;
        public TransparancyConverter(Window window)
        {
            _window = window;
        }
        public void MakeTransparent()
        {
            var mainWindowPtr = new WindowInteropHelper(_window).Handle;
            var mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
            if (mainWindowSrc != null)
                if (mainWindowSrc.CompositionTarget != null)
                    mainWindowSrc.CompositionTarget.BackgroundColor = System.Windows.Media.Color.FromArgb(0, 0, 0, 0);
            var margins = new Margins
            {
                cxLeftWidth = 0,
                cxRightWidth = Convert.ToInt32(_window.Width) * Convert.ToInt32(_window.Width),
                cyTopHeight = 0,
                cyBottomHeight = Convert.ToInt32(_window.Height) * Convert.ToInt32(_window.Height)
            };
            if (mainWindowSrc != null) DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct Margins
        {
            public int cxLeftWidth;
            public int cxRightWidth;
            public int cyTopHeight;
            public int cyBottomHeight;
        }
        [DllImport("DwmApi.dll")]
        public static extern int DwmExtendFrameIntoClientArea(IntPtr hwnd, ref Margins pMarInset);
    }
}

此外，我尝试在不保留边框的情况下在代码后面设置基本透明度。人们还将在下面找到我的 xaml 和代码。创建的窗口不是透明的，只有白色背景。在这两个例子中，我做错了什么？我觉得有一个共同点。

<Window x:Class="WpfApplication10.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        x:Name="MainWindowGUI"
        >
    <Grid>
    </Grid>
</Window>

代码隐藏

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.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 WpfApplication10
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += MainView_Loaded;

        }
        void MainView_Loaded(object sender, RoutedEventArgs e)
        {
            Window yourParentWindow = Window.GetWindow(MainWindowGUI);
            yourParentWindow.WindowStyle = WindowStyle.None;
            yourParentWindow.AllowsTransparency = true;
            SolidColorBrush Transparent = new SolidColorBrush(System.Windows.Media.Colors.Transparent);
            yourParentWindow.Background = Transparent;
        }
    }
}

WPF 中透明窗口的实现失败

你需要设置

AllowsTransparency="True" ; 要使其正常工作，您需要设置WindowStyle="None" 。 WindowStyle="None"会丢失您的非工作区（边框、标题栏、最小/最大/关闭按钮），但这很容易解决。

<Window x:Class="WpfApplication9.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Extended Glass in WPF" Height="300" Width="400" 
    Background="Transparent"
    AllowsTransparency="True"
    WindowStyle="None"
    >
    <Grid ShowGridLines="True" Background="Transparent">
    </Grid>
</Window>
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