如何在WPF中创建一个半透明表单

Question

我必须在WPF中开发一个半透明表单，但控件不应该是transperent。我是WPF的新手。

我曾尝试不同的东西等预先设置不透明度= 0.5，但没有结果

请在细节和步骤解释一步

谢谢！

• 我知道AllowTransperency可以被设置为True仅当WindowStyle设置为无，但我需要出示边境以及

UPDATE： 帕夫洛Glazkov，您有什么看法此解决方案

<Window x:Class="WpfApplication1.Window1" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
Title="Window1" Height="300" Width="300" Opacity="1" AllowsTransparency="True" WindowStyle="None" Background="Transparent"> 
<Grid Background="Transparent"> 
    <Border Margin="2,2,12,34" Name="border1" BorderBrush="Lavender" BorderThickness="5" CornerRadius="20,0,20,0"></Border> 
    <Button Height="23" Margin="93,101,110,0" Name="button1" VerticalAlignment="Top" Background="CadetBlue" Foreground="White">Hello WPF</Button> 
    <Button Height="24" Margin="0,8,20,0" Name="button2" VerticalAlignment="Top" HorizontalAlignment="Right" Width="21" Click="button2_Click">X</Button> 
</Grid> 

Answer 1

首先，你需要设置AllowTransperency至True。然后，可以将窗口的背景设置为透明的（至所需的程度）刷：

<Window x:Class="MyWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     WindowStyle="None" 
     AllowsTransparency="True" 
     Background="{DynamicResource WindowBackground}"> 
    <Window.Resources> 
     <SolidColorBrush x:Key="WindowBackground" 
         Color="White" 
         Opacity="0.5"/> 
    </Window.Resources> 
    ... 
</Window> 

请注意，AllowTransperency只能如果WindowStyle组被设置为True到None。

更新： 如果你不想设置WindowStyle到None，并希望保持非标准边框和窗口按钮也将在Windows Vista/7的唯一工作与Windows Aero主题的替代品。

的技巧是，你可以用下面的代码扩展了“玻璃”区域到整个窗口：

public static class WindowUtils 
{ 
    /// <summary> 
    /// Extends the glass area into the client area of the window 
    /// </summary> 
    /// <param name="window">Window to extend the glass on.</param> 
    /// <param name="thikness">Thickness of border to extend.</param> 
    public static void ExtendGlass(this Window window, Thickness thikness) { 
     try { 
      int isGlassEnabled = 0; 
      Win32.DwmIsCompositionEnabled(ref isGlassEnabled); 
      if (Environment.OSVersion.Version.Major > 5 && isGlassEnabled > 0) { 
       // Get the window handle 
       var helper = new WindowInteropHelper(window); 
       var mainWindowSrc = HwndSource.FromHwnd(helper.Handle); 

       if (mainWindowSrc != null) { 
        if (mainWindowSrc.CompositionTarget != null) { 
         mainWindowSrc.CompositionTarget.BackgroundColor = Colors.Transparent; 
        } 

        // Get the dpi of the screen 
        System.Drawing.Graphics desktop = 
         System.Drawing.Graphics.FromHwnd(mainWindowSrc.Handle); 

        float dpiX = desktop.DpiX/96; 
        float dpiY = desktop.DpiY/96; 

        // Set Margins 
        var margins = new MARGINS { 
         cxLeftWidth = (int)(thikness.Left * dpiX), 
         cxRightWidth = (int)(thikness.Right * dpiX), 
         cyBottomHeight = (int)(thikness.Bottom * dpiY), 
         cyTopHeight = (int)(thikness.Top * dpiY) 
        }; 

        window.Background = Brushes.Transparent; 

        Win32.DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins); 
       } 
      } 
      else { 
       window.Background = SystemColors.WindowBrush; 
      } 
     } 
     catch (DllNotFoundException) { 

     } 
    } 
} 

public class Win32 
{ 
    [DllImport("dwmapi.dll")] 
    public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset); 

    [DllImport("dwmapi.dll")] 
    public static extern int DwmIsCompositionEnabled(ref int en); 

    [DllImport("user32.dll")] 
    public static extern bool SetCursorPos(int X, int Y); 


    [DllImport("User32", EntryPoint = "ClientToScreen", SetLastError = true, ExactSpelling = true, CharSet = CharSet.Auto)] 
    public static extern int ClientToScreen(IntPtr hWnd, [In, Out] POINT pt); 
} 

[StructLayout(LayoutKind.Sequential)] 
public struct MARGINS 
{ 
    public int cxLeftWidth; 
    public int cxRightWidth; 
    public int cyTopHeight; 
    public int cyBottomHeight; 
} 

[StructLayout(LayoutKind.Sequential)] 
public class POINT 
{ 
    public int x = 0; 
    public int y = 0; 
} 

到玻璃延伸到你需要调用在该ExtendGlass扩展方法整个窗口窗口的SizeChanged事件处理程序，并通过一个Thickness覆盖整个窗口：

public MyWindow() { 
    InitializeComponent(); 

    SizeChanged += OnSizeChanged; 
} 

private void OnSizeChanged(object sender, SizeChangedEventArgs e) { 
    double horisontalThickness = Width/2; 
    double verticalThickness = Height/2; 

    var glassThickness = new Thickness(horisontalThickness, verticalThickness, horisontalThickness, verticalThickness); 

    this.ExtendGlass(glassThickness); 
} 

Answer 2

你可以尝试this，它会创建一个玻璃背景为你的窗口（看起来像Vista的和Windows7透明效果）

Here是微软进一步的解释。