英文:
How to hide Taskbar icon for .NET MAUI desktop application
问题
我已经创建了一个 MAUI 应用程序，我想要隐藏它在任务栏中的图标：
有人知道如何做到吗？
我在互联网上搜索了解决方案，但没有成功。我希望能有一个简单的解决方案。提前谢谢！
英文:
I have created an MAUI app and I want to hide its icon from Taskbar:
Anyone knows how to do it?
I was searching for a solution in internet but without success. I expect to have a simple solution. Thanks in advance!
答案1
得分: 2
因为Maui for Windows基于WinUI 3，所以我参考了这个关于在WinUI 3中从任务栏中移除窗口的案例。我已经测试过了，图标会被隐藏。
在**/Platforms/Windows/App.cs**中添加以下方法：
public partial class App : MauiWinUIApplication
{
/// <summary>
/// Initializes the singleton application object. This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
/// </summary>
public App()
{
InitializeComponent();
}
#region Window styles
[Flags]
public enum ExtendedWindowStyles
{
// ...
WS_EX_TOOLWINDOW = 0x00000080,
// ...
}
public enum GetWindowLongFields
{
// ...
GWL_EXSTYLE = (-20),
// ...
}
[DllImport("user32.dll")]
public static extern IntPtr GetWindowLong(IntPtr hWnd, int nIndex);
public static IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
{
int error = 0;
IntPtr result = IntPtr.Zero;
// Win32 SetWindowLong doesn't clear error on success
SetLastError(0);
if (IntPtr.Size == 4)
{
// use SetWindowLong
Int32 tempResult = IntSetWindowLong(hWnd, nIndex, IntPtrToInt32(dwNewLong));
error = Marshal.GetLastWin32Error();
result = new IntPtr(tempResult);
}
else
{
// use SetWindowLongPtr
result = IntSetWindowLongPtr(hWnd, nIndex, dwNewLong);
error = Marshal.GetLastWin32Error();
}
if ((result == IntPtr.Zero) && (error != 0))
{
throw new System.ComponentModel.Win32Exception(error);
}
return result;
}
[DllImport("user32.dll", EntryPoint = "SetWindowLongPtr", SetLastError = true)]
private static extern IntPtr IntSetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
[DllImport("user32.dll", EntryPoint = "SetWindowLong", SetLastError = true)]
private static extern Int32 IntSetWindowLong(IntPtr hWnd, int nIndex, Int32 dwNewLong);
private static int IntPtrToInt32(IntPtr intPtr)
{
return unchecked((int)intPtr.ToInt64());
}
[DllImport("kernel32.dll", EntryPoint = "SetLastError")]
public static extern void SetLastError(int dwErrorCode);
#endregion
protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
}
在MainPage.cs中：
protected override void OnHandlerChanged()
{
base.OnHandlerChanged();
#if WINDOWS
Microsoft.UI.Xaml.Window window = (Microsoft.UI.Xaml.Window)App.Current.Windows.First<Window>().Handler.PlatformView;
IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(window);
int exStyle = (int)GetWindowLong(hWnd, (int)GetWindowLongFields.GWL_EXSTYLE);
exStyle |= (int)ExtendedWindowStyles.WS_EX_TOOLWINDOW;
SetWindowLong(hWnd, (int)GetWindowLongFields.GWL_EXSTYLE, (IntPtr)exStyle);
#endif
}
结果图片：
英文:
Because the Maui for Windows is based on the WinUI 3, so I refer to this case about Removing the window from the taskbar in WinUI 3. I have tested it and the icon will be hiden.
Add the method in the /Platforms/Windows/App.cs:
public partial class App : MauiWinUIApplication
{
/// <summary>
/// Initializes the singleton application object. This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
/// </summary>
public App()
{
InitializeComponent();
}
#region Window styles
[Flags]
public enum ExtendedWindowStyles
{
// ...
WS_EX_TOOLWINDOW = 0x00000080,
// ...
}
public enum GetWindowLongFields
{
// ...
GWL_EXSTYLE = (-20),
// ...
}
[DllImport("user32.dll")]
public static extern IntPtr GetWindowLong(IntPtr hWnd, int nIndex);
public static IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
{
int error = 0;
IntPtr result = IntPtr.Zero;
// Win32 SetWindowLong doesn't clear error on success
SetLastError(0);
if (IntPtr.Size == 4)
{
// use SetWindowLong
Int32 tempResult = IntSetWindowLong(hWnd, nIndex, IntPtrToInt32(dwNewLong));
error = Marshal.GetLastWin32Error();
result = new IntPtr(tempResult);
}
else
{
// use SetWindowLongPtr
result = IntSetWindowLongPtr(hWnd, nIndex, dwNewLong);
error = Marshal.GetLastWin32Error();
}
if ((result == IntPtr.Zero) && (error != 0))
{
throw new System.ComponentModel.Win32Exception(error);
}
return result;
}
[DllImport("user32.dll", EntryPoint = "SetWindowLongPtr", SetLastError = true)]
private static extern IntPtr IntSetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
[DllImport("user32.dll", EntryPoint = "SetWindowLong", SetLastError = true)]
private static extern Int32 IntSetWindowLong(IntPtr hWnd, int nIndex, Int32 dwNewLong);
private static int IntPtrToInt32(IntPtr intPtr)
{
return unchecked((int)intPtr.ToInt64());
}
[DllImport("kernel32.dll", EntryPoint = "SetLastError")]
public static extern void SetLastError(int dwErrorCode);
#endregion
protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
}
And in the MainPage.cs:
protected override void OnHandlerChanged()
{
base.OnHandlerChanged();
#if WINDOWS
Microsoft.UI.Xaml.Window window = (Microsoft.UI.Xaml.Window)App.Current.Windows.First<Window>().Handler.PlatformView;
IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(window);
int exStyle = (int)GetWindowLong(hWnd, (int)GetWindowLongFields.GWL_EXSTYLE);
exStyle |= (int)ExtendedWindowStyles.WS_EX_TOOLWINDOW;
SetWindowLong(hWnd, (int)GetWindowLongFields.GWL_EXSTYLE, (IntPtr)exStyle);
#endif
}
And the result image:
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