Is it possible to display a wpf window without an

问题:

As we all know, if the icon for a wpf window is undefined then the default icon is displayed. I want to display a window without any icon in the title bar. I realise that I could use a blank image, however this would cause the text in the title bar to be offset to the right.

Does anyone know of a way to completely remove the icon?

(I tried searching for a similar question but couldn't find anything.)

回答1:

Simple, add this code to your window:

[DllImport("user32.dll")]
static extern uint GetWindowLong(IntPtr hWnd, int nIndex);

[DllImport("user32.dll")]
static extern int SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong);

private const int GWL_STYLE = -16;

private const uint WS_SYSMENU = 0x80000;

protected override void OnSourceInitialized(EventArgs e)
{
    IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(this).Handle;
    SetWindowLong(hwnd, GWL_STYLE,
        GetWindowLong(hwnd, GWL_STYLE) & (0xFFFFFFFF ^ WS_SYSMENU));

    base.OnSourceInitialized(e);
}

回答2:

While not exactly a proper solution, you could try one of the following things:

1. Setting the WindowStyle-Property to ToolWindow will make the Icon disappear, but the title bar (obviously) will be smaller.

2. Write a ControlTemplate for the whole Window. Depending on if the Window has to look like a "real" Window, there'd be much effort into trying to recreate the default Style in the Template.

回答3:

No, this doesn't seem to be possible. Quoting from the documentation of the Icon property (emphasis mine):

A WPF window always displays an icon. When one is not provided by setting Icon, WPF chooses an icon to display based on the following rules:

1. Use the assembly icon, if specified.
2. If the assembly icon is not specified, use the default Microsoft Windows icon.

If you use Icon to specify a custom window icon, you can restore the default application icon by setting Icon to null.

So, apparently a completely transparent icon seems to be your best bet here. Or perhaps hack around all this by using Windows API functions to set the appropriate style on the window. But this may interfere with WPF's window management.

回答4:

I know this is answered, however Dan Rigsby's blog has an article that shows how to do this without hiding the minimize/maximize boxes.

I found this was frustrating me as I was using the articles (here and here but it kept hiding all the buttons when the sysmenu was hidden, to help I created this helper which as shown above call in OnSourceInitialized.

public static class WpfWindowHelper {

    [DllImport("user32.dll")]
    public static extern int GetWindowLong(IntPtr hwnd, int index);
    [DllImport("user32.dll")]
    public static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle);
    [DllImport("user32.dll")]
    public static extern bool SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter, int x, int y, int width, int height, uint flags);

    public const int GWL_EXSTYLE = -20;
    public const int WS_EX_DLGMODALFRAME = 0x0001;
    public const int SWP_NOSIZE = 0x0001;
    public const int SWP_NOMOVE = 0x0002;
    public const int SWP_NOZORDER = 0x0004;
    public const int SWP_FRAMECHANGED = 0x0020;
    public const int GWL_STYLE = -16;
    public const int WS_MAXIMIZEBOX = 0x00010000;
    public const int WS_MINIMIZEBOX = 0x00020000;
    public const int WS_SYSMENU = 0x00080000;

    public static void HideSysMenu(this Window w) {
        IntPtr hwnd = new WindowInteropHelper(w).Handle;
        int extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
        SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_DLGMODALFRAME);
        SetWindowPos(hwnd, IntPtr.Zero, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);
    }

    public static void HideMinimizeBox(this Window w) {
        IntPtr hwnd = new WindowInteropHelper(w).Handle;
        SetWindowLong(hwnd, GWL_STYLE,
            GetWindowLong(hwnd, GWL_STYLE) & ~(WS_MINIMIZEBOX));
    }

    public static void HideMaximizeBox(this Window w) {
        IntPtr hwnd = new WindowInteropHelper(w).Handle;
        SetWindowLong(hwnd, GWL_STYLE,
            GetWindowLong(hwnd, GWL_STYLE) & ~(WS_MAXIMIZEBOX));
    }

    public static void HideMinimizeAndMaximizeBoxes(this Window w) {
        IntPtr hwnd = new WindowInteropHelper(w).Handle;
        SetWindowLong(hwnd, GWL_STYLE,
            GetWindowLong(hwnd, GWL_STYLE) & ~(WS_MAXIMIZEBOX | WS_MINIMIZEBOX));
    }

}

回答5:

You can use an empty png image and convert it to icon and set it as icon for your window!!!

回答6:

My first suggestion would be don't do it. In WinForms you can use types of formborderstyles to create a dialog box that has no icon, but only because that is a Windows standard. Only forms with those specific border types should have no icon; it's what users expect.