Disable Close Button In Title Bar of a WPF Window (C#)

Question

I'd like to know how to disable (not remove/hide) the Close button in a WPF window. I know how to hide it which makes the window's title bar look like this:

But I want to disable it meaning it should look like this:

I'm scripting in C# and using WPF (Windows Presentation Foundation).

Answer 1

Try this:

public partial class MainWindow : Window
{

    [DllImport("user32.dll")]
    static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

    [DllImport("user32.dll")]
    static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);


    const uint MF_BYCOMMAND = 0x00000000;
    const uint MF_GRAYED = 0x00000001;

    const uint SC_CLOSE = 0xF060;

    public MainWindow()
    {
        InitializeComponent();
    }

    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized(e);

        // Disable close button
        IntPtr hwnd = new WindowInteropHelper(this).Handle;
        IntPtr hMenu = GetSystemMenu(hwnd, false);
        if (hMenu != IntPtr.Zero)
        {
            EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);
        }
    }
}

Taken from here (edit: link is broken).

Make sure you set the ResizeMode to NoResize.

Answer 2

You have to override and in OnCLosing event set e.cancel=true

public MyWindow()
{
    InitializeComponent();
    this.Closing += new System.ComponentModel.CancelEventHandler(MyWindow_Closing);
}

void MyWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
    e.Cancel = true;
}