Is it possible to disable the "close" button while still being able to close from elsewhere?

Question

I have a winforms application where I want the close button in the top-right corner of the program to instead minimize the program.

I have been able to achieve this by using the form's FormClosing event like this:

this.Hide();
e.Cancel = true;

But this unfortunately also stops any other close buttons I place on the form.

Is there a way to only stop the default button in the top-right but still be able to close the form elsewhere?

@DanielA.White Can you be more specific as to how a boolean can be helpful? Thanks. — Toby Smith, Aug 16 '15 at 01:17

score 2 · Accepted Answer · answered Aug 16 '15 at 01:32

2

This is a simple boolean example:

bool ExitApplication = false;

private void Form1_FormClosing(Object sender, FormClosingEventArgs e) 
{
    switch(ExitApplication)
    {
      case false:
      this.Hide();
      e.Cancel = true;
      break;

      case true:
      break;
    }
}

So when you want to close your application just set ExitApplication to true.

answered Aug 16 '15 at 01:32

Travis Boatman

2,252
16
31

a better way would have been to check for `CloseReason` in `FormClosingEventArgs ` – Parimal Raj Aug 16 '15 at 07:17

score 0 · Answer 2 · answered Aug 16 '15 at 01:17

0

Use this to disable close button from your form at top right corner.

 public partial class Form1 : Form
 {
    const int MfByposition = 0x400;
    [DllImport("User32")]
    private static extern int RemoveMenu(IntPtr hMenu, int nPosition, int wFlags);
    [DllImport("User32")]
    private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
    [DllImport("User32")]
    private static extern int GetMenuItemCount(IntPtr hWnd);
    public Form1()
    {
        InitializeComponent();
        var hMenu = GetSystemMenu(Handle, false);
        var menuItemCount = GetMenuItemCount(hMenu);
        RemoveMenu(hMenu, menuItemCount - 1, MfByposition);
        ...
    }
}

answered Aug 16 '15 at 01:17

NASSER

5,900
7
38
57

Sorry, but it looks a little too complex for me. – Toby Smith Aug 16 '15 at 01:31
I want to understand what I'm using not just copy someone else's work, thanks though! – Toby Smith Aug 16 '15 at 01:36
This is just native DLL method call from user32. – NASSER Aug 16 '15 at 01:38
@user3573985 This is your school homework actually? right? – NASSER Aug 16 '15 at 01:49
It's the middle of summer, who has school work now? xD I'm just teaching myself and haven't got very far yet. – Toby Smith Aug 16 '15 at 01:50
@user3573985 OK alright, don't mind please, follow this link for better explanation regarding Widows API for close button. http://www.codeproject.com/Articles/269129/Csharp-Forms-Close-Button-Example – NASSER Aug 16 '15 at 01:59
here is another source http://stackoverflow.com/questions/7301825/windows-forms-how-to-hide-close-x-button – NASSER Aug 16 '15 at 02:01

score 0 · Answer 3 · answered Aug 16 '15 at 02:44

Another way to disable the "X" in the top right:

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    protected override CreateParams CreateParams
    {
        get
        {
            const int CS_NOCLOSE = 0x200;
            CreateParams cp = base.CreateParams;
            cp.ClassStyle |= CS_NOCLOSE;
            return cp;
        }
    }

}

The form can still be closed programmatically with this.Close();.

Is it possible to disable the "close" button while still being able to close from elsewhere?

3 Answers3