[WPF疑难]禁用窗口上的关闭按钮

namespace VersatileMessageBoxLib
{
    using System;
    using System.Windows.Interop;
    using System.Runtime.InteropServices;
    public class CloseButton
    {
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern int GetSystemMenu(int hwnd, int revert);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern int EnableMenuItem(int menu, int ideEnableItem, int enable);
        private const int SC_CLOSE = 0xF060;
        private const int MF_BYCOMMAND = 0x00000000;
        private const int MF_GRAYED = 0x00000001;
        private const int MF_ENABLED = 0x00000002;
        private CloseButton()
        {
        }
        public static void Disable(int handle)
        {
              // The return value specifies the previous state of the menu item
            // (it is either MF_ENABLED or MF_GRAYED). 0xFFFFFFFF indicates that
            // the menu item does not exist.
            switch (EnableMenuItem(GetSystemMenu(handle, 0), SC_CLOSE, MF_BYCOMMAND | MF_GRAYED))
            {
                case MF_ENABLED:
                    break;
                case MF_GRAYED:
                    break;
                case -1:
                    throw new Exception("The Close menu item does not exist.");
                default:
                    break;
            }
        }
    }

在使用时：调用CloseButton.Disable(int handle)方法将窗口句柄传进去就可以了，如果是WPF窗口的化，可以使用           
int handle = new WindowInteropHelper(window).Handle.ToInt32(); 

来取得句柄，WindowForms窗口的句柄是可以直接取得的。