C#笔记（18）MessageBox.Show自定义按钮文字

public class MessageBoxEx  
    {  
        public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, string[] buttonTitles)  
        {  
            MessageForm frm = new MessageForm(buttons, buttonTitles); 
            frm.WatchForActivate = true;  
            DialogResult result = MessageBox.Show(frm, text, caption, buttons);  
            frm.Close();  

            return result;  
        }  

        public static DialogResult Show(string text, string caption, MessageBoxButtons buttons,  
            MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, string[] buttonTitles)  
        {  
            MessageForm frm = new MessageForm(buttons, buttonTitles);  
            frm.Show();  
            frm.WatchForActivate = true;  
            DialogResult result = MessageBox.Show(frm, text, caption, buttons, icon, defaultButton);  
            frm.Close();  

            return result;  
        }  

        class MessageForm : Form  
        {  
            IntPtr _handle;  
            MessageBoxButtons _buttons;  
            string[] _buttonTitles = null;  

            bool _watchForActivate = false;  

            public bool WatchForActivate  
            {  
                get { return _watchForActivate; }  
                set { _watchForActivate = value; }  
            }  

            public MessageForm(MessageBoxButtons buttons, string[] buttonTitles)  
            {  
                _buttons = buttons;  
                _buttonTitles = buttonTitles;  

                // Hide self form, and don't show self form in task bar.  
                this.Text = "";  
                this.StartPosition = FormStartPosition.CenterScreen;  
                this.Location = new Point(-32000, -32000);  
                this.ShowInTaskbar = false;  
            }  

            protected override void OnShown(EventArgs e)  
            {  
                base.OnShown(e);  
                // Hide self form, don't show self form even in task list.  
                NativeWin32API.SetWindowPos(this.Handle, IntPtr.Zero, 0, 0, 0, 0, 659);  
            }  

            protected override void WndProc(ref System.Windows.Forms.Message m)  
            {  
                if (_watchForActivate && m.Msg == 0x0006)  
                {  
                    _watchForActivate = false;  
                    _handle = m.LParam;  
                    CheckMsgbox();  
                }  
                base.WndProc(ref m);  
            }  

            private void CheckMsgbox()  
            {  
                if (_buttonTitles == null || _buttonTitles.Length == 0)  
                    return;  

                // Button title index  
                int buttonTitleIndex = 0;  
                // Get the handle of control in current window.  
                IntPtr h = NativeWin32API.GetWindow(_handle, GW_CHILD);  

                // Set those custom titles to the three buttons(Default title are: Yes, No and Cancle).  
                while (h != IntPtr.Zero)  
                {  
                    if (NativeWin32API.GetWindowClassName(h).Equals("Button"))  
                    {  
                        if (_buttonTitles.Length > buttonTitleIndex)  
                        {  
                            // Changes the text of the specified window's title bar (if it has one).   
                            // If the specified window is a control, the text of the control is changed.   
                            // However, SetWindowText cannot change the text of a control in another application.  
                            NativeWin32API.SetWindowText(h, _buttonTitles[buttonTitleIndex]);  

                            buttonTitleIndex++;  
                        }  
                    }  

                    // Get the handle of next control in current window.  
                    h = NativeWin32API.GetWindow(h, GW_HWNDNEXT);  
                }  
            }  
        }  


        public const int GW_CHILD = 5;  
        public const int GW_HWNDNEXT = 2;  

        public class NativeWin32API  
        {  
            [DllImport("user32.dll", CharSet = CharSet.Auto)]  
            public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int Width, int Height, int flags);  
            [DllImport("user32.dll")]  
            public static extern IntPtr GetWindow(IntPtr hWnd, Int32 wCmd);  
            [DllImport("user32.dll")]  
            public static extern bool SetWindowText(IntPtr hWnd, string lpString);  
            [DllImport("user32.dll")]  
            public static extern int GetClassNameW(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)]StringBuilder lpString, int nMaxCount);  

            public static string GetWindowClassName(IntPtr handle)  
            {  
                StringBuilder sb = new StringBuilder(256);  

                // Retrieves the name of the class to which the specified window belongs  
                GetClassNameW(handle, sb, sb.Capacity);  
                return sb.ToString();  
            }  
        }  

    }