下面的文字,缺省值是在屏幕中间显示。
DialogResult dr = MessageBox.Show("是否要删除此数据?", "删除确认", MessageBoxButtons.OKCancel,MessageBoxIcon.Information,MessageBoxDefaultButton.Button2); if (dr == DialogResult.Cancel) { return; }
要让MessageBoxEx.Show显示在父窗口中间,须要又一次写个以下的类。调用WINAPI函数。
using System; using System.Windows.Forms; using System.Text; using System.Drawing; using System.Runtime.InteropServices; public class MessageBoxEx { private static IWin32Window _owner; private static HookProc _hookProc; private static IntPtr _hHook; public static DialogResult Show(string text) { Initialize(); return MessageBox.Show(text); } public static DialogResult Show(string text, string caption) { Initialize(); return MessageBox.Show(text, caption); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons) { Initialize(); return MessageBox.Show(text, caption, buttons); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon) { Initialize(); return MessageBox.Show(text, caption, buttons, icon); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton) { Initialize(); return MessageBox.Show(text, caption, buttons, icon, defButton); } public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options) { Initialize(); return MessageBox.Show(text, caption, buttons, icon, defButton, options); } public static DialogResult Show(IWin32Window owner, string text) { _owner = owner; Initialize(); return MessageBox.Show(owner, text); } public static DialogResult Show(IWin32Window owner, string text, string caption) { _owner = owner; Initialize(); return MessageBox.Show(owner, text, caption); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons) { _owner = owner; Initialize(); return MessageBox.Show(owner, text, caption, buttons); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon) { _owner = owner; Initialize(); return MessageBox.Show(owner, text, caption, buttons, icon); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton) { _owner = owner; Initialize(); return MessageBox.Show(owner, text, caption, buttons, icon, defButton); } public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options) { _owner = owner; Initialize(); return MessageBox.Show(owner, text, caption, buttons, icon, defButton, options); } public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam); public delegate void TimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime); public const int WH_CALLWNDPROCRET = 12; public enum CbtHookAction : int { HCBT_MOVESIZE = 0, HCBT_MINMAX = 1, HCBT_QS = 2, HCBT_CREATEWND = 3, HCBT_DESTROYWND = 4, HCBT_ACTIVATE = 5, HCBT_CLICKSKIPPED = 6, HCBT_KEYSKIPPED = 7, HCBT_SYSCOMMAND = 8, HCBT_SETFOCUS = 9 } [DllImport("user32.dll")] private static extern bool GetWindowRect(IntPtr hWnd, ref Rectangle lpRect); [DllImport("user32.dll")] private static extern int MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint); [DllImport("User32.dll")] public static extern UIntPtr SetTimer(IntPtr hWnd, UIntPtr nIDEvent, uint uElapse, TimerProc lpTimerFunc); [DllImport("User32.dll")] public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll")] public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); [DllImport("user32.dll")] public static extern int UnhookWindowsHookEx(IntPtr idHook); [DllImport("user32.dll")] public static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll")] public static extern int GetWindowTextLength(IntPtr hWnd); [DllImport("user32.dll")] public static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int maxLength); [DllImport("user32.dll")] public static extern int EndDialog(IntPtr hDlg, IntPtr nResult); [StructLayout(LayoutKind.Sequential)] public struct CWPRETSTRUCT { public IntPtr lResult; public IntPtr lParam; public IntPtr wParam; public uint message; public IntPtr hwnd; } ; static MessageBoxEx() { _hookProc = new HookProc(MessageBoxHookProc); _hHook = IntPtr.Zero; } private static void Initialize() { if (_hHook != IntPtr.Zero) { throw new NotSupportedException("multiple calls are not supported"); } if (_owner != null) { _hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, _hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId()); } } private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam) { if (nCode < 0) { return CallNextHookEx(_hHook, nCode, wParam, lParam); } CWPRETSTRUCT msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT)); IntPtr hook = _hHook; if (msg.message == (int)CbtHookAction.HCBT_ACTIVATE) { try { CenterWindow(msg.hwnd); } finally { UnhookWindowsHookEx(_hHook); _hHook = IntPtr.Zero; } } return CallNextHookEx(hook, nCode, wParam, lParam); } private static void CenterWindow(IntPtr hChildWnd) { Rectangle recChild = new Rectangle(0, 0, 0, 0); bool success = GetWindowRect(hChildWnd, ref recChild); int width = recChild.Width - recChild.X; int height = recChild.Height - recChild.Y; Rectangle recParent = new Rectangle(0, 0, 0, 0); success = GetWindowRect(_owner.Handle, ref recParent); Point ptCenter = new Point(0, 0); ptCenter.X = recParent.X + ((recParent.Width - recParent.X) / 2); ptCenter.Y = recParent.Y + ((recParent.Height - recParent.Y) / 2); Point ptStart = new Point(0, 0); ptStart.X = (ptCenter.X - (width / 2)); ptStart.Y = (ptCenter.Y - (height / 2)); ptStart.X = (ptStart.X < 0) ? 0 : ptStart.X; ptStart.Y = (ptStart.Y < 0) ? 0 : ptStart.Y; int result = MoveWindow(hChildWnd, ptStart.X, ptStart.Y, width, height, false); } }调用方式
DialogResult dr = MessageBoxEx.Show(this,"是否要删除此数据?", "删除确认", MessageBoxButtons.OKCancel, MessageBoxIcon.Information, MessageBoxDefaultButton.Button2); if (dr == DialogResult.Cancel) { return; }
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