winform 关于Messagebox自动定时关闭

添加一个类库MessageBoxTimeOut

   public class MessageBoxTimeOut
        {
            private string _caption;

            public void Show(string text, string caption)
            {
                Show(, text, caption);
            }
            public void Show(int timeout, string text, string caption)
            {
                Show(timeout, text, caption, MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            public void Show(int timeout, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
            {
                this._caption = caption;
                StartTimer(timeout);
                MessageBox.Show(text, caption, buttons, icon);
            }
            private void StartTimer(int interval)
            {
            System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
                timer.Interval = interval;
                timer.Tick += new EventHandler(Timer_Tick);
                timer.Enabled = true;
            }
            private void Timer_Tick(object sender, EventArgs e)
            {
                KillMessageBox();
                //停止计时器
                ((System.Windows.Forms.Timer)sender).Enabled = false;
            }
            [DllImport("User32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
            private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);
            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            public static extern int PostMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
            public const int WM_CLOSE = 0x10;
            private void KillMessageBox()
            {
                //查找MessageBox的弹出窗口,注意对应标题
                IntPtr ptr = FindWindow(null, this._caption);
                if (ptr != IntPtr.Zero)
                {
                    //查找到窗口则关闭
                    PostMessage(ptr, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
                }
            }
        }

调用

      MessageBoxTimeOut mb = new MessageBoxTimeOut();
            mb.Show("产品编码不存在!", "提示(窗体3秒后自动关闭...)");