C# 中 MessageBox 定时关闭

WPF中 System.Windows.Forms 的 MessageBox 并未提供定时关闭的功能，所以要实现此目标，需添加一些其他代码，如定时监控等。

需求说明：

弹出提示框后若一定时间内未点击此提示框，则其自动关闭；
弹出提示框后若在规定时间内点击该提示框，则正常返回所选选项数据。

代码如下：

public class MessageBoxTimeOut{private static string _caption;private static Timer timer;private static void StartTimer(int interval){timer = new Timer();timer.Interval = interval * 1000;timer.Tick += (sender, e) =>{IntPtr ptr;if (CheckMessageBox(out ptr)){KillMessageBox(ptr);}//timer.Enabled = false;};timer.Enabled = true;}public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, int timeout){_caption = caption;StartTimer(timeout);DialogResult result = MessageBox.Show(text, caption, buttons, icon);timer.Stop();return result;}[DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);[DllImport("user32.dll")]private static extern bool EndDialog(IntPtr hDlg, out IntPtr nResult);[DllImport("user32.dll", SetLastError = true)]public static extern bool IsWindow(IntPtr hWnd);private static bool CheckMessageBox(out IntPtr ptr){//ptr = FindWindow(null, _caption); // "#32770" 是 MessageBox 的类名ptr = FindWindow("#32770", _caption); return ptr != IntPtr.Zero && IsWindow(ptr);}private static void KillMessageBox(IntPtr ptr){IntPtr res1;EndDialog(ptr, out res1);}}

此时便可正常调用 MessageBox 去弹出定时自动关闭的提示框，代码如下

 //DialogResult result = MessageBox.Show("your message", "title", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
DialogResult result = MessageBoxTimeOut.Show("your message", "title", MessageBoxButtons.OKCancel, MessageBoxIcon.Question, 4);