WPF之系统隐藏API,实现自动关闭MessageBox

针对MessageBox的自动关闭功能扩展了一个类和三个静态方法。主要的思路有两个：

1. 在调用MessageBox.Show之前打开一个计时器，计时器的间隔时间由外部通过函数传入。到了计时器的间隔时间后，调用系统的API函数FindWindow和EndDialog来找到弹出窗口并关闭窗口。完成这一切之后停止计时器，释放资源。

2. 直接调用API的隐藏函数MessageBoxTimeout。相较第一个方法来讲，代码量更加少，而且窗口的样式和返回的结果更加多样化，更加灵活。

 

/*------------------------------调用代码----------------------------
  * AutoClosedMsgBox.Show("嘘...\r\n窗口5秒后关闭...", "提示", 5000);
  * AutoClosedMsgBox.Show("嘘...\r\n窗口5秒后关闭...", "提示", 5000, 0);
  * AutoClosedMsgBox.Show("嘘...\r\n窗口5秒后关闭...", "提示", 5000, MsgBoxStyle.OK);
  */
 public class AutoClosedMsgBox
 {
     [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
     static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

     [DllImport("user32.dll")]
     static extern bool EndDialog(IntPtr hDlg, int nResult);

     [DllImport("user32.dll")]
     static extern int MessageBoxTimeout(IntPtr hwnd, string txt, string caption, 
         int wtype, int wlange, int dwtimeout);

     const int WM_CLOSE = 0x10;
     /// <summary>
     /// 弹出自动关闭的MessageBox窗口，只有“确定”按钮
     /// </summary>
     /// <param name="text">弹出窗口的显示内容</param>
     /// <param name="caption">弹出窗口的标题</param>
     /// <param name="milliseconds">窗口持续显示时间(毫秒)</param>
     /// <returns>固定返回DialogResult.OK</returns>
     public static DialogResult Show(string text, string caption, int milliseconds)
     {
         Timer timer = new Timer();
         timer.Interval = milliseconds;
         timer.Tick += (a, b) =>
         {
             IntPtr ptr = FindWindow(null, caption);
             if (ptr != IntPtr.Zero) EndDialog(ptr, 0);
             timer.Stop();
         };
         timer.Start();
         MessageBox.Show(text, caption);
         return DialogResult.OK;
     }

     /// <summary>
     /// 弹出自动关闭的MessageBox窗口，有多种显示方式
     /// </summary>
     /// <param name="txt">弹出窗口的显示内容</param>
     /// <param name="caption">弹出窗口的标题</param>
     /// <param name="style">窗口样式(枚举)</param>
     /// <param name="dwtimeout">窗口持续显示时间(毫秒)</param>
     /// <returns>0-无显示 1-确定 2-取消 3-终止 4-重试 5-忽略 6-是 7-否 10-重试 11-继续 32000-系统关闭</returns>
     public static int Show(string text, string caption, int milliseconds, MsgBoxStyle style)
     {
         return MessageBoxTimeout(IntPtr.Zero, text, caption, (int)style, 0, milliseconds);
     }

     public static int Show(string text, string caption, int milliseconds, int style)
     {
         return MessageBoxTimeout(IntPtr.Zero, text, caption, style, 0, milliseconds);
     }
 }
 public enum MsgBoxStyle
 {
     OK = 0, OKCancel = 1, AbortRetryIgnore = 2, YesNoCancel = 3, YesNo = 4,
     RetryCancel = 5, CancelRetryContinue = 6,

     //红叉 + ...
     RedCritical_OK = 16, RedCritical_OKCancel = 17, RedCritical_AbortRetryIgnore = 18,
     RedCritical_YesNoCancel = 19, RedCritical_YesNo = 20,
     RedCritical_RetryCancel = 21, RedCritical_CancelRetryContinue = 22,

     //蓝问号 + ...
     BlueQuestion_OK = 32, BlueQuestion_OKCancel = 33, BlueQuestion_AbortRetryIgnore = 34,
     BlueQuestion_YesNoCancel = 35, BlueQuestion_YesNo = 36,
     BlueQuestion_RetryCancel = 37, BlueQuestion_CancelRetryContinue = 38,

     //黄叹号 + ...
     YellowAlert_OK = 48, YellowAlert_OKCancel = 49, YellowAlert_AbortRetryIgnore = 50,
     YellowAlert_YesNoCancel = 51, YellowAlert_YesNo = 52,
     YellowAlert_RetryCancel = 53, YellowAlert_CancelRetryContinue = 54,

     //蓝叹号 + ...
     BlueInfo_OK = 64, BlueInfo_OKCancel = 65, BlueInfo_AbortRetryIgnore = 66,
     BlueInfo_YesNoCancel = 67, BlueInfo_YesNo = 68,
     BlueInfo_RetryCancel = 69, BlueInfo_CancelRetryContinue = 70,
 }

 参考：http://www.cnblogs.com/icyJ/archive/2012/11/08/AutoClosedMsgBox.html