MessageBox.Show相信用.net开发程序的同仁们都非常熟悉。这个弹出窗口的函数有很多优点,可以编辑显示内容,可以编辑窗口名称,可以指定显示哪些按钮,可以指定提示图标,可以自动排文同时调整窗体大小,可以...,可以的确实很多,信手拈来很方便。但无论多么强大的控件,总会有开发者自己的一些功能需求不能满足。
以下针对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。
在此我将两个方法都完整的写出来,以供参考。
/*------------------------------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, }
笔者(IcyJiang)著。转载请注明出处:http://www.cnblogs.com/icyJ/archive/2012/11/08/AutoClosedMsgBox.html
留文一则交流,二则备用。