正则匹配超时处理
使用正则匹配比较大的数据时就会发生程序超时并没有异常弹出，而且电脑cpu会到达100%
在.Net4.5中微软有改进的方法，直接调用很方便，但.Net4.5以下就没有，下面写下自己找的处理方法
1、.Net4.5中：
Regex reg = new Regex(正则, RegexOptions.IgnoreCase, TimeSpan.FromSeconds(2));
TimeSpan.FromSeconds就是设置的超时时间，如超过就返回为空，FromSeconds=2是秒，也可以设置分钟小时
2、.Net4.0中：
1 /// <summary> 2 /// 正则解析 3 /// </summary> 4 /// <param name="regex">正则对象</param> 5 /// <param name="input">需要解析的字符串</param> 6 /// <param name="OutTimeMilliseconds">超时时间</param> 7 /// <returns></returns> 8 public static MatchCollection Matchs(Regex regex, string input, int OutTimeMilliseconds) 9 { 10 MatchCollection mc = null; 11 AutoResetEvent are = new AutoResetEvent(false); 12 Thread t = new Thread(delegate() 13 { 14 mc = regex.Matches(input); 15 //注意,在这里一定要把所有的匹配项遍历一次,不然的话当在此方法外遍历的话.也可能会出现等待情况 16 foreach (Match m in mc) { } 17 are.Set(); 18 }); 19 t.Start(); 20 Wait(t, TimeSpan.FromMilliseconds(OutTimeMilliseconds), are, null); 21 return mc; 22 } 23 24 /// <summary> 25 /// 等待方法执行完成,或超时 26 /// </summary> 27 /// <param name="t"></param> 28 /// <param name="OutTime"></param> 29 /// <param name="ares"></param> 30 private static void Wait(Thread t, TimeSpan OutTime, WaitHandle are, WaitHandle cancelEvent) 31 { 32 WaitHandle[] ares; 33 if (cancelEvent == null) 34 ares = new WaitHandle[] { are }; 35 else 36 ares = new WaitHandle[] { are, cancelEvent }; 37 int index = WaitHandle.WaitAny(ares, OutTime); 38 if ((index != 0) && t.IsAlive)//如果不是执行完成的信号,并且,线程还在执行,那么,结束这个线程 39 { 40 t.Abort(); 41 t = null; 42 } 43 } 44 45 /// <summary> 46 /// 正则解析 47 /// </summary> 48 /// <param name="regex">正则对象</param> 49 /// <param name="input">需要解析的字符串</param> 50 /// <param name="OutTimeMilliseconds">超时时间</param> 51 /// <returns></returns> 52 public static Match Match(Regex regex, string input, int OutTimeMilliseconds) 53 { 54 Match m = null; 55 AutoResetEvent are = new AutoResetEvent(false); 56 Thread t = new Thread(delegate() { m = regex.Match(input); are.Set(); }); 57 t.Start(); 58 Wait(t, TimeSpan.FromMilliseconds(OutTimeMilliseconds), are, null); 59 return m; 60 }
