bool Double.TryParse(string, out double)Int32.TryParse           string strInt="37";           int  iOut;           if (Int32.TryParse(strInt, out iOut))           {               int iRet = iOut;           }double.TryParse           string strNumber = "123";          double dRet;           if (double.TryParse(strNumber, out dRet))           {               double dCurrent = dRet;           }如果字符串格式不满足转换的要求，Parse方法将会引发一个异常；TryParse方法则不会引发异常，它会返回false，同时将result置为0。DateTime.TryParse           string strDt = "10-25-2012";           DateTime dt;           if (DateTime.TryParse(strDt, out dt))           {            }Decimal.TryParse();