C#判断是否为数字

  public bool IsNumber(String strNumber)
    {
        Regex objNotNumberPattern = new Regex("[^0-9.-]");
        Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");
        Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");
        String strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$";
        String strValidIntegerPattern = "^([-]|[0-9])[0-9]*$";
        Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");
        return !objNotNumberPattern.IsMatch(strNumber) &&
                !objTwoDotPattern.IsMatch(strNumber) &&
                !objTwoMinusPattern.IsMatch(strNumber) &&
                objNumberPattern.IsMatch(strNumber);
    }