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是否是数字


        /// <summary>
        /// 是否是数字(能转换为Double的数据)
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool IsNumeric(object value)
        {
            bool result = true;
            if (value == null)
            {
                return false;
            }
            else if (value is string)
            {
                if (value.ToString() == "")
                {
                    return false;
                }
                else
                {
                    Regex regex = new Regex(@"^[+-]?/d+[.]?/d*$");
                    result = regex.IsMatch(value.ToString());
                    if (result)
                    {
                        try
                        {
                            Convert.ToDouble(value);
                        }
                        catch
                        {
                            result = false;
                        }
                    }
                    else
                    {
                        return false;
                    }
                }
            }
            else if (value is Int64 || value is decimal || value is double)
            {
                return true;
            }
            else
            {
                try
                {
                    Convert.ToDouble(value);
                }
                catch
                {
                    result = false;
                }
            }
            return result;
        }

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