/// <summary>

    /// 判断是否为小数点数字且带符号

    /// </summary>

    /// <param name="symbol">A:正负,P:正数</param>

    /// <param name="message">小数点位数</param>

    /// <param name="message">需检查的数字参数</param>

    /// <returns>返回值</returns>

    public static bool CheckIsNumberic(string type, string message,int intLength)

    {

        System.Text.RegularExpressions.Regex rex;

        //(@"^\-?\d+(\.\d{1,2})?$")   正负

        //(@"^\d+(\.\d{1,2})?$")  正数

        switch (type)    //A  正负数  P 正数 positive N 负数 negative

        {

            case "A":

                rex = new System.Text.RegularExpressions.Regex(@"^\-?\d+(\.\d{1," + intLength + "})?$");

                break;

            case "P":

                rex = new System.Text.RegularExpressions.Regex(@"^\d+(\.\d{1," + intLength + "})?$");

                break;

            default:

                rex = new System.Text.RegularExpressions.Regex(@"^\-?\d+(\.\d{1," + intLength + "})?$");

                break;

        }

        if (rex.IsMatch(message))

        {

            return true;

        }

        else

            return false;

    }

//调用，比如不能超过2位小数

     CheckIsNumberic("P", txtUnitPrice.Text.Trim(), )