asp.net数据四舍五入

#region 数据四舍五入
/// <summary>
/// 四舍五入
/// </summary>
/// <param name="dblnum">源数据</param>
/// <param name="numberprecision">小数位</param>
/// <returns></returns>
private double GetRound(object objnum, int numberprecision)
{
double returnnum = 0;
if (objnum != null)
{
try
{
double dblnum = double.Parse(objnum.ToString());
int tmpNum = dblnum > 0 ? 5 : -5;
double dblreturn = Math.Truncate(dblnum * Math.Pow(10, numberprecision + 1)) + tmpNum;
dblreturn = Math.Truncate(dblreturn / 10) / Math.Pow(10, numberprecision);
returnnum = dblreturn;
}
catch { }
}
return returnnum;
}
#endregion