四舍五入函数---C#

#region 【四舍五入】函数

/// <summary>

/// 四舍五入函数

/// </summary>

/// <param name="value">要转化的数</param>

/// <param name="decimals">小数位数</param>

/// <returns>转化后的数</returns>

private double RoundNew(string value, int decimals)

{

double dValue;

if (value == "" || value == null)

{

value = "0";

}

try

{

dValue = Convert.ToDouble(value);

}

catch (Exception ex)

{

dValue = 0;

}

if (dValue < 0)

{

dValue = Math.Round(dValue + 5 / Math.Pow(10, decimals + 1), decimals, MidpointRounding.AwayFromZero);

}

else if (dValue > 0)

{

dValue = Math.Round(dValue, decimals, MidpointRounding.AwayFromZero);

}

return dValue;

}

#endregion