/// <summary>
/// 获取由指定年份表达式计算而得的值，或者设置年份表达式为返回指定值的常量表达式
/// </summary>
/// <param name="year">年份，绝对或相对均可</param>
/// <returns>值</returns>
public double this[int year]
{
get
{
if (year > 1900)
{
return(ExprA(year)());
}
else
{
return(Expr(year)());
}
}
set
{
if (year > 1900)
{
_values[year] = value;
//SetExpr(year, () => value);
}
else
{
_values[CityStatistics.Current.C02 + year] = value;
}
}
}
/// <summary>
/// 获取由指定年份表达式计算而得的值
/// </summary>
/// <param name="year">年份</param>
/// <returns>值</returns>
public double Year(int year)
{
return(ExprA(year)());
}