public DateRangeLister(DateTime minimum, DateTime maximum, DateTimeUnit unit)
: base(minimum, maximum)
{
switch (unit)
{
case DateTimeUnit.Year:
_count = (int)Maximum.Years(Minimum);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddYears(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Month:
_count = (int)Maximum.Months(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddMonths(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Hour:
_count = (int)Maximum.Hours(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddHours(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Minute:
_count = (int)Maximum.Minutes(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddMinutes(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Second:
_count = (int)Maximum.Seconds(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddSeconds(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Millisecond:
_count = (int)Maximum.Milliseconds(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddMilliseconds(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
default: // default to add day
_count = (int)Maximum.Days(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddDays(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
}
}