So, when I initially posed the programming challenge #1 I stated:
… since I intended to output HTML, ASP.NET seemed a logical choice. But I was amazed at the amount of code required for such a seemingly simple task (not to mention how ugly code containing <% and %> is!).
Well, it turns out, using plain old C# with a little LINQ to XML functional construction made my solution a lot nicer.
Prerequisites
I created a few DateTimeExtensions to enhance readability, though I could have easily inlined the implementation of each of those methods without any LOC impact.
public static class DateTimeExtensions
{
public static DateTime ToFirstDayOfMonth(this DateTime dt)
{
return new DateTime(dt.Year, dt.Month, 1);
}
public static DateTime ToLastDayOfMonth(this DateTime dt)
{
return new DateTime(dt.Year, dt.Month, DateTime.DaysInMonth(dt.Year, dt.Month));
}
public static DateTime ToFirstDayOfWeek(this DateTime dt)
{
return dt.AddDays(-((int) dt.DayOfWeek));
}
public static DateTime ToLastDayOfWeek(this DateTime dt)
{
return dt.AddDays(6 - ((int) dt.DayOfWeek));
}
}
I also relied on the Slice extension method I’ve previously blogged about.
Solution
static void Main(string[] args)
{
DateTime today = DateTime.Today;
DateTime firstDayOfMonth = today.ToFirstDayOfMonth();
DateTime startCalendar = firstDayOfMonth.ToFirstDayOfWeek();
DateTime lastDayOfMonth = today.ToLastDayOfMonth();
DateTime endCalendar = lastDayOfMonth.ToLastDayOfWeek();
var calendarPrefix =
from day in Enumerable.Range(startCalendar.Day, (firstDayOfMonth - startCalendar).Days)
select new XElement("td", new XAttribute("class", "prevMonth"), day);
var calendarMonth =
from day in Enumerable.Range(1, lastDayOfMonth.Day)
select new XElement("td", day == today.Day ? new XAttribute("class", "today") : null, day);
var calendarSuffix =
from day in Enumerable.Range(1, (endCalendar - lastDayOfMonth).Days)
select new XElement("td", new XAttribute("class", "nextMonth"), day);
var calendar = calendarPrefix.Concat(calendarMonth).Concat(calendarSuffix);
var table = new XElement("table",
new XElement("thead",
new XElement("tr",
from offset in Enumerable.Range(0, 7)
select new XElement("th", startCalendar.AddDays(offset).ToString("ddd")))),
new XElement("tbody",
from week in calendar.Slice(7)
select new XElement("tr", week)));
Console.WriteLine(table);
}
I’d love to see more ways to solve this. If you’ve got a simpler or more beautiful implementation in your favorite programming langauge/web application framework, let me know in the comments of the original post.
