DayOfWeek. 7 days are in each week. In C# programs we can determine if a certain date is a Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday.
The DayOfWeek property, and the DayOfWeek enum type, can be used for this purpose. These 2 types have the same name, but are different (and often used together).
Initial example. To begin, we look at a program that acquires the current DayOfWeek. You can use either DateTime.Now or DateTime.Today to get the current day.
Then You can take the DayOfWeek from the DateTime instance. DayOfWeek is a property, and also an enum type.
Next We use if or switch on a DayOfWeek. We test what day of the week was found using an if-expression.
And In the example output, the DO WORK line only appears if the program was run on a Monday.
Finally We print (with Console.WriteLine) all the values of the DayOfWeek enum for completeness.
using System;
class Program
{
static void Main()
{
// Get current day of week.
DayOfWeek today = DateTime.Today.DayOfWeek;
Console.WriteLine("Today is {0}", today);
// Test current day of week.
if (today == DayOfWeek.Monday)
{
Console.WriteLine("DO WORK");
}
// Demonstrate all DayOfWeek values.
Console.WriteLine("{0}, {1}, {2}, {3}, {4}, {5}, {6}",
DayOfWeek.Monday,
DayOfWeek.Tuesday,
DayOfWeek.Wednesday,
DayOfWeek.Thursday,
DayOfWeek.Friday,
DayOfWeek.Saturday,
DayOfWeek.Sunday);
}
}Today is Monday
DO WORK
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
Day list. We can use DayOfWeek in collections like a list. We do not need to use the DayOfWeek property in the same program as the DayOfWeek enum.
Here We use the DayOfWeek enum to represent work days in a List. We then loop over and print the day names.
using System;
using System.Collections.Generic;
class Program
{
static void Main()
{
// Use a DayOfWeek list.
List<DayOfWeek> workDays = new List<DayOfWeek>();
workDays.Add(DayOfWeek.Monday);
workDays.Add(DayOfWeek.Wednesday);
// Loop over list of days.
foreach (var day in workDays)
{
Console.WriteLine($"WORK DAY: {day}");
}
}
}WORK DAY: Monday
WORK DAY: Wednesday
A summary. The DayOfWeek enum is a convenient type for representing the day of the week as a small value. This type can be used anywhere.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
