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C# DayOfWeek
Use the DayOfWeek enum type, which contains Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.DayOfWeek. Seven days are in each week. We 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).Enum
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.
DateTimeDateTime.NowNext: 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.
C# program that uses DayOfWeek enum
using System;
class Program
{
static void Main()
{
// Get currrent 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);
}
}
Output
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.
ListForeachC# program that uses List of DayOfWeek values
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}");
}
}
}
Output
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.
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- C# sizeof Keyword
- C# Skip and SkipWhile Examples
- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression