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C# Bool Methods, Return True and False
Create methods and properties that return bools. Test for complex conditions.Bool method. A method returns true or false. In this way, it can enhance your code with greater abstraction. Returning true and false from a method is a way to improve the object-orientation of your application. It simplifies it.True, FalseBool
Example. Here we declare a class that has several fields, which determine its state. When you have complex classes, you can expose public methods (or properties) that return calculated bool values.Return
Often: Developers will use the "Is" prefix, to indicate the type of result. This is a convention.
Methods: The methods IsCurrent(), IsEmployee() and the property Fired provide an abstraction of the internal state of the object.
Tip: When you return boolean values, you can chain expressions with logical "AND" and "OR".
Fired: This property returns the value of the internal state member with the same name. Properties allow more flexibility when changing implementations.
PropertyC# program that returns true and false from method
using System;
class Employee
{
bool _fired = false;
bool _hired = true;
int _salary = 10000;
public bool IsCurrent()
{
return !this._fired &&
this._hired &&
this._salary > 0;
}
public bool IsExecutive()
{
return IsCurrent() &&
this._salary > 1000000;
}
public bool Fired
{
get
{
return this._fired;
}
}
}
class Program
{
static void Main()
{
Employee employee = new Employee();
if (employee.IsCurrent())
{
Console.WriteLine("Is currently employed");
}
if (employee.IsExecutive())
{
Console.WriteLine("Is an executive");
}
if (!employee.Fired)
{
Console.WriteLine("Is not fired yet");
}
}
}
Output
Is currently employed
Is not fired yet
Discussion. The bool type is a common type to use as the return type in methods in C# programs. The class above provides the syntax for this pattern. Next, we look at the logic regarding boolean result values and methods that return bools.
Quote: Understanding complicated boolean tests in detail is rarely necessary for understanding program flow (Code Complete).
Summary. We developed a class with methods and properties returning bools. We discussed the principles of abstraction in object-oriented programming, and researched the topic in one of the leading books about software construction.
And: We chained these conditional expressions, with short-circuit expressions, for the clearest code.
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- 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