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C# Define and Undef Directives
Use the #define and #undef preprocessor directives and test the defined constants.Define, undef. The #define and #undef directives influence compilation. They should appear at the top of a source file. They can adjust compilation options for the entire file. As directives, they have no affect on runtime performance.Directives
Info: The undef directive is the opposite of the define directive. It doesn't matter if the symbol was never defined in the first place.
Example. We introduce the #define and #undef directives at the top of the file. We define the symbol B, then the symbol A, then undefine the symbol B. The program will compile with A being defined, and B being undefined.
Undef: In the code, the #undef B cancels out the #define B directive, leaving B not defined.
If: The #if directive is evaluated as preprocessing time, not runtime. It works in a similar way as the if-statement in the C# language itself.
If, Elif, EndifElif, Else: The #elif directive is the same as #if, except it must follow an #if or other #elif. The #else directive is the default case.
Endif: The #endif directive serves to terminate the #if #elif or #if #else directive structures.
C# program that define and undef directives
// Define B, then define A.
// ... You can use undef at the top here too.
// ... Try changing A to C.
#define B
#define A
#undef B
using System;
class Program
{
static void Main()
{
// Use an if/elif/endif construct.
#if A
Console.WriteLine("a");
#elif B
Console.WriteLine("b");
#elif C
Console.WriteLine("c");
#endif
// Use an if/else/endif construct.
#if A
Console.WriteLine("a2");
#else
Console.WriteLine("!a2");
#endif
}
}
Output
a
a2
Notes, symbols. In the C# language, #define is considered a preprocessing directive. There are some invalid syntaxes for defined symbols. You cannot use a number value as the defined identifier, for example.
Tip: Instead of reading the language specification, you can just experiment in the compiler to see what works.
Directives. The term "directive" indicates a line in the program that is not part of the program's execution logic. Directives provide hints about how the program is compiled, not what it does with instructions and the evaluation stack.
Info: In the C# language, the "using System" line is also a directive, but not a preprocessing directive.
Using SystemNote: Please see section 9.5 of the ECMA-344 "C# Language Specification", "Pre-processing directives" for a complete reference.
Summary. We demonstrated the #define and #undef preprocessing directives. These provide a way to conditionally compile or remove parts of the source text. These directives can be a clue that a file is overly complex or not well-organized.
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- 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