C# #define Preprocessor
In this chapter you will learn:
- What is Preprocessing Directives #define
- How to use Preprocessing Directives #define
- Example for Preprocessing Directives #define
- Use the Conditional attribute with #define
Description
The #define directive defines a character sequence called a symbol.
The existence or nonexistence of a symbol can be determined by #if or #elif.
Syntax
The general form for #define:
#define symbol Example
Example,
#define DEBUGLOG/*w w w. j a v a 2 s .c o m*/
using System;
class MainClass
{
public static void Main()
{
#if DEBUGLOG
Console.WriteLine("In Main - Debug Enabled");
#else
Console.WriteLine("In Main - No Debug");
#endif
}
}
The code above generates the following result.
Example 2
Use the Conditional attribute with #define
#define USE_METHOD_1/* w ww . j a va 2 s . c om*/
using System;
using System.Diagnostics;
class MainClass
{
[Conditional("USE_METHOD_1")]
public static void Method1()
{
Console.WriteLine("In Method 1");
}
public static void Main()
{
Console.WriteLine("In Main");
Method1();
}
}
The code above generates the following result.
Next chapter...
What you will learn in the next chapter:
- How to use Preprocessing Directives #if
- Syntax for #if Preprocessing Directive
- Example for #if Preprocessing Directive
- Use #if with #else