#117 – Use #define to Define a Symbol

In addition to defining symbols by specifying them in the project properties dialog (“conditional compilation symbols”), you can define symbols directly in your code using the #define directive.  This is helpful when you want to have a conditional compilation symbol appear in some files, but not throughout the entire project.

Here’s an example.  Note that the #define must be the first thing in the file.

#define LOGGING

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {

#if LOGGING
            DoSomeLogging();
#endif
            uint x = 0x1234;
        }
    }
}
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About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

2 Responses to #117 – Use #define to Define a Symbol

  1. kai zhou says:

    I need to learn something on conditional compilation with C#.
    Thank you Sean.

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