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==A list of preprocessor commands available in C#:==

<source lang="csharp">#define
#undef
#if
#else
#elif
#endif
#line
#error
#warning
#region

#pragma</source>

==Preprocessing Directives: define==

<OL><LI>The #define directive defines a character sequence called a symbol.</LI><LI>The existence or nonexistence of a symbol can be determined by #if or #elif</LI></OL>
<p>The general form for #define:</p>

<source lang="csharp">#define symbol</source>

==Use a symbol expression.==

<source lang="csharp">#define AAA
#define BBB

using System;

class MainClass {
public static void Main() {

#if AAA
Console.WriteLine("Compiled for AAA version.");
#endif

#if AAA && BBB
Console.Error.WriteLine("Testing AAA and BBB version.");
#endif

Console.WriteLine("This is in all versions.");
}
}</source>
<pre class=codeResult>Compiled for AAA version.
Testing AAA and BBB version.
This is in all versions.</pre>

==Use the Conditional attribute with define==

<source lang="csharp">#define USE_METHOD_1
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();
}
}</source>
<pre class=codeResult>In Main
In Method 1</pre>

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в 15:31, 26 мая 2010

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