в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:14:29Z

1 версия

Новая страница

==Demonstrate the Conditional attribute==

<source lang="csharp">#define TRIAL

using System;
using System.Diagnostics;

class MainClass {

[Conditional("TRIAL")]
void trial() {
Console.WriteLine("Trial version, not for distribution.");
}

[Conditional("RELEASE")]
void release() {
Console.WriteLine("Final release version.");
}

public static void Main() {
MainClass t = new MainClass();

t.trial(); // call only if TRIAL is defined
t.release(); // called only if RELEASE is defined
}
}</source>
<pre class=codeResult>Trial version, not for distribution.</pre>

==The Conditional Attribute==

<OL><LI>The Conditional Attribute allows you to create conditional methods.</LI><LI>A conditional method is invoked only when a specific symbol has been defined via #define.</LI><LI>Otherwise, the method is bypassed.</LI><LI>A conditional method offers an alternative to conditional compilation using #if.</LI><LI>Conditional is another name for System.Diagnostics.ConditionalAttribute.</LI><LI>To use the Conditional attribute, you must include the System.Diagnostics namespace.</LI></OL>
<p>Conditional methods have a few restrictions.</p>
<OL><LI>Conditional methods must return void.</LI><LI>Conditional methods must be members of a class, not an interface.</LI><LI>Conditional methods cannot be preceded with the override keyword.</LI></OL>
10.3.Conditional Attribute
10.3.1.
The Conditional Attribute
10.3.2.
<A href="/Tutorial/CSharp/0200__Attribute/DemonstratetheConditionalattribute.htm">Demonstrate the Conditional attribute</a>
10.3.3.
<A href="/Tutorial/CSharp/0200__Attribute/TheConditionalattributesettinginCompileparameter.htm">The Conditional attribute setting in Compile parameter</a>

==The Conditional attribute setting in Compile parameter==

<source lang="csharp">// csc /define:DEBUG MainClass.cs
using System;
using System.Diagnostics;
public class MyClass {
[Conditional("DEBUG")]
public void OnlyWhenDebugIsDefined( ) {
Console.WriteLine("DEBUG is defined");
}
}

public class MainClass {
public static void Main( ) {
MyClass f = new MyClass( );
f.OnlyWhenDebugIsDefined( );
}
}</source>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/CSharp Tutorial/Attribute/Conditional Attribute - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия