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Csharp/CSharp Tutorial/Attribute/Obsolete Attribute - История изменений
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в 15:31, 26 мая 2010
2010-05-26T15:31:53Z
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Admin: 1 версия
2010-05-26T12:14:28Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Demonstrate the Obsolete attribute.==<br />
<br />
<br />
<br />
<source lang="csharp">using System; <br />
<br />
class MainClass { <br />
<br />
[Obsolete("Use myMeth2, instead.")] <br />
static int myMethod(int a, int b) { <br />
return 0; <br />
} <br />
<br />
// Improved version of myMethod. <br />
static int myMethod2(int a, int b) { <br />
return 1; <br />
} <br />
<br />
public static void Main() { <br />
// warning displayed for this <br />
Console.WriteLine("4 / 3 is " + myMethod(4, 3)); <br />
<br />
// no warning here <br />
Console.WriteLine("4 / 3 is " + myMethod2(4, 3)); <br />
} <br />
}</source><br />
<pre class=codeResult>4 / 3 is 0<br />
4 / 3 is 1</pre><br />
<br />
==Obsolete attribute: throw an error if the user tries to use Method2==<br />
<br />
<br />
<br />
<source lang="csharp">using System;<br />
class MainClass<br />
{<br />
<br />
[Obsolete("Method2 has been replaced by NewMethod2", true)]<br />
public static int Method2()<br />
{<br />
return 2;<br />
}<br />
public static void Main() <br />
{<br />
Console.WriteLine(Method2());<br />
}<br />
}</source><br />
<pre class=codeResult>ObsoleteattributethrowanerroriftheusertriestouseMethod2.cs(16,21): error CS0619:<br />
"MainClass.Method2()" is obsolete: "Method2 has been replaced by NewMethod2"</pre><br />
<br />
==Obsolete attribute: warn the user that Method is obsolete==<br />
<br />
<br />
<br />
<source lang="csharp">using System;<br />
class MainClass<br />
{<br />
<br />
[Obsolete("Method1 has been replaced by NewMethod1", false)]<br />
public static int Method1()<br />
{<br />
return 1;<br />
}<br />
public static void Main() <br />
{<br />
Console.WriteLine(Method1());<br />
<br />
}<br />
}</source><br />
<pre class=codeResult>ObsoleteattributewarntheuserthatMethodisobsolete.cs(18,21): warning CS0618: "MainClass.Method1()" is<br />
obsolete: "Method1 has been replaced by NewMethod1"<br />
1</pre><br />
<br />
==The Obsolete Attribute==<br />
<br />
<OL><LI>The Obsolete attribute is short for System.ObsoleteAttribute</LI><LI>The Obsolete attribute lets you mark a program element as obsolete.</LI></OL><br />
<p>It has this general form:</p><br />
<br />
<br />
<source lang="csharp">[Obsolete("message")]</source><br />
<br />
==Using ObsoleteAttribute==<br />
<br />
<br />
<br />
<source lang="csharp">using System;<br />
class Program<br />
{<br />
public static void Main()<br />
{<br />
ObsoleteMethod();<br />
}<br />
[Obsolete]<br />
public static void ObsoleteMethod()<br />
{<br />
}<br />
}</source></div>
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