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2010-05-26T15:31:53Z

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==Demonstrate a using alias==

<source lang="csharp">using System;

// Create an alias for Counter.CountDown.
using Count = Counter.MyClass;

namespace Counter {
class MyClass {
}
}

class MainClass {
public static void Main() {
Count cd1 = new Count();
}
}</source>

==Demonstrate the using directive==

<source lang="csharp">using System;

using Counter;

namespace Counter {
class MyClass {
}
}

class MainClass {
public static void Main() {
MyClass cd1 = new MyClass();
}
}</source>

==IDisposable and the using Keyword==

<source lang="csharp">using System;

public class MyClass : IDisposable
{
public MyClass()
{
Console.WriteLine("constructor");
}

~MyClass()
{
Console.WriteLine("destructor");
}

public void Dispose()
{
Console.WriteLine("implementation of IDisposable.Dispose()");
}
}

public class MainClass
{
static void Main()
{
using(MyClass MyObject = new MyClass())
{
}
}
}</source>

==using==

There are two forms of the using directive.
The first form:

<source lang="csharp">using nameOfANameSpace;</source>

==using alias directive==

<source lang="csharp">using MyNameSpaceFormSystem = System;
using MyNameSpaceFormSystemConsole = System.Console;
class MainClass
{
static void Main()
{
MyNameSpaceFormSystem.Console.WriteLine("test");
System.Console.WriteLine("test");
MyNameSpaceFormSystemConsole.WriteLine("test");
}
}</source>
<pre class=codeResult>test
test
test</pre>

==using Statement==

using has a second form that is called the using statement.
It has these general forms:

<source lang="csharp">using (obj) {
// use obj
}

using (type obj = initializer) {
// use obj
}</source>
<OL><LI>obj is an object that is being used inside the using block.</LI><LI>In the first form, the object is declared outside the using statement.</LI><LI>In the second form, the object is declared within the using statement.</LI><LI>When the block concludes, the Dispose() method (defined by the System.IDisposable interface) will be called on obj.</LI><LI>The using statement applies only to objects that implement the System.IDisposable interface.</LI></OL>

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в 15:31, 26 мая 2010

Admin: 1 версия