в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:16:00Z

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==Static Member Functions==

<source lang="csharp">using System;
class MyClass {
public MyClass()
{
instanceCount++;
}
public static int GetInstanceCount()
{
return(instanceCount);
}
static int instanceCount = 0;
}
class MainClass
{
public static void Main()
{
MyClass my = new MyClass();
Console.WriteLine(MyClass.GetInstanceCount());
}
}</source>
<pre class=codeResult>1</pre>

==Use static==

<p>There are several restrictions that apply to static methods:</p>
<OL><LI>A static method does not have a this reference.</LI><LI>A static method can directly call only other static methods.</LI><LI>A static method cannot directly call an instance method of its class.</LI><LI>A static method must directly access only static data.</LI><LI>You can"t directly access a non-static variable from within a static method.</LI><LI>You can"t directly call a non-static method from within a static method.</LI></OL>

<source lang="csharp">using System;

class StaticDemo {
// a static variable
public static int val = 100;

// a static method
public static int valDiv2() {
return val/2;
}
}

class MainClass {
public static void Main() {

Console.WriteLine("Initial value of StaticDemo.val is "
+ StaticDemo.val);

StaticDemo.val = 8;
Console.WriteLine("StaticDemo.val is " + StaticDemo.val);
Console.WriteLine("StaticDemo.valDiv2(): " +
StaticDemo.valDiv2());
}
}</source>
<pre class=codeResult>Initial value of StaticDemo.val is 100
StaticDemo.val is 8
StaticDemo.valDiv2(): 4</pre>

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в 15:31, 26 мая 2010

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