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2010-05-26T15:31:53Z

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==a subclass uses the keyword base to invoke a particular subclass constructor==

<source lang="csharp">using System;
public class Class1 {
public static void Main(string[] args) {
SubClass sc1 = new SubClass();
SubClass sc2 = new SubClass(1, 2);
}
}
public class BaseClass {
public BaseClass() {
Console.WriteLine("Constructing BaseClass (default)");
}
public BaseClass(int i) {
Console.WriteLine("Constructing BaseClass({0})", i);
}
}
public class SubClass : BaseClass {
public SubClass() {
Console.WriteLine("Constructing SubClass (default)");
}
public SubClass(int i1, int i2)
: base(i1) {
Console.WriteLine("Constructing SubClass({0}, {1})",
i1, i2);
}
}</source>

==Use base keyword to access field in the base class==

<source lang="csharp">using System;
class BaseClass
{
public string Field1 = "In the base class";
}
class DerivedClass : BaseClass
{
new public string Field1 = "In the derived class";
public void Display()
{
Console.WriteLine("{0}", Field1); // Access the derived class.
Console.WriteLine("{0}", base.Field1); // Access the base class.
}
}
class Program
{
static void Main()
{
DerivedClass oc = new DerivedClass();
oc.Display();
}
}</source>
<pre class=codeResult>In the derived class
In the base class</pre>

==Using base to Access a Hidden Name==

<p>"base" refers to the base class of the derived class in which it is used.</p>
<p>This usage has the following general form:</p>

<source lang="csharp">base.member</source>

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Csharp/CSharp Tutorial/Class/base - История изменений

в 15:31, 26 мая 2010

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