в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:16:01Z

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==Conversions of Classes (Reference Types) to an Interface the Object Might Implement==

<source lang="csharp">using System;
interface Printable
{
string Print();
}
class NonPrintablePaper
{
public NonPrintablePaper(int value)
{
this.value = value;
}
public override string ToString()
{
return(value.ToString());
}
int value;
}
class PrintablePaper: Printable
{
public PrintablePaper(string name)
{
this.name = name;
}
public override string ToString()
{
return(name);
}
string Printable.Print()
{
return("print...");
}
string name;
}
class MainClass
{
public static void TryPrinting(params object[] arr)
{
foreach (object o in arr)
{
Printable printableObject = o as Printable;
if (printableObject != null)
Console.WriteLine("{0}", printableObject.Print());
else
Console.WriteLine("{0}", o);
}
}
public static void Main()
{
NonPrintablePaper s = new NonPrintablePaper(13);
PrintablePaper c = new PrintablePaper("Tracking Test");
TryPrinting(s, c);
}
}</source>
<pre class=codeResult>13
print...</pre>

==Conversions of Classes (Reference Types) To the Base Class of an Object==

<source lang="csharp">using System;
public class Base
{
public virtual void talk()
{
Console.WriteLine("Base");
}
}
public class Derived: Base
{
public override void talk()
{
Console.WriteLine("Derived");
}
}
public class Test
{
public static void Main()
{
Derived d = new Derived();
Base b = d;

b.talk();
Derived d2 = (Derived) b;

object o = d;
Derived d3 = (Derived) o;
}
}</source>
<pre class=codeResult>Derived</pre>

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Csharp/CSharp Tutorial/Class/cast - История изменений

в 15:31, 26 мая 2010

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