в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:17:54Z

1 версия

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==Box and unbox a struct==

<source lang="csharp">using System;
struct EMPLOYEE
{
public string name;
public short deptID;
public EMPLOYEE(string n, short d)
{
name = n;
deptID = d;
}
}
class MainClass
{
public static void Main(string[] args) {
EMPLOYEE fred = new EMPLOYEE("s",1);
fred.name = "F";
object stanInBox = fred;

UnboxThisEmployee(stanInBox);
}
public static void UnboxThisEmployee(object o)
{
EMPLOYEE temp = (EMPLOYEE)o;
Console.WriteLine(temp.name);
}

}</source>
<pre class=codeResult>F</pre>

==Box a struct, change its value and unbox it==

<source lang="csharp">public interface IModifyMyStruct
{
int X
{
get;
set;
}
}
public struct MyStruct : IModifyMyStruct
{
public int x;
public int X
{
get
{
return x;
}
set
{
x = value;
}
}
public override string ToString()
{
return x.ToString();
}
}
public class MainClass
{
static void Main()
{
MyStruct myval = new MyStruct();
myval.x = 123;
object obj = myval;
System.Console.WriteLine( "{0}", obj.ToString() );
IModifyMyStruct iface = (IModifyMyStruct) obj;
iface.X = 456;
System.Console.WriteLine( "{0}", obj.ToString() );
MyStruct newval = (MyStruct) obj;
System.Console.WriteLine( "{0}", newval.ToString() );
}
}</source>
<pre class=codeResult>123
456
456</pre>

==Box struct to call its implemented interface==

<source lang="csharp">public interface IDisplay
{
void Print();
}
public struct MyStruct : IDisplay
{
public int x;
public void Print()
{
System.Console.WriteLine( "{0}", x );
}
}
public class MainClass
{
static void Main()
{
MyStruct myval = new MyStruct();
myval.x = 123;
// no boxing
myval.Print();
// must box the value
IDisplay printer = myval;
printer.Print();
}
}</source>
<pre class=codeResult>123
123</pre>

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Csharp/CSharp Tutorial/struct/Box Unbox - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия