в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:16:14Z

1 версия

Новая страница

==Create a clone using the Object.MemberwiseClone method because the Employee class contains only string and value types==

<source lang="csharp">using System;
using System.Text;
using System.Collections.Generic;
public class Employee : ICloneable
{
public string Name;
public string Title;
public int Age;
public Employee(string name, string title, int age)
{
Name = name;
Title = title;
Age = age;
}
public object Clone()
{
return MemberwiseClone();
}
public override string ToString()
{
return string.Format("{0} ({1}) - Age {2}", Name, Title, Age);
}
}
public class MainClass
{
public static void Main()
{
Employee em = new Employee("A", "AA", 4);
Employee cloneEmployee = (Employee)em.Clone();
Console.WriteLine("Original Employee:");
Console.WriteLine(em);
Console.WriteLine("Clone Employee:");
Console.WriteLine(cloneEmployee);
Console.WriteLine("*** Make a change to original employee ***");
em.Name = "L";
em.Title = "M";
em.Age = 4;
Console.WriteLine("Original Employee:");
Console.WriteLine(em);
Console.WriteLine("Clone Employee:");
Console.WriteLine(cloneEmployee);
}
}</source>
<pre class=codeResult>Original Employee:
A (AA) - Age 4
Clone Employee:
A (AA) - Age 4
*** Make a change to original employee ***
Original Employee:
L (M) - Age 4
Clone Employee:
A (AA) - Age 4</pre>

==Perform a memberwise clone of myEmployee using the Employee.Copy() method==

<source lang="csharp">using System;
public class Employee
{
public string firstName;
public string lastName;
public Employee(string firstName, string lastName)
{
this.firstName = firstName;
this.lastName = lastName;
}
public void Display()
{
Console.WriteLine("firstName = " + firstName);
Console.WriteLine("lastName = " + lastName);
}
public static Employee Copy(Employee Employee)
{
return (Employee) Employee.MemberwiseClone();
}
}

class MainClass
{
public static void Main()
{
Console.WriteLine("Creating Employee objects");
Employee myEmployee = new Employee("A", "M");
Employee myOtherEmployee = new Employee("B", "N");
Console.WriteLine("myEmployee details:");
myEmployee.Display();
Console.WriteLine("myOtherEmployee details:");
myOtherEmployee.Display();

Console.WriteLine("Performing a memberwise clone of myEmployee to myOldEmployee");
Employee myOldEmployee = Employee.Copy(myEmployee);
Console.WriteLine("myOldEmployee details:");
myOldEmployee.Display();
}
}</source>
<pre class=codeResult>Creating Employee objects
myEmployee details:
firstName = A
lastName = M
myOtherEmployee details:
firstName = B
lastName = N
Performing a memberwise clone of myEmployee to myOldEmployee
myOldEmployee details:
firstName = A
lastName = M</pre>

==Use MemberwiseClone method to clone object==

<source lang="csharp">using System;
class MyValue
{
public MyValue(int count)
{
this.count = count;
}
public int count;
}
class MyObject
{
public MyObject(int count)
{
this.contained = new MyValue(count);
}
public MyObject Clone()
{
Console.WriteLine("Clone");
return((MyObject) MemberwiseClone());
}
public MyValue contained;
}
class MainClass
{
public static void Main()
{
MyObject my = new MyObject(3);
MyObject myClone = my.Clone();
Console.WriteLine("Values: {0} {1}", my.contained.count, myClone.contained.count);
myClone.contained.count = 1;
Console.WriteLine("Values: {0} {1}", my.contained.count, myClone.contained.count);
}
}</source>
<pre class=codeResult>Clone
Values: 3 3
Values: 1 1</pre>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/CSharp Tutorial/Class/MemberwiseClone - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия