经常我们会发现,当我们把一个对象列表赋值给另一个对象列表之后,一个改变了,另一个

也跟着改变了,但是这往往不是我们想看到的

那么,怎么办呢?

办法只有一个,那就是让你的对象实现IClonable接口

对象代码:

public 

class Employee : ICloneable

    {

        

public 

int EmployeeID { 

get; 

set; }

        

public 

string LastName { 

get; 

set; }

        

public 

string FirstName { 

get; 

set; }

        

public 

string Title { 

get; 

set; }

        

public 

string City { 

get; 

set; }

        

public 

string Region { 

get; 

set; }

        

public 

string Country { 

get; 

set; }

        

public 

string Notes { 

get; 

set; }

        

public 

override 

string ToString()

        {

            

string format = 

"

Employee ID: {0}\nFirst Name: {1}\n

"

                          + 

"

Last Name: {2}\nTitle: {3}\nCity: {4}\n

"

                          + 

"

Region: {5}\nCountry: {6}\nNotes: {7}\n

";

            

return 

string.Format(format, EmployeeID, FirstName, LastName, Title, City, Region, Country, Notes);

        }

        

        

public Object Clone()

        {  

            Employee cloned = 

new Employee();

            cloned.EmployeeID = 

this.EmployeeID;

            cloned.LastName = 

this.LastName;

            cloned.FirstName = 

this.FirstName;

            cloned.Title = 

this.Title;

            cloned.City = 

this.City;

            cloned.Region = 

this.Region;

            cloned.Country = 

this.Country;

            cloned.Notes = 

this.Notes;

            

return cloned;  

        }

    }

 

测试代码如下:

public 

void Run()

        {

            EmployeesClient employeeClient = 

new EmployeesClient();

            List<Employee> srcEmployeeList = employeeClient.GetAllEmployees();

            Console.WriteLine(

"

Source Employee List:

");

            Console.WriteLine(

"

--------------------------------------------------------------------

");

            Display(srcEmployeeList);

            Console.WriteLine(

"

--------------------------------------------------------------------

");

            Console.WriteLine();

            Console.WriteLine();

            List<Employee> dstEmployeeList = 

new List<Employee>();

            

srcEmployeeList.ForEach(emp => dstEmployeeList.Add(

(Employee)emp.Clone()

));

            

            srcEmployeeList[

0].LastName = 

"

Huang

";

            srcEmployeeList[

0].FirstName = 

"

Lynn

";

            Console.WriteLine(

"

Source Employee List After Change:

");

            Console.WriteLine(

"

--------------------------------------------------------------------

");

            Display(srcEmployeeList);

            Console.WriteLine(

"

--------------------------------------------------------------------

");

            Console.WriteLine();

            Console.WriteLine();

            Console.WriteLine(

"

Dest Employee List:

");

            Console.WriteLine(

"

--------------------------------------------------------------------

");

            Display(dstEmployeeList);

            Console.WriteLine(

"

--------------------------------------------------------------------

");

        }

        

private 

void Display(IList<Employee> employeeList)

        {

            

foreach (Employee employee 

in employeeList)

            {

                Console.WriteLine(employee);

            }

        }

 

运行结果:

 

Source Employee List After Change:

--------------------------------------------------------------------

Employee ID: 1

First Name: Lynn

Last Name: Huang

......

 

 

Dest Employee List:

--------------------------------------------------------------------

Employee ID: 1

First Name: Nancy

Last Name: Davolio

......