浅谈对象的深度拷贝 - IClonable接口

一时失言乱红尘 2021-12-24 12:51 140阅读 0赞

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

......

转载于:https://www.cnblogs.com/davidgu/archive/2012/05/31/2528836.html