從C＃中的類列表中顯示數據＃

Question

我想顯示具有用戶定義類型數據的列表中的數據。

這裏是我的類

namespace test 
{ 
class Employee 
{ 
    private string employeeName; 
    private string employeeId; 

    public override string ToString() 
    { 
     return "Employee Name: " + EmployeeName + "\nEmployee ID: " + EmployeeId; 
    } 

    public string EmployeeName 
    { 
     get { return employeeName; } 
     set { employeeName = value;} 
    } 

    public string EmployeeId 
    { 
     get { return employeeId; } 
     set { employeeId = value;} 
    } 
} 
} 

這裏是我的主要方法，

namespace test 
{ 
class Program 
{ 
    static void Main(string[] args) 
    { 
     Employee employees = new Employee(); 
     List<Employee> listEmployee = new List<Employee>(); 

     employees.EmployeeName = "TEST 1"; 
     employees.EmployeeId = "01"; 

     listEmployee.Add(employees); 

     employees.EmployeeName = "TEST 2"; 
     employees.EmployeeId = "02"; 

     listEmployee.Add(employees); 

     Console.WriteLine("Number of Employee in the list: "+ listEmployee.Count); 
     Console.WriteLine(); 

     foreach (Employee em in listEmployee) 
     { 
      Console.WriteLine(em); 
      Console.WriteLine(); 
     } 

    } 
} 
} 

應該顯示輸出，

Number of Employee in the list: 2 

Employee Name: TEST 1 
Employee ID: 01 

Employee Name: TEST 2 
Employee ID: 02 

但它表明，

Number of Employee in the list: 2 

Employee Name: TEST 2 
Employee ID: 02 

Employee Name: TEST 2 
Employee ID: 02 

請告訴我爲什麼我沒有得到預期的輸出以及如何克服這一點。

預先感謝您。 :)

Answer 1

您可能對object和reference有誤解。

添加對象，即employees到列表：

在這裏，列表的第一個元素保存reference到object。因此，當你在對象上進行修改，就變成

然後你再次插入對象到列表中，因此該列表的第二位置也持參考employees。

將其添加到列表之前，您應該創建一個新的對象（與新參考） -

Employee employees2 = new Employee(); 
employees2.EmployeeName = "TEST 2"; 
employees2.EmployeeId = "02"; 

listEmployee.Add(employees2); 

Answer 2

修改後的主要

static void Main(string[] args) 
{ 
    Employee employeeFirst = new Employee(); 
    List<Employee> listEmployee = new List<Employee>(); 

    employeeFirst.EmployeeName = "TEST 1"; 
    employeeFirst.EmployeeId = "01"; 

    listEmployee.Add(employeeFirst); 

    Employee employeeNext = new Employee(); 


    employeeNext.EmployeeName = "TEST 2"; 
    employeeNext.EmployeeId = "02"; 

    listEmployee.Add(employeeNext); 

    Console.WriteLine("Number of Employee in the list: "+ listEmployee.Count); 
    Console.WriteLine(); 

    foreach (Employee em in listEmployee) 
    { 
     Console.WriteLine(em); 
     Console.WriteLine(); 
    } 

}