Question

我有以下代码：

public class BaseEmployee
{
   public bool Status {get;set;}
   public DateTime DateOfJoining {get;set;}
}

public class Employee : BaseEmployee
{
   public string Name {get;set;}
   public string City {get;set;}
   public string State {get;set;}
}



foreach(var record in records)
{
  var employee = GetDefaultBaseEmployeeProperties();
  employee.Name = record.Name
  employee.State = record.Name;
  employee.City = record.city;

  Department.Employess.Add(employee)

 }

当我这样做时，所有员工都会获得与最后一名员工相同的姓名，城市和州的更新。所以为了解决我所做的参考问题

 Department.Employees.Add(new Employee {
        Name = record.Name;
        City = record.City;
        State = record.State;
   });

但是这种方法的问题在于我松开了员工对象中的BaseEmployee属性。

我需要一种方法将员工添加到Department.Employees保留基本属性。来自你们的任何想法，而不涉及基类。

仅供参考：将基类属性移动到employee类不是一种选择。

Answer 1

如果您描述的行为确实与您发布的代码一起出现，那么只有一个结论：

GetDefaultBaseEmployeeProperties()都会返回相同的 Employee实例。

这很糟糕，正如你所目睹的那样。修复GetDefaultBaseEmployeeProperties()以使其每次都返回新 Employee实例。

编辑：如果您无法更改GetDefaultBaseEmployeeProperties()，则可以复制属性，如下所示：

var template = GetDefaultBaseEmployeeProperties();

foreach(var record in records)
{
    var employee = new Employee();      // create a *new* Employee instance

    employee.Status = template.Status;  // copy default properties
    employee.DateOfJoining = template.DateOfJoining;

    employee.Name = record.Name;        // fill Employee with new values
    employee.State = record.State;
    employee.City = record.city;

    Department.Employees.Add(employee);
}

Answer 2

尝试这样做，让我们知道它是否有效：

foreach(var record in records)
{
  var temp = record; // there is sometimes a bug with fireach iterators last item.

  var employee = GetDefaultBaseEmployeeProperties();
  employee.Name = temp .Name
  employee.State = temp.State;  // you have a bug here in your original code.
  employee.City = temp.city;

  Department.Employess.Add(employee)
 }

将对象添加到列表中

2 个答案: