C# ArrayList - 对象

Question

我的 C# 程序中有三个类。得到以下错误:

Cannot implicitly convert type 'object' to 'Register_Employee.Employee'. An explicit conversion exists (are you missing a cast?) C:\Users\x64\Documents\Visual Studio 2010\Projects\Register Employee\Register Employee\EmployeeList.cs 20 20 Register Employee

我知道问题出在哪里。您必须返回正确类型的对象，但我不知道如何解决。我有一个 Employee 类，一个包含员工和主程序的 EmployeeList 类。

namespace Register_Employee
{
    class EmployeeList
    {
        ArrayList list = new ArrayList();

       public void addEmployee(Employee a)
       {
           this.list.Add(a);
       }

        public Employee GetEmployee(int Index)
        {
            var e = list[Index]; <<<<<The problems
            return e;  <<<<<The problems
        }

    }
}

namespace Register_Employee
{
    class Employee
    {

        public Employee(String iD, String firstName, String lastName)
        {
            this.ID = iD;
            this.FirstName = firstName;
            this.LastName = lastName;
        }

        public String ID { get; set; }
        public String FirstName { get; set; }
        public String LastName { get; set; }


    }
}

提前致谢

Answer 1

如错误消息所述，您需要显式转换:

Employee e = (Employee)list[Index];

此外，您可以使用 List<Employee>而不是 ArrayList。