public  class EmployeeList{// 员工集合private IList<Employee> empList = new List<Employee>();// 增加员工public void AddEmployee(Employee emp){this.empList.Add(emp);}// 处理员工数据public void Handle(string deptName){if (deptName.Equals("财务部")){foreach (var emp in empList){if (emp.GetType().Equals("FullTimeEmployee")){Console.WriteLine("财务部处理全职员工数据！");}else{Console.WriteLine("财务部处理兼职员工数据！");}}}else if (deptName.Equals("人力资源部")){foreach (var emp in empList){if (emp.GetType().Equals("FullTimeEmployee")){Console.WriteLine("人力资源部处理全职员工数据！");}else{Console.WriteLine("人力资源部处理兼职员工数据！");}}}}}

    /// <summary>/// 抽象元素类：Employee/// </summary>public interface IEmployee{void Accept(Department handler);}

    /// <summary>/// 具体元素类：FullTimeEmployee/// </summary>public class FullTimeEmployee : IEmployee{public string Name { get; set; }public double WeeklyWage { get; set; }public int WorkTime { get; set; }public FullTimeEmployee(string name, double weeklyWage, int workTime){this.Name = name;this.WeeklyWage = weeklyWage;this.WorkTime = workTime;}public void Accept(Department handler){handler.Visit(this);}}/// <summary>/// 具体元素类：PartTimeEmployee/// </summary>public class PartTimeEmployee : IEmployee{public string Name { get; set; }public double HourWage { get; set; }public int WorkTime { get; set; }public PartTimeEmployee(string name, double hourWage, int workTime){this.Name = name;this.HourWage = hourWage;this.WorkTime = workTime;}public void Accept(Department handler){handler.Visit(this);}}

    /// <summary>/// 对象结构类：EmployeeList/// </summary>public class EmployeeList{private IList<IEmployee> empList = new List<IEmployee>();public void AddEmployee(IEmployee emp){this.empList.Add(emp);}public void Accept(Department handler){foreach (var emp in empList){emp.Accept(handler);}}

    /// <summary>/// 抽象访问者类：Department/// </summary>public abstract class Department{// 声明一组重载的访问方法，用于访问不同类型的具体元素public abstract void Visit(FullTimeEmployee employee);public abstract void Visit(PartTimeEmployee employee);}

    /// <summary>/// 具体访问者类：FinanceDepartment/// </summary>public class FinanceDepartment : Department{// 实现财务部对兼职员工数据的访问public override void Visit(PartTimeEmployee employee){int workTime = employee.WorkTime;double hourWage = employee.HourWage;Console.WriteLine("临时工 {0} 实际工资为：{1} 元", employee.Name, workTime * hourWage);}// 实现财务部对全职员工数据的访问public override void Visit(FullTimeEmployee employee){int workTime = employee.WorkTime;double weekWage = employee.WeeklyWage;if (workTime > 40){weekWage = weekWage + (workTime - 40) * 50;}else if (workTime < 40){weekWage = weekWage - (40 - workTime) * 80;if (weekWage < 0){weekWage = 0;}}Console.WriteLine("正式员工 {0} 实际工资为：{1} 元", employee.Name,  weekWage);}}/// <summary>/// 具体访问者类：HRDepartment/// </summary>public class HRDepartment : Department{// 实现人力资源部对兼职员工数据的访问public override void Visit(PartTimeEmployee employee){int workTime = employee.WorkTime;Console.WriteLine("临时工 {0} 实际工作时间为：{1} 小时", employee.Name, workTime);}// 实现人力资源部对全职员工数据的访问public override void Visit(FullTimeEmployee employee){int workTime = employee.WorkTime;Console.WriteLine("正式员工 {0} 实际工作时间为：{1} 小时", employee.Name, workTime);if (workTime > 40){Console.WriteLine("正式员工 {0} 加班时间为：{1} 小时", employee.Name, workTime - 40);}else if (workTime < 40){Console.WriteLine("正式员工 {0} 请假时间为：{1} 小时", employee.Name, 40 - workTime);}}}

    public class Program{public static void Main(string[] args){EmployeeList empList = new EmployeeList();IEmployee fteA = new FullTimeEmployee("梁思成", 3200.00, 45);IEmployee fteB = new FullTimeEmployee("徐志摩", 2000, 40);IEmployee fteC = new FullTimeEmployee("梁徽因", 2400, 38);IEmployee fteD = new PartTimeEmployee("方鸿渐", 80, 20);IEmployee fteE = new PartTimeEmployee("唐宛如", 60, 18);empList.AddEmployee(fteA);empList.AddEmployee(fteB);empList.AddEmployee(fteC);empList.AddEmployee(fteD);empList.AddEmployee(fteE);Department dept = AppConfigHelper.GetDeptInstance() as Department;if (dept != null){empList.Accept(dept);}Console.ReadKey();}}

<?xml version="1.0" encoding="utf-8" ?>
<configuration><appSettings><add key="DeptName" value="Manulife.ChengDu.DesignPattern.Visitor.HRDepartment, Manulife.ChengDu.DesignPattern.Visitor" /></appSettings>
</configuration>

<?xml version="1.0" encoding="utf-8" ?>
<configuration><appSettings><add key="DeptName" value="Manulife.ChengDu.DesignPattern.Visitor.FinanceDepartment, Manulife.ChengDu.DesignPattern.Visitor" /></appSettings>
</configuration>