初见继承威力

我们来描述一个数据结构，一个公司，下有很多部门，一个部门有很多职员。

ok，我们先实现职员数据结构

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public class Staff

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{

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//默认为男性

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public Staff(string name):this(name,Sex.Man)

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{

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}

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public Staff(string name,Sex sex)

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{

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Name = name;

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Sex = sex;

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}

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public readonly string Name;

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public readonly Sex Sex;

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}

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public enum Sex

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{

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Man,

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Female

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}
then, 我们再来处理职员的集合

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public class StaffCollection : System.Collections.CollectionBase

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{

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public int Add(string name)

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{

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return Add(name, Sex.Man);

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}

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public int Add(string name, Sex sex)

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{

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return Add(new Staff(name, sex));

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}

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public int Add(Staff staff)

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{

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return this.List.Add(staff);

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}

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public void AddRange(Staff[] staffs)

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{

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for (int i = 0; i <= staffs.Length - 1; i++)

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{

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Add(staffs[i]);

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}

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}

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public void Remove(Staff staff)

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{

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this.List.Remove(staff);

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}

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public Staff[] ToArray()

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{

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Staff[] tmpStaffs = new Staff[this.Count];

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for (int i = 0; i <= this.Count - 1; i++)

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{

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tmpStaffs[i] = (Staff)this[i];

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}

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return tmpStaffs;

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}

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public Staff this[int index]

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{

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set

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{

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this.List[index] = value;

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}

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get

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{

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return (Staff)this.List[index];

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}

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}

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}

我们再定义部门的数据结构，该结构包含了职员的集合

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public class Department

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{

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public StaffCollection Staffs=new StaffCollection();

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public Department(string name)

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{

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Name=name;

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}

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public readonly string Name;

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}

再对StaffCollection依葫芦画瓢，再写一个DepartmentCollection

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public class DepartmentCollection : System.Collections.CollectionBase

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{

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public int Add(string departmentName)

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{

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return Add(new Department(departmentName));

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}

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public int Add(Department department)

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{

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return this.List.Add(department);

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}

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public void AddRange(Department[] departments)

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{

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for (int i = 0; i <= departments.Length - 1; i++)

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{

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Add(departments[i]);

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}

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}

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public void Remove(Department department)

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{

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this.List.Remove(department);

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}

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public Department[] ToArray()

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{

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Department[] tmpDepartments = new Department[this.Count];

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for (int i = 0; i <= this.Count - 1; i++)

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{

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tmpDepartments[i] = (Department)this[i];

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}

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return tmpDepartments;

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}

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public Department this[int index]

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{

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set

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{

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this.List[index] = value;

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}

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get

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{

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return (Department)this.List[index];

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}

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}

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}

注意观察DepartmentCollection和StaffCollection的ToArray方法，封装了ToArray复杂性。

最后，我们实现公司的结构

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public class Company

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{

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public DepartmentCollection Departments = new DepartmentCollection();

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}

现在我们有了5个类

Company

---DepartmentCollection

------Department

---------StaffCollection

------------Staff

我们看下具体的应用

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public static void Main(string[] args)

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{

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Company com = new Company();

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com.Departments.Add("HR");

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com.Departments.Add("Market");

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com.Departments.Add("Development");

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com.Departments[0].Staffs.Add("Alice");

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com.Departments[0].Staffs.Add("Amy");

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com.Departments[0].Staffs.Add("Ellen");

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com.Departments[2].Staffs.Add("Albert");

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com.Departments[2].Staffs.Add("Mark");

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com.Departments[2].Staffs.Add("Kevin");

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com.Departments[2].Staffs.Add("Neil");

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for (int i = 0; i <= com.Departments.Count - 1; i++)

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{

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System.Console.WriteLine(com.Departments[i].Name);

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for (int j = 0; j <= com.Departments[i].Staffs.Count - 1; j++)

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{

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System.Console.WriteLine("/t{0}{1}", com.Departments[i].Staffs[j].Name, com.Departments[i].Staffs[j].Sex == Sex.Man ? "先生" : "女士");

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}

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}

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}

继续优化，请看下篇，索引器的重载