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

1publicclassStaff
2{
3//默认为男性
4publicStaff(stringname):this(name,Sex.Man)
5{
6}
7publicStaff(stringname,Sexsex)
8{
9Name=name;
10Sex=sex;
11}
12
13publicreadonlystringName;
14publicreadonlySexSex;
15}
16
17publicenumSex
18{
19Man,
20Female
21}

then, 我们再来处理职员的集合

1publicclassStaffCollection:System.Collections.CollectionBase
2{
3
4publicintAdd(stringname)
5{
6returnAdd(name,Sex.Man);
7}
8
9publicintAdd(stringname,Sexsex)
10{
11returnAdd(newStaff(name,sex));
12}
13publicintAdd(Staffstaff)
14{
15returnthis.List.Add(staff);
16}
17publicvoidAddRange(Staff[]staffs)
18{
19for(inti=0;i<=staffs.Length-1;i++)
20{
21Add(staffs[i]);
22}
23}
24
25publicvoidRemove(Staffstaff)
26{
27this.List.Remove(staff);
28}
29
30publicStaff[]ToArray()
31{
32Staff[]tmpStaffs=newStaff[this.Count];
33for(inti=0;i<=this.Count-1;i++)
34{
35tmpStaffs[i]=(Staff)this[i];
36}
37returntmpStaffs;
38}
39
40publicStaffthis[intindex]
41{
42set
43{
44this.List[index]=value;
45}
46get
47{
48return(Staff)this.List[index];
49}
50}
51
52}

我们再定义部门的数据结构，该结构包含了职员的集合

1publicclassDepartment
2{
3publicStaffCollectionStaffs=newStaffCollection();
4
5publicDepartment(stringname)
6{
7Name=name;
8}
9publicreadonlystringName;
10}

再对StaffCollection依葫芦画瓢，再写一个DepartmentCollection

1publicclassDepartmentCollection:System.Collections.CollectionBase
2{
3publicintAdd(stringdepartmentName)
4{
5returnAdd(newDepartment(departmentName));
6}
7
8publicintAdd(Departmentdepartment)
9{
10returnthis.List.Add(department);
11}
12publicvoidAddRange(Department[]departments)
13{
14for(inti=0;i<=departments.Length-1;i++)
15{
16Add(departments[i]);
17}
18}
19
20publicvoidRemove(Departmentdepartment)
21{
22this.List.Remove(department);
23}
24
25publicDepartment[]ToArray()
26{
27Department[]tmpDepartments=newDepartment[this.Count];
28for(inti=0;i<=this.Count-1;i++)
29{
30tmpDepartments[i]=(Department)this[i];
31}
32returntmpDepartments;
33}
34
35publicDepartmentthis[intindex]
36{
37set
38{
39this.List[index]=value;
40}
41get
42{
43return(Department)this.List[index];
44}
45}
46
47
48}

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

1publicclassCompany
2{
3publicDepartmentCollectionDepartments=newDepartmentCollection();
4}

现在我们有了5个类
Company
---DepartmentCollection
------Department
---------StaffCollection
------------Staff

我们看下具体的应用

1publicstaticvoidMain(string[]args)
2{
3
4Companycom=newCompany();
5com.Departments.Add("HR");
6com.Departments.Add("Market");
7com.Departments.Add("Development");
8
9com.Departments[0].Staffs.Add("Alice");
10com.Departments[0].Staffs.Add("Amy");
11com.Departments[0].Staffs.Add("Ellen");
12com.Departments[2].Staffs.Add("Albert");
13com.Departments[2].Staffs.Add("Mark");
14com.Departments[2].Staffs.Add("Kevin");
15com.Departments[2].Staffs.Add("Neil");
16
17for(inti=0;i<=com.Departments.Count-1;i++)
18{
19System.Console.WriteLine(com.Departments[i].Name);
20for(intj=0;j<=com.Departments[i].Staffs.Count-1;j++)
21{
22System.Console.WriteLine("/t{0}{1}",com.Departments[i].Staffs[j].Name,com.Departments[i].Staffs[j].Sex==Sex.Man?"先生":"女士");
23}
24}
25
26
27}

继续优化，请看下篇，索引器的重载