1
Company com
=
new
Company();
2 com.Departments.Add(
"
HR
"
);
3 com.Departments.Add(
"
Market
"
);
4 com.Departments.Add(
"
Development
"
);
5
6 com.Departments[
0
].Staffs.Add(
"
Alice
"
);
7 com.Departments[
0
].Staffs.Add(
"
Amy
"
);
8 com.Departments[
0
].Staffs.Add(
"
Ellen
"
);
9 com.Departments[
2
].Staffs.Add(
"
Albert
"
);
10 com.Departments[
2
].Staffs.Add(
"
Mark
"
);
11 com.Departments[
2
].Staffs.Add(
"
Kevin
"
);
12 com.Departments[
2
].Staffs.Add(
"
Neil
"
);
13
14 System.Console.WriteLine(com.Departments[
0
].Staffs[
1
].Name);
Company com
=
new
Company();2
com.Departments.Add(
"
HR
"
);3
com.Departments.Add(
"
Market
"
);4
com.Departments.Add(
"
Development
"
);5
6
com.Departments[
0
].Staffs.Add(
"
Alice
"
);7
com.Departments[
0
].Staffs.Add(
"
Amy
"
);8
com.Departments[
0
].Staffs.Add(
"
Ellen
"
);9
com.Departments[
2
].Staffs.Add(
"
Albert
"
);10
com.Departments[
2
].Staffs.Add(
"
Mark
"
);11
com.Departments[
2
].Staffs.Add(
"
Kevin
"
);12
com.Departments[
2
].Staffs.Add(
"
Neil
"
);13
14
System.Console.WriteLine(com.Departments[
0
].Staffs[
1
].Name);
在循环处理的时候，第14行自然没有什么不好的地方，但如果像14行那样，要直接访问某个部门，用int的索引似乎显得太突兀。
我们优化DepartmentCollection的this索引器，重载this
1
public
Department
this
[
int
index]
2
{
3
set
4
{
5 this.List[index] = value;
6
}
7 get
8 {
9 return (Department)this.List[index];
10 }
11
}
12
13
public
Department
this
[
string
name]
14
{
15 get
16 {
17 for (int i = 0; i <= this.List.Count - 1; i++)
18 {
19 if (((Department)this.List[i]).Name == name)
20 {
21 return this[i];
22 }
23 }
24 return null;
25 }
26
27 }
public
Department
this
[
int
index]2
{3
set4
{5
this.List[index] = value;6
}7
get8
{9
return (Department)this.List[index];10
}11
}
12
13
public
Department
this
[
string
name]14
{15
get16
{17
for (int i = 0; i <= this.List.Count - 1; i++)18
{19
if (((Department)this.List[i]).Name == name)20
{21
return this[i];22
}23
}24
return null;25
}26
27
}
然后，我们继续优化Department
1
public
class
Department
2
{
3 public StaffCollection Staffs = new StaffCollection();
4
5 public Department(string name)
6 {
7 Name = name;
8 }
9 public readonly string Name;
10
11 public Staff this[int index]
12 {
13 set
14 {
15 Staffs[index] = value;
16 }
17 get
18 {
19 return Staffs[index];
20 }
21 }
22 }
public
class
Department2
{3
public StaffCollection Staffs = new StaffCollection();4
5
public Department(string name)6
{7
Name = name;8
}9
public readonly string Name;10
11
public Staff this[int index]12
{13
set14
{15
Staffs[index] = value;16
}17
get18
{19
return Staffs[index];20
}21
}22
}
加了第11行的this。
现在的调用代码是
1
Company com
=
new
Company();
2 com.Departments.Add(
"
HR
"
);
3 com.Departments.Add(
"
Market
"
);
4 com.Departments.Add(
"
Development
"
);
5
6 com.Departments[
0
].Staffs.Add(
"
Alice
"
);
7 com.Departments[
0
].Staffs.Add(
"
Amy
"
);
8 com.Departments[
0
].Staffs.Add(
"
Ellen
"
);
9 com.Departments[
2
].Staffs.Add(
"
Albert
"
);
10 com.Departments[
2
].Staffs.Add(
"
Mark
"
);
11 com.Departments[
2
].Staffs.Add(
"
Kevin
"
);
12 com.Departments[
2
].Staffs.Add(
"
Neil
"
);
13
14 System.Console.WriteLine(com.Departments[
"
Development
"
][
1
].Name);
Company com
=
new
Company();2
com.Departments.Add(
"
HR
"
);3
com.Departments.Add(
"
Market
"
);4
com.Departments.Add(
"
Development
"
);5
6
com.Departments[
0
].Staffs.Add(
"
Alice
"
);7
com.Departments[
0
].Staffs.Add(
"
Amy
"
);8
com.Departments[
0
].Staffs.Add(
"
Ellen
"
);9
com.Departments[
2
].Staffs.Add(
"
Albert
"
);10
com.Departments[
2
].Staffs.Add(
"
Mark
"
);11
com.Departments[
2
].Staffs.Add(
"
Kevin
"
);12
com.Departments[
2
].Staffs.Add(
"
Neil
"
);13
14
System.Console.WriteLine(com.Departments[
"
Development
"
][
1
].Name);
注意第14行，是不是优雅多了啊？
本文转自shyleoking 51CTO博客，原文链接:http://blog.51cto.com/shyleoking/806275
