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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");
5![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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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");
13![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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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。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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我们优化DepartmentCollection的this索引器,重载this
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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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}
12![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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public Department this[string name]
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{
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get
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{
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for (int i = 0; i <= this.List.Count - 1; i++)
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{
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if (((Department)this.List[i]).Name == name)
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{
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return this[i];
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}
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}
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return null;
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}
26![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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然后,我们继续优化Department
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public class Department
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{
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public StaffCollection Staffs = new StaffCollection();
4![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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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;
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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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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Staffs[index] = value;
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}
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get
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{
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return Staffs[index];
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}
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}
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}
加了第11行的this。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
现在的调用代码是
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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");
5![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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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");
13![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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System.Console.WriteLine(com.Departments["Development"][1].Name);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
注意第14行,是不是优雅多了啊?