建立一个自己的集合类（泛型类）-蒲公英云

建立一个自己的集合类（泛型类）

实现IList，具有整型最大集合项的且在构造函数被声明，通过List参数获取项的最初列表，如果添加项超过最大值，抛出一个异常，摘自c#入门经典3

代码

1 public class ShortCollection < T > : IList < T >
2 {
3 protected Collection < T > innerCollection;
4 protected int maxSize = 10 ;
5 public ShortCollection() : this ( 10 )
6 {
7 }
8 public ShortCollection( int size)
9 {
10 maxSize = size;
11 innerCollection = new Collection < T > ();
12 }
13 public ShortCollection(List < T > list) : this ( 10 , list)
14 {
15 }
16 public ShortCollection( int size, List < T > list)
17 {
18 maxSize = size;
19 if (list.Count <= maxSize)
20 {
21 innerCollection = new Collection < T > (list);
22 }
23 else
24 {
25 ThrowTooManyItemsException();
26 }
27 }
28 protected void ThrowTooManyItemsException()
29 {
30 throw new IndexOutOfRangeException(
31 “ Unable to add any more items, maximum size is “ +
32 maxSize.ToString()
33 + “ items. “ );
34 }
35 #region IList Members
36 public int IndexOf(T item)
37 {
38 return (innerCollection as IList < T > ).IndexOf(item);
39 }
40 public void Insert( int index, T item)
41 {
42 if (Count < maxSize)
43 {
44 (innerCollection as IList < T > ).Insert(index, item);
45 }
46 else
47 {
48 ThrowTooManyItemsException();
49 }
50 }
51 public void RemoveAt( int index)
52 {
53 (innerCollection as IList < T > ).RemoveAt(index);
54 }
55 public T this [ int index]
56 {
57 get
58 {
59 return (innerCollection as IList < T > )[index];
60 }
61 set
62 {
63 (innerCollection as IList < T > )[index] = value;
64 }
65 }
66 #endregion
67 #region ICollection Members
68 public void Add(T item)
69 {
70 if (Count < maxSize)
71 {
72 (innerCollection as ICollection < T > ).Add(item);
73 }
74 else
75 {
76 ThrowTooManyItemsException();
77 }
78 }
79 public void Clear()
80 {
81 (innerCollection as ICollection < T > ).Clear();
82 }
83 public bool Contains(T item)
84 {
85 return (innerCollection as ICollection < T > ).Contains(item);
86 }
87 public void CopyTo(T[] array, int arrayIndex)
88 {
89 (innerCollection as ICollection < T > ).CopyTo(array, arrayIndex);
90 }
91 public int Count
92 {
93 get
94 {
95 return (innerCollection as ICollection < T > ).Count;
96 }
97 }
98 public bool IsReadOnly
99 {
100 get
101 {
102 return (innerCollection as ICollection < T > ).IsReadOnly;
103 }
104 }
105 public bool Remove(T item)
106 {
107 return (innerCollection as ICollection < T > ).Remove(item);
108 }
109 #endregion
110 #region IEnumerable Members
111 public IEnumerator < T > GetEnumerator()
112 {
113 return (innerCollection as IEnumerable < T > ).GetEnumerator();
114 }
115 #endregion
116 }