建立一个自己的集合类（泛型类）

分手后的思念是犯贱 2022-01-05 19:03 211阅读 0赞

实现IList<T>，具有整型最大集合项的且在构造函数被声明，通过List<T>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

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][] 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<T> 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<T> 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<T> Members   
 111  public  IEnumerator < T >  GetEnumerator()  
 112 \{  
 113  return  (innerCollection  as  IEnumerable < T > ).GetEnumerator();  
 114 \}  
 115  \#endregion   
 116 \}

转载于:https://www.cnblogs.com/authen/archive/2009/12/10/1621483.html

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