[.NET] CastingEnumerable(2)

39             Console.ReadLine();
40         }
41  
42         static IEnumerable<Data> CreateDataList(IEnumerable<User> userList, string decorator)
43         {
44             return new CastingEnumerable<Data, User>(userList, delegate(User user) { return CreateData(user, decorator); });
45         }
46  
47         static Data CreateData(User user, string decorator)
48         {
49             Data data = new Data();
50             data.DisplayName = decorator + user.LastName + "." + user.FirstName + decorator;
51             return data;
52         }
53     }  
54 }

程式碼 :
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01 namespace CLK.Collections
02 {
03     public class CastingEnumerable<TResult, TSource> : IEnumerable<TResult>
04     {
05         //Properties 
06         private readonly IEnumerable<TSource> _sourceEnumerable;
07  
08         private CastingEnumerableDelegate<TResult, TSource> _enumerableDelegate;
09  
10  
11         // Construction 
12         public CastingEnumerable(IEnumerable<TSource> sourceEnumerable, CastingEnumerableDelegate<TResult, TSource> enumerableDelegate)
13         {
14             #region Require
15  
16             if (sourceEnumerable == null) throw new ArgumentNullException();
17             if (enumerableDelegate == null) throw new ArgumentNullException();
18  
19             #endregion
20             _sourceEnumerable = sourceEnumerable;
21             _enumerableDelegate = enumerableDelegate;