Microsoft 将此作为学习泛型的冒泡排序示例。直到我到达第 76 和 77 行才有意义。这些声明是如何可能的？节点是一个类。您不必用 new 实例化它吗？您将如何优化排序？哪个部分是通用的，哪个是非通用的？
1 public class GenericList<T> : System.Collections.Generic.IEnumerable<T>
2 {
3 protected Node head;
4 protected Node current = null;
5
6 // Nested class is also generic on T
7 protected class Node
8 {
9 public Node next;
10 private T data; //T as private member datatype
11
12 public Node(T t) //T used in non-generic constructor
13 {
14 next = null;
15 data = t;
16 }
17
18 public Node Next
19 {
20 get { return next; }
21 set { next = value; }
22 }
23
24 public T Data //T as return type of property
25 {
26 get { return data; }
27 set { data = value; }
28 }
29 }
30
31 public GenericList() //constructor
32 {
33 head = null;
34 }
35
36 public void AddHead(T t) //T as method parameter type
37 {
38 Node n = new Node(t);
39 n.Next = head;
40 head = n;
41 }
42
43 // Implementation of the iterator
44 public System.Collections.Generic.IEnumerator<T> GetEnumerator()
45 {
46 Node current = head;
47 while (current != null)
48 {
49 yield return current.Data;
50 current = current.Next;
51
52 }
53 }
54
55 System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
56 {
57 return GetEnumerator();
58 }
59 }
60
61 public class SortedList<T> : GenericList<T> where T : System.IComparable<T>
62 {
63 // A simple, unoptimized sort algorithm that
64 // orders list elements from lowest to highest:
65
66 public void BubbleSort()
67 {
68 if (null == head || null == head.Next)
69 {
70 return;
71 }
72 bool swapped;
73
74 do
75 {
76 Node previous = null;
77 Node current = head;
78
79
80 //Console.WriteLine(previous.GetType());
81 //Console.ReadLine();
82
83 swapped = false;
84
85
86 //Debug.WriteLine(p);
87 //Debug.WriteLine("Testing " + current.ToString());
88
89 while (current.next != null)
90 {
91 // Because we need to call this method, the SortedList
92 // class is constrained on IEnumerable<T>
93 if (current.Data.CompareTo(current.next.Data) > 0)
94 {
95 Node tmp = current.next;
96 current.next = current.next.next;
97 tmp.next = current;
98
99 if (previous == null)
100 {
101 head = tmp;
102 }
103 else
104 {
105 previous.next = tmp;
106 }
107 previous = tmp;
108 swapped = true;
109 }
110 else
111 {
112 previous = current;
113 current = current.next;
114 }
115 }
116 } while (swapped);
117 }
118 }