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[C#] C#中System.Collections.Generic 下的各个容器类的用法 →→→→→进入此内容的聊天室

来自 , 2021-03-21, 写在 C#, 查看 148 次.
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  1. System.Collections.Generic.Dictionary<>;       //键/值对集合
  2. System.Collections.Generic.KeyValuePair<>;     //键/值对结构, 作为 Dictionary<> 的一个元素存在
  3. System.Collections.Generic.SortedDictionary<>; //相当于 Key 能自动排序 Dictionary<>
  4. System.Collections.Generic.SortedList<>;       //和 SortedDictionary<> 功能相似, 但内部算法不同, 其 Keys、Values 可通过索引访问
  5.  
  6. System.Collections.Generic.HashSet<>;   //无序、无重复的元素集合
  7. System.Collections.Generic.SortedSet<>; //相当于能自动排序的 HashSet<>
  8. System.Collections.Generic.List<>;      //相当于泛型的 ArrayList, 元素可重复、可排序、可插入、可索引访问
  9.  
  10. System.Collections.Generic.Queue<>; //队列, 先进先出
  11. System.Collections.Generic.Stack<>; //堆栈, 后进先出
  12.  
  13. System.Collections.Generic.LinkedList<>;     //双向链表
  14. System.Collections.Generic.LinkedListNode<>; //LinkedList<> 的节点
  15.  
  16. System.Collections.Generic.SynchronizedCollection<>;         //线程安全的集合
  17. System.Collections.Generic.SynchronizedReadOnlyCollection<>; //线程安全的只读集合
  18. System.Collections.Generic.SynchronizedKeyedCollection<>;    //线程安全的键/值集合
  19.  
  20. Dictionary<>、KeyValuePair<>:
  21. protected void Button1_Click(object sender, EventArgs e)
  22. {
  23.     Dictionary<string, int> dict = new Dictionary<string, int>();
  24.     dict.Add("K1", 123);
  25.     dict["K2"] = 456;
  26.     dict.Add("K3", 789);
  27.  
  28.     string str = "";
  29.     foreach (KeyValuePair<string, int> k in dict)
  30.     {
  31.         str += string.Format("{0}-{1}; ", k.Key, k.Value); //K1-123; K2-456; K3-789;
  32.     }
  33.     TextBox1.Text = str;
  34. }
  35.  
  36. SortedDictionary<>:
  37. protected void Button1_Click(object sender, EventArgs e)
  38. {
  39.     SortedDictionary<string, int> dict = new SortedDictionary<string, int>();
  40.     dict.Add("K3", 333);
  41.     dict["K1"] = 111;
  42.     dict.Add("K2", 222);
  43.  
  44.     SortedDictionary<string, int>.KeyCollection ks = dict.Keys;
  45.     SortedDictionary<string, int>.ValueCollection vs = dict.Values;
  46.  
  47.     string s1, s2, s3;
  48.     s1 = s2 = s3 = "";
  49.  
  50.     foreach (KeyValuePair<string, int> k in dict)
  51.     {
  52.         s1 += string.Format("{0}-{1}; ", k.Key, k.Value); //K1-111; K2-222; K3-333;
  53.     }
  54.  
  55.     foreach (string s in ks) { s2 += s + "; "; }          //K1; K2; K3;
  56.     foreach (int n in vs) { s3 += n.ToString() + "; "; }  //111; 222; 333;
  57.  
  58.     TextBox1.Text = s1 + "\n" + s2 + "\n" + s3;
  59. }
  60.  
  61. SortedList<>:
  62. protected void Button1_Click(object sender, EventArgs e)
  63. {
  64.     SortedList<string, int> dict = new SortedList<string, int>();
  65.     dict.Add("K3", 333);
  66.     dict["K1"] = 111;
  67.     dict.Add("K2", 222);
  68.  
  69.     string s1, s2, s3;
  70.     s1 = s2 = s3 = "";
  71.  
  72.     foreach (KeyValuePair<string, int> k in dict)
  73.     {
  74.         s1 += string.Format("{0}-{1}; ", k.Key, k.Value); //K1-111; K2-222; K3-333;
  75.     }
  76.  
  77.     s2 = dict.Keys[0];              //K1
  78.     s3 = dict.Values[0].ToString(); //111
  79.  
  80.     TextBox1.Text = s1 + "\n" + s2 + "\n" + s3;
  81. }
  82.  
  83. HashSet<>、SortedSet<>:
  84. protected void Button1_Click(object sender, EventArgs e)
  85. {
  86.     HashSet<string> hs = new HashSet<string>();
  87.     hs.Add("ccc");
  88.     hs.Add("bbb");
  89.     hs.Add("aaa");
  90.  
  91.     SortedSet<string> ss = new SortedSet<string>();
  92.     ss.Add("ccc");
  93.     ss.Add("bbb");
  94.     ss.Add("aaa");
  95.  
  96.     string s1 = "", s2 = "";
  97.  
  98.     foreach (string s in hs) { s1 += s + " "; } //ccc bbb aaa
  99.     foreach (string s in ss) { s2 += s + " "; } //aaa bbb ccc
  100.  
  101.     TextBox1.Text = s1 + "\n" + s2;
  102. }
  103.  
  104. List<>:
  105. protected void Button1_Click(object sender, EventArgs e)
  106. {
  107.     List<int> list = new List<int>();
  108.     list.Add(11);
  109.     list.Add(22);
  110.     list.Insert(0, 33);
  111.  
  112.     string s1, s2 = "", s3, s4 = "";
  113.  
  114.     s1 = list[0].ToString(); //33
  115.     for (int i = 0; i < list.Count; i++) { s2 += list[i].ToString() + " "; } //33 11 22
  116.  
  117.     list.Sort();
  118.  
  119.     s3 = list[0].ToString(); //11
  120.     foreach (int n in list) { s4 += n.ToString() + " "; } //11 22 33
  121.  
  122.     TextBox1.Text = s1 + "\n" + s2 + "\n" + s3 + "\n" + s4;
  123. }
  124.  
  125. LinkedList<>、LinkedListNode<>:
  126. protected void Button1_Click(object sender, EventArgs e)
  127. {
  128.     LinkedList<string> list = new LinkedList<string>();
  129.     list.AddFirst("aaa");
  130.     list.AddLast("bbb");
  131.     list.AddFirst("ccc");
  132.     list.AddAfter(list.First, "ddd");
  133.     list.AddBefore(list.Last, "eee");
  134.  
  135.     string s1 = "", s2 = "", s3 = "", s4 = "", s5 = "";
  136.  
  137.     foreach (string s in list) { s1 += s + " "; } //ccc ddd aaa eee bbb
  138.  
  139.     LinkedListNode<string> node = list.First;
  140.     s2 = node.Value.ToString();         //ccc
  141.     node = node.Next;
  142.     s3 = node.Value.ToString();         //ddd
  143.     node = list.Last.Previous.Previous;
  144.     s4 = node.Value.ToString();         //aaa
  145.  
  146.     list.Remove("eee");
  147.     list.RemoveFirst();
  148.     list.RemoveLast();
  149.  
  150.     node = list.First;
  151.     while (node != null)
  152.     {
  153.         s5 += node.Value.ToString() + " "; //ddd aaa
  154.         node = node.Next;
  155.     }
  156.     TextBox1.Text = s1 + "\n" + s2 + "\n" + s3 + "\n" + s4 + "\n" + s5;
  157. }
  158. //csharp/2520

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