大多数集合都在System.Collections,System.Collections.Generic两个命名空间。其中System.Collections.Generic专门用于泛型集合。
针对特定类型的集合类型位于System.Collections.Specialized;命名空间;
线程安全的集合类位于System.Collections.Concurrent;命名空间。
下面是集合和列表实现的接口如下:
一、列表
[Serializable] [DebuggerTypeProxy(typeof(Mscorlib_CollectionDebugView<>))] [DebuggerDisplay("Count = {Count}")] public class List从这个可以看出,泛型集合List<T>实现了这么多接口,具体接口的信息可以通过工具查看。: IList , ICollection , IEnumerable , IList, ICollection, IEnumerable
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { List二、队列list = new List (); list.Add("张三"); list.Add("李四"); list.Add("王五"); list.Add("田六"); list.Add("赵七"); for (int i = 0; i < list.Count; i++) { Console.WriteLine("for循环:" + i.ToString() + "=" + list[i]); } list.RemoveAt(0); foreach (String item in list) { Console.WriteLine("foreach迭代:" + item); } list.AddRange(new String[] { "Hello1", "Hello2", "Hello3" }); list.ForEach(Print); Console.Read(); } private static void Print(String item) { Console.WriteLine("ForEach:" + item); } }}
队列先进先出,一头进一头出,用Queue<T>实现
[Serializable] [DebuggerTypeProxy(typeof(System_QueueDebugView<>))] [ComVisible(false)] [DebuggerDisplay("Count = {Count}")] public class Queue: IEnumerable , ICollection, IEnumerable
可以看出队列实现了集合的接口,迭代的接口
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { Queue三、栈queue = new Queue (); //进队 queue.Enqueue("张三"); queue.Enqueue("李四"); queue.Enqueue("王五"); queue.Enqueue("田六"); queue.Enqueue("赵七"); foreach (String item in queue) { Console.WriteLine("foreach迭代:" + item); } //出队 while (queue.Count > 0) { Console.WriteLine("出队:" + queue.Dequeue()); } Console.Read(); } }}
栈:从同一边先进后出,用Stack<T>实现
[DebuggerDisplay("Count = {Count}")] [DebuggerTypeProxy(typeof(System_StackDebugView<>))] [ComVisible(false)] public class Stack栈也是实现了集合接口与迭代接口的: IEnumerable , ICollection, IEnumerable
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { Stack四、链表stack = new Stack (); //进栈 stack.Push("张三"); stack.Push("李四"); stack.Push("王五"); stack.Push("田六"); stack.Push("赵七"); foreach (String item in stack) { Console.WriteLine("foreach迭代:" + item); } //出栈 while (stack.Count > 0) { Console.WriteLine("出栈:" + stack.Pop()); } Console.Read(); } }}
LinkedList是一个双向链表,链表有个有点,就是在链表中间插入、删除元素很快,但是查找中间与末尾的元素很慢,需要一个节点一个节点的去找。
[Serializable] [DebuggerTypeProxy(typeof(System_CollectionDebugView<>))] [DebuggerDisplay("Count = {Count}")] [ComVisible(false)] public class LinkedList: ICollection , IEnumerable , ICollection, IEnumerable, ISerializable, IDeserializationCallback
由此可见链表也是有集合的特性的,可以迭代,同时还有链表的特性
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { LinkedList五、有序列表lList = new LinkedList (); LinkedListNode node = new LinkedListNode ("root"); lList.AddFirst(node); node = lList.AddAfter(node, "张三"); node = lList.AddAfter(node, "李四"); node = lList.AddAfter(node, "王五"); node = lList.AddAfter(node, "田六"); node = lList.AddAfter(node, "赵七"); foreach (String item in lList) { Console.WriteLine("foreach迭代:" + item); } node = lList.First; Console.WriteLine("第一个元素:" + node.Value); node = lList.Last; Console.WriteLine("最后一个元素:" + node.Value); Console.Read(); } }}
SortedList采用键-值对存储,键不能重复,并且会根据key进行排序
[Serializable] [DebuggerTypeProxy(typeof(System_DictionaryDebugView<,>))] [DebuggerDisplay("Count = {Count}")] [ComVisible(false)] public class SortedList: IDictionary , ICollection >, IEnumerable >, IDictionary, ICollection, IEnumerable
可以看出SortedList不仅具有字典的特性,还有集合,迭代的功能
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { //Key必须唯一,如果不唯一可以考虑Lookup六、字典SortedList sList = new SortedList (); sList.Add(100, "张三"); sList.Add(21, "李四"); sList.Add(13, "王五"); sList.Add(44, "田六"); sList.Add(35, "赵七"); foreach (KeyValuePair item in sList) { Console.WriteLine("key=" + item.Key.ToString() + ";value=" + item.Value); } Console.Read(); } }}
字典是很复杂的数据结构,允许通过key来查找值,字典可以自由添加、删除元素,没有集合由于移动元素导致的开销。
[Serializable] [DebuggerTypeProxy(typeof(Mscorlib_DictionaryDebugView<,>))] [DebuggerDisplay("Count = {Count}")] [ComVisible(false)] public class Dictionary: IDictionary , ICollection >, IEnumerable >, IDictionary, ICollection, IEnumerable, ISerializable, IDeserializationCallback
可以看出字典也具有集合的特性,可以迭代
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { //Key必须唯一 Dictionary说到字典,顺便谈一下有序字典,与有序列表对应;SortedDictionary,SortedList,SortedSetdict = new Dictionary (); dict.Add(11, "张三"); dict.Add(1, "李四"); dict.Add(2, "王五"); dict.Add(16, "田六"); dict.Add(12, "赵七"); foreach (KeyValuePair item in dict) { Console.WriteLine("key=" + item.Key.ToString() + ";value=" + item.Value); } Console.Read(); } }}
会根据Key进行排序
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { //Key必须唯一 SortedDictionarydict = new SortedDictionary (); dict.Add(11, "张三"); dict.Add(1, "李四"); dict.Add(2, "王五"); dict.Add(16, "田六"); dict.Add(12, "赵七"); foreach (KeyValuePair item in dict) { Console.WriteLine("key=" + item.Key.ToString() + ";value=" + item.Value); } Console.Read(); } }}
七、集
集(Set):包含不重复元素,常用HashSet,SortedSet
[Serializable] [DebuggerDisplay("Count = {Count}")] [DebuggerTypeProxy(typeof(HashSetDebugView<>))] public class HashSet: ISerializable, IDeserializationCallback, ISet , ICollection , IEnumerable , IEnumerable
[Serializable] [DebuggerTypeProxy(typeof(SortedSetDebugView<>))] [DebuggerDisplay("Count = {Count}")] public class SortedSet: ISet , ICollection , IEnumerable , ICollection, IEnumerable, ISerializable, IDeserializationCallback
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { HashSethSet = new HashSet (); hSet.Add("张三"); hSet.Add("李四"); hSet.Add("王五"); hSet.Add("田六"); hSet.Add("赵七"); foreach (String item in hSet) { Console.WriteLine("foreach迭代:" + item); } Console.Read(); } }}
using System;using System.Collections.Generic;namespace ConsoleApplication1{ public class Program { static void Main(string[] args) { SortedSet性能比较:hSet = new SortedSet (); hSet.Add("张三"); hSet.Add("李四"); hSet.Add("王五"); hSet.Add("田六"); hSet.Add("赵七"); foreach (String item in hSet) { Console.WriteLine("foreach迭代:" + item); } Console.Read(); } }}
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