C#基础：自定义字典的使用

字典，通过key---value键值对存储，访问数据的，可以通过继承DictionaryBase类来创建自定义字典，DictionaryBase类实现了IEnumerable和ICollection接口。

1.  public abstract class Animal//父类，抽象类
2.     {
3.         private string name;
4.         public string Name
5.         {
6.             set { this.name = value; }
7.             get { return this.name; }
8.         }
9.         public Animal() {
10.             this.name = "the animal no name";
11.         }
12.         public Animal(string name) {
13.             this.name = name;
14.         }
15.         public void Feed() => Console.WriteLine($"{name} has been fed");
16.     }
17. //子类继承自Animal
18.  class Chicken:Animal
19.     {
20.         public Chicken(string name) : base(name) { }
21.         public void LayEgg() => Console.WriteLine($"{Name} has been Lay an Egg");
22.     } 
23. //子类继承自Animal
24. class Cow:Animal
25.     {
26.         public Cow(string name) : base(name) { }
27.         public void Milk() => Console.WriteLine($"{Name}has been Milked");
28.     } 

 //IDictionary通过继承DictionaryBase实现自定义字典

1. public class Animals : DictionaryBase
2.     {     
3.         public Animals() { }
4.         public void Add(string index, Animal ani)//Add（）方法通过添加key----value键值对添加
5.         {
6.             Dictionary.Add(index, ani);
7.         }
8.         public void Remove(string index)//Remove()方法通过索引删除
9.         {
10.             Dictionary.Remove(index);
11.         }
12.         public Animal this[int i]//索引器和this一起使用，通过索引器可以以Animal[0]的方式访问
13.         {
14.             get { return (Animal)Dictionary[i]; }
15.             set { Dictionary[i] = value; }
16.         }
17.     }

//Main()  方法

1. staticvoidMain(string[] args){
2.             Animal animals = new Cow("ss");
3.             Animals aniDictionary = new Animals();//自定义字典对象
4.             aniDictionary.Add("001", animals);//添加key ---value对象
5.             aniDictionary.Add("002", new Cow("lily"));
6.             aniDictionary.Add("003", new Chicken("dark"));
7.             foreach (DictionaryEntry ani in aniDictionary)//foreach循环输出
8.             {//通过ani.key和ani.value来访问
9.                 Console.WriteLine(ani.Key.ToString() + ":::" + ((Animal)ani.Value).Name.ToString());
10.             }
11.             Console.WriteLine();
12.             aniDictionary.Remove("001");//删除，通过索引删除
13.             foreach (DictionaryEntry it in aniDictionary)
14.             {
15.                 Console.WriteLine(it.Key.ToString() + "|||" + ((Animal)it.Value).Name.ToString());
16.             }
17.             Console.WriteLine();
18. }
19.