回头看看数据集合

C#中提供我们这些集合ArryList,hashtable,list,Dictionary<string,values>:这些集合为我们提供了许多不同场合中的方便。


ArrayList的用法：
 ArrayList class1 = new ArrayList(2);
            Student s1 = new Student("zs", 23, Genders.男);
            Student s2 = new Student("ls", 22, Genders.女);
            Student s3 = new Student("ww", 20, Genders.女);
            Student s4 = new Student("ml", 23, Genders.女);
            //往列表集合添加数据（添加项）;
            //object obj1 = (object)s1;
            Console.WriteLine(class1.Count);
            Console.WriteLine(class1.Capacity);
           
            class1.Add(s1);
            //集合的实际元素数
            Console.WriteLine(class1.Count);
            //集合预分配大小
            Console.WriteLine(class1.Capacity);
            class1.Add(s2);
            Console.WriteLine(class1.Count);
            Console.WriteLine(class1.Capacity);
            class1.Add(s3);
            Console.WriteLine(class1.Count);
            Console.WriteLine(class1.Capacity);
            //迭代遍历
            foreach (object obj in class1)
            {
                Student s = (Student)obj;
                s.SayHi();
            }


hashtable的用法：
Hashtable ht = new Hashtable();
            Student s1 = new Student("zs", 23, Genders.男);
            Student s2 = new Student("ls", 22, Genders.女);
            Student s3 = new Student("ww", 20, Genders.女);
            //添加元素
            ht.Add(s1.Name, s1);
            ht.Add(s2.Name, s2);
            ht.Add(s3.Name, s3);
            //获取单个成员
            //Student ss = (Student)ht["ls"];
           // ss.SayHi();
            //遍历操作
            foreach (object obj in ht.Values)
            {
                Student s = (Student)obj;
                s.SayHi();
            }
            //删除操作
            ht.Remove("zs");
            Console.WriteLine("删除以后");
            foreach (object obj in ht.Keys)
            {
                Student s = (Student)ht[obj];
                s.SayHi();
            }


list的用法：
 class LoadDataPerson
    {
        public void LoadData(List<Student> list)
        {
            Student s1 = new Student("zs", 24, Genders.男);
            list.Add(s1);
           
         

        }
    }
    class ReadDataPerson
    {
        public void ReadData(List<Student> list)
        {
            foreach (Student obj in list)
            {
              //  ((Student)obj).SayHi();
                obj.SayHi();
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
           // ArrayList list = new ArrayList();
            List<Student> list = new List<Student>();
            LoadDataPerson p1 = new LoadDataPerson();
            p1.LoadData(list);
            ReadDataPerson p2 = new ReadDataPerson();
            p2.ReadData(list);
            //添加数据
            //list.Add(数据)
            list[0].SayHi();
           
        }
    }


Dictionary<string,values>:
 List<Student> list = new List<Student>();
            Dictionary<string, Teacher> dic = new Dictionary<string, Teacher>();

            Student s1 = new Student("zs", 22, Genders.男);
            Student s2 = new Student("ww", 21, Genders.男);

            Teacher t = new Teacher("ls", 33);
            list.Add(s1);
            list.Add(s2);
            dic.Add(t.Name, t);
            //获取单个元素
            Student s = list[0];
            foreach (Student sss in list)
            {
                sss.SayHi();
            }
            foreach (KeyValuePair<string,Teacher> e in dic)
            {
                if (e.Key == "lsd")
                {
                    Console.Write(e.Value.Name);
                }
                else
                {
                    Console.WriteLine("没有找到");
                }
               
            }
以上是这几个集合的使用。方便比较，所以将这几个写在一起。代码易看。