几个常用的集合类的使用

1.HashTable

 

        private static void HashTableSample()
        {
            // Creates and initializes a new Hashtable.
            Hashtable table = new Hashtable();
            table.Add("1","frist");
            table.Add("2","second");
            table.Add("3","third");
            // Displays the properties and values of the Hashtable.
            Console.WriteLine( "table" );
            Console.WriteLine( "  Count:    {0}", table.Count );
            Console.WriteLine( "  Keys and Values:" );
            //how to print out its keys and values
            foreach(DictionaryEntry d in table)
            {
                Console.WriteLine ("{0}\t{1}", d.Key, d.Value);
            }
            Console.ReadLine();
        }

2.ArrayList

 

private static void ArrayListSample()
        {
            // Creates and initializes a new ArrayList.
            ArrayList myAL = new ArrayList();
            myAL.Add("Hello");
            myAL.Add("World");
            myAL.Add("!");

            // Displays the properties and values of the ArrayList.
            Console.WriteLine( "myAL" );
            Console.WriteLine( "\tCount:    {0}", myAL.Count );
            Console.WriteLine( "\tCapacity: {0}", myAL.Capacity );
            Console.Write( "\tValues:" );
            foreach(object o in myAL)
            {
                Console.WriteLine(o.ToString());
            }
            Console.ReadLine();

        }

3.Queue

 

private static void QueueSmaple()
        {
            // Creates and initializes a new Queue.
            Queue myQ = new Queue();
            myQ.Enqueue("Hello");
            myQ.Enqueue("World");
            myQ.Enqueue("!");

            // Displays the properties and values of the Queue.
            Console.WriteLine( "myQ" );
            Console.WriteLine( "\tCount:    {0}", myQ.Count );
            Console.Write( "\tValues:" );
            System.Collections.IEnumerator myEnumerator = myQ.GetEnumerator();
            while ( myEnumerator.MoveNext() )
                Console.Write( "\t{0}", myEnumerator.Current );
            Console.WriteLine();
            Console.ReadLine();
        }

4.自定义集合类:

 

    public class Employee
    {
        private int _id;
        private string _name;
        public Employee(int id,string name)
        {
            _id = id;
            _name = name;
        }
        public int id
        {
            get
            {
                return _id;
            }
            set
            {
                _id = value;
            }
        }
        public string name
        {
            get
            {
                return _name;
            }
            set
            {
                _name = value;
            }
        }
    }
    public class EmployeeCollection :    ICollection
    {
        private int count;
        ArrayList mylist = new ArrayList();
        #region 实现接口ICollection
        public virtual int Count
        {
            get
            {
                return count;
            }
        }
        public virtual bool IsSynchronized 
        {
            get
            {
                return false;
            }
        }
        public virtual Object SyncRoot 
        {
            get
            {
                return this;
            }
        }
        public virtual void CopyTo(Array array,int index)
        {
            //do nothing
        }
        public virtual IEnumerator GetEnumerator()
        {
            return null;
        }
        #endregion
        public virtual Employee this[int i]
        {
            get
            {
                return (Employee)this.mylist[i]    ;
            }
        }
        public void AddEmployee(int id,string name)
        {
            Employee emp = new Employee(id,name);
            mylist.Add(emp);
            count = mylist.Count;
        }
        public Employee GetEmployee(int id)
        {
            foreach(Employee e in mylist)
            {
                if(id == e.id)
                {
                    return e;
                }
                else
                {
                    return null;
                }
            }
            return null;
        }
    }

遍历自定义集合类:

 

            EmployeeCollection eCollection = new EmployeeCollection();
            eCollection.AddEmployee(1,"Engine");
            eCollection.AddEmployee(2,"Water");
            eCollection.AddEmployee(3,"Arvin");
            eCollection.AddEmployee(4,"Vikki");
            eCollection.AddEmployee(5,"Gray");
            eCollection.AddEmployee(6,"Tom");
            for(int i = 0; i <eCollection.Count;i++)
            {
                Console.WriteLine(eCollection[i].name);
            }
            Console.ReadLine();