define an objectCollection

using System;

using System.Collections ;

namespace LiveChain.CSW.CommonData
{

public class ChildData

{

//only property

 }

public class ChildDataCollection : System.Collections.CollectionBase,System.ComponentModel.IListSource
    {
        //        string fullName = "LiveChain.CSW.CommonData.ChildData";
        public ChildData this[ int index ] 
        {
            get 
            {
                return( (ChildData) List[index] );
            }
            set 
            {
                List[index] = value;
            }
        }

        public ChildData this[string childId]
        {
            get
            {
                foreach (ChildData child in List)
                {
                    if (child.ChildId == childId)
                        return child ;
                }
                // if can't find the child ,return null ;
                return new ChildData() ;
            }
        }

        public int Add( ChildData value ) 
        {
            return( List.Add( value ) );
        }

        public int IndexOf( ChildData value ) 
        {
            return( List.IndexOf( value ) );
        }

        public void Insert( int index, ChildData value ) 
        {
            List.Insert( index, value );
        }

        public void Remove( ChildData value ) 
        {
            List.Remove( value );
        }

        public bool Contains( ChildData value ) 
        {
            // If value is not of type ChildData, this will return false.
            return( List.Contains( value ) );
        }

        #region IListSource 成员

        public IList GetList()
        {
            // TODO:  添加 StudentDataCollection.GetList 实现
            return this.List;
        }

        public bool ContainsListCollection
        {
            get
            {
                // TODO:  添加 StudentDataCollection.ContainsListCollection getter 实现
                return false;
            }
        }

        #endregion
    }