using System; namespace 自定义数据源 {         /**/ ///   <summary>

        ///  自定义数据源

        ///   </summary>         public  class cusdatasource : System.Collections.CollectionBase         {                         public cusdatasource()                         {                                 for( int i = 0;i < 10;i++)                                 {                                         base.InnerList.Add( new Element(i, string.Format("a[{0}]",i)));                                }                        }        }         public  class Element         {                 private  string name;                 public  string ValueName                 {                         get { return name;}                }                 private  int valu;                 public  int Value                 {                         get { return valu;}                }                 public Element( int val, string nam)                 {                        name = nam;                        valu = val;                }        } }

using System; namespace personaltest {         /**/ ///   <summary>

        ///  source 的摘要说明。

        ///   </summary>         public  class source:System.ComponentModel.IListSource         {                 private data d= new data();                 public source()                 {                         for( int i=0;i<10;i++)                         {                                 d.Add( new dataitem(i, string.Format("this is {0}",i)));                        }                }                 IListSource 成员 #region IListSource 成员                 public System.Collections.IList GetList()                 {                         //  TODO:  添加 source.GetList 实现

                        return d;                }                 public  bool ContainsListCollection                 {                         get                         {                                 //  TODO:  添加 source.ContainsListCollection getter 实现

                                return  false;                        }                }                 #endregion        }         public  class data:System.Collections.IList,System.Collections.IEnumerator         {                 protected System.Collections.ArrayList _dataitems;                 protected  int _ptr=0;                 public data()                 {                        _dataitems= new System.Collections.ArrayList();                }                 IList 成员 #region IList 成员                 public  bool IsReadOnly                 {                         get                         {                                 //  TODO:  添加 data.IsReadOnly getter 实现

                                return  false;                        }                }                 public  object  this[ int index]                 {                         get                         {                                 return _dataitems[index];                        }                         set                         {                                _dataitems[index]=value;                        }                }                 public  void RemoveAt( int index)                 {                         if(index>=0 && index<_dataitems.Count)                                _dataitems.RemoveAt(index);                }                 public  void Insert( int index,  object value)                 {                         if(index>=0 && index<_dataitems.Count)                         {                                _dataitems.Insert(index,value);                        }                }                 public  void Remove( object value)                 {                        _dataitems.Remove(value);                }                 public  bool Contains( object value)                 {                         return _dataitems.Contains(value);                }                 public  void Clear()                 {                        _dataitems.Clear();                }                 public  int IndexOf( object value)                 {                         return _dataitems.IndexOf(value);                }                 public  int Add( object value)                 {                         return _dataitems.Add(value);                }                 public  bool IsFixedSize                 {                         get                         {                                 return _dataitems.IsFixedSize;                        }                }                 #endregion                 ICollection 成员 #region ICollection 成员                 public  bool IsSynchronized                 {                         get                         {                                 return  false;                        }                }                 public  int Count                 {                         get                         {                               return _dataitems.Count;                        }                }                 public  void CopyTo(Array array,  int index)                 {                }                 public  object SyncRoot                 {                         get                         {                                 return  null;                        }                }                 #endregion                 IEnumerable 成员 #region IEnumerable 成员                 public System.Collections.IEnumerator GetEnumerator()                 {                         return  this;                }                 #endregion                 IEnumerator 成员 #region IEnumerator 成员                 public  void Reset()                 {                        _ptr=0;                }                 public  object Current                 {                         get                         {                                 return  this[_ptr++];                        }                }                 public  bool MoveNext()                 {                         if(_ptr< this.Count)                         {                                 return  true;                        }                         else                         {                                 this.Reset();                                 return  false;                        }                }                 #endregion        }         public  class dataitem         {                 private  string name;                 public  string ValueName                 {                         get { return name;}                }                 private  int valu;                 public  int Value                 {                         get { return valu;}                }                  public dataitem( int val, string nam)                 {                        name = nam;                        valu = val;                }        } }