有数据绑定、排序、查找功能的ListView（二）：

答案：using System;
using System.Data;
using System.Text;
using System.Globalization;
using System.Collections;
using System.Reflection;

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Design;

using System.Windows.Forms;
using System.Windows.Forms.Design;

using System.ComponentModel;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;

using System.Runtime.InteropServices;

namespace CommonFrame.OCX
{
 /// <summary>
 /// 为ListView增加数据绑定、查找和排序功能
 /// </summary>
 /// 

 #region 枚举
 public enum SortType
 {
  String,
  Number,
  Date
 }
 #endregion

 #region 继承实现ListView列表类
 public class ListViewEx : System.Windows.Forms.ListView
 {

  #region 列表项目所需的WIndows32 API定义

  [StructLayout(LayoutKind.Sequential)]
  private struct HDITEM 
  {
   public Int32     mask; 
   public Int32     cxy;  
   [MarshalAs(UnmanagedType.LPTStr)] 
   public String    pszText; 
   public IntPtr  hbm; 
   public Int32     cchTextMax; 
   public Int32     fmt; 
   public Int32     lParam; 
   public Int32     iImage;
   public Int32     iOrder;
  };

  [StructLayout(LayoutKind.Sequential) ] 
  public struct LVFINDINFO 
  { 
   public LVFI_FLAGS flags;
   public string psz;
   public IntPtr lParam;
   public Point pt;
   public VirtualKey vkDirection ;
  } 

  public enum LVFI_FLAGS
  {
   LVFI_PARAM     = 0x1,
   LVFI_PARTIAL   = 0x8,
   LVFI_STRING    = 0x2,
   LVFI_WRAP    = 0x20,
   LVFI_NEARESTXY = 0x40,
  }

  public enum VirtualKey 
  {
   VK_LEFT  = 0x25,
   VK_RIGHT = 0x27,
   VK_UP    = 0x26,
   VK_DOWN  = 0x28,
   VK_HOME  = 0x24,
   VK_END   = 0x23,
   VK_PRIOR = 0x21,
   VK_NEXT  = 0x22
  }

  [DllImport("user32")]
  static extern IntPtr SendMessage(IntPtr Handle, Int32 msg, IntPtr wParam, IntPtr lParam);
  [DllImport("user32", EntryPoint="SendMessage")]
  static extern IntPtr SendMessageH(IntPtr Handle, Int32 msg, IntPtr wParam, ref HDITEM lParam);
  [DllImport("user32.dll", EntryPoint="SendMessage", CharSet=CharSet.Auto)] 
  static extern int SendMessageL(System.IntPtr hWnd, Int32 msg, int wParam, ref LVFINDINFO lparam);

  const Int32 HDI_WIDTH      = 0x0001;
  const Int32 HDI_HEIGHT     = HDI_WIDTH;
  const Int32 HDI_TEXT       = 0x0002;
  const Int32 HDI_FORMAT     = 0x0004;
  const Int32 HDI_LPARAM     = 0x0008;
  const Int32 HDI_BITMAP     = 0x0010;
  const Int32 HDI_IMAGE      = 0x0020;
  const Int32 HDI_DI_SETITEM = 0x0040;
  const Int32 HDI_ORDER      = 0x0080;
  const Int32 HDI_FILTER     = 0x0100;  // 0x0500

  const Int32 HDF_LEFT            = 0x0000;
  const Int32 HDF_RIGHT           = 0x0001;
  const Int32 HDF_CENTER          = 0x0002;
  const Int32 HDF_JUSTIFYMASK     = 0x0003;
  const Int32 HDF_RTLREADING      = 0x0004;
  const Int32 HDF_OWNERDRAW       = 0x8000;
  const Int32 HDF_STRING          = 0x4000;
  const Int32 HDF_BITMAP          = 0x2000;
  const Int32 HDF_BITMAP_ON_RIGHT = 0x1000;
  const Int32 HDF_IMAGE           = 0x0800;
  const Int32 HDF_SORTUP          = 0x0400;  // 0x0501
  const Int32 HDF_SORTDOWN        = 0x0200;  // 0x0501

  const Int32 LVM_FIRST      = 0x1000;  // List 消息
  const Int32 LVM_FINDITEMA  = LVM_FIRST + 13;
  const Int32 LVM_FINDITEMW  = LVM_FIRST + 83;
  const Int32 LVM_GETHEADER  = LVM_FIRST + 31;

  const Int32 HDM_FIRST        = 0x1200;  // Header 消息
  const Int32 HDM_SETIMAGELIST = HDM_FIRST + 8;
  const Int32 HDM_GETIMAGELIST = HDM_FIRST + 9;
  const Int32 HDM_GETITEM      = HDM_FIRST + 11;
  const Int32 HDM_SETITEM      = HDM_FIRST + 12;

  #endregion

  private string          m_strDataFilter   = "";
  private int             m_intSortColumn   = -1;
  private string          m_strDataMember   = "";
  private CurrencyManager m_objDataManager  = null;
  private DataSet         m_objData         = null;
  private DataView        m_objView         = null;

  internal bool           m_blnModifiedItem = true; 

  private CommonFrame.OCX.ListViewItemsCollection        m_objItems   ; 
  private CommonFrame.OCX.ColumnHeaderMappingCollection  m_objMappings ; 
  
  public ListViewEx()
  {
   m_objItems    = new CommonFrame.OCX.ListViewItemsCollection(this);
   m_objMappings = new CommonFrame.OCX.ColumnHeaderMappingCollection();
  }

  #region 属性

  [
  CategoryAttribute("Data"),
  BrowsableAttribute(true),
  DescriptionAttribute("设置的数据成员"),
  DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible),
  DefaultValueAttribute("")
  ]
  public string DataMember
  {
   get
   {
    return m_strDataMember;
   }
   set
   {
    m_strDataMember = value;
    //this.SetDataMember();
   }
  }

  [
  CategoryAttribute("Data"),
  BrowsableAttribute(true),
  DescriptionAttribute("设置数据源"),
  DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible),
  DefaultValueAttribute(null)
  ]
  public DataSet DataSource
  {
   get
   {
    return m_objData;
   }
   set
   {
    m_objData = value;
    this.SetDataSource();
   }
  }

  [
  BrowsableAttribute(false),
  DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)
  ]
  public string DataFilter
  {
   get
   {
    return m_strDataFilter;
   }
   set
   {
    if (this.m_objData != null)
    {
     m_strDataFilter = value;
     this.SetDataFilter();
    }
    else
    {
     m_strDataFilter = "";
    }
   }
  }

  [
  CategoryAttribute("杂项"),
  BrowsableAttribute(true),
  DescriptionAttribute("列表项集合"),
  DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Content),
  DefaultValueAttribute(null)
  ]
  public CommonFrame.OCX.ListViewItemsCollection Items
  {
   get
   {
    return m_objItems;
   }
  }
                       
  [
  CategoryAttribute("杂项"),
  BrowsableAttribute(true),
  DescriptionAttribute("列表标头与数据成员映射集合"),
  DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Content),
  DefaultValueAttribute(null)
  ]
  public  CommonFrame.OCX.ColumnHeaderMappingCollection ColumnHeaderMappings
  {
   get
   {
    return m_objMappings;
   }
   set
   {
    m_objMappings = value;
   }
  }

  public bool MultiSelect
  {
   get
   {
    return base.MultiSelect;
   }
   set
   {
    base.MultiSelect = value;
    if ((this.DataSource != null) && (base.MultiSelect == true))
    {
     base.MultiSelect = false;
     throw new Exception("已经设置了数据源DataSource，不能多选");
    }
   }
  }

  #endregion

  #region 方法

  // 填充数据
  private void FillListViewItems()
  {
   ListViewItem item        = null;
   int          intRowCount = this.m_objDataManager.Count ;
   
   this.BeginUpdate();

   //允许修改列表项目
   this.m_blnModifiedItem = true;   
   //清除已经有的列表项目
   if(this.Items.Count>0)
   {
    this.Items.Clear();
   }

   for(int i=0;i<intRowCount;i++)
   {  
    item = new ListViewItem(m_objView[i][this.m_objMappings[0].MappingField].ToString());
    for(int j=1;j<this.m_objMap

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