分页控件

简介: using System; using System.IO; using System.Drawing; using System.Data; using System.Data.OracleClient; using System.

using System;
using System.IO;
using System.Drawing;
using System.Data;
using System.Data.OracleClient;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Configuration;
using System.Text;

namespace IMS.ServerControls
{

 /// <summary>
 /// 分页控件
 /// </summary>
 public class PageControl :WebControl, INamingContainer
 {
  #region 私有成员
  private const string s_connPrefix = "User ID=ims;Data Source=dev;Password=flower";
  private DataTable _dataSource;
  private Control _controlToPaginate;
              
  private string CurrentPageText = "页数:&nbsp;{0} /&nbsp;{1}";
  private string NoPageSelectedText = "没有页被选择";


  private string QueryPageCommandText = "SELECT * FROM (SELECT T0.*,ROWNUM ROWNO FROM ({0} ORDER BY {3} {4}) T0) "
   + " WHERE ROWNO BETWEEN {1} AND {2} ORDER BY {3} {4}";

  private string QueryPageCommandTextNoOrder = "SELECT * FROM (SELECT T0.*,ROWNUM ROWNO FROM ({0}) T0) "
   + " WHERE ROWNO BETWEEN {1} AND {2}";

  private string QueryCountCommandText = "SELECT COUNT(*) FROM ({0})";
  #endregion

  #region 构造函数
  public PageControl()
  {
   _dataSource = null;
   _controlToPaginate = null;
   Font.Name = "宋体";
   Font.Size = FontUnit.Point(8);
   BackColor = Color.Gainsboro;
   ForeColor = Color.Black;
   BorderStyle = BorderStyle.Outset;
   BorderWidth = Unit.Parse("1px");           
   PagerStyle = PagerStyle.NextPrev;
   PagerHorizonalAlign = HorizontalAlign.Left;
   SortingMode = SortingMode.ASC;
   CurrentPageIndex = 0;
   SelectCommand = "";
   ItemsPerPage = 10;
   TotalPages = -1;
   RecordCount = 0;
   IsPostBack = false;
   IsSorted = false;
  }
  #endregion

  #region 公共成员接口
      
  public delegate void PageChangedEventHandler(object sender, PageChangedEventArgs e);
  public event PageChangedEventHandler PageIndexChanged;

  protected virtual void OnPageIndexChanged(PageChangedEventArgs e)
  {
   if (PageIndexChanged != null)
   {
    PageIndexChanged(this, e);
   }
  }

  [Description("导航控件对齐方式")]
  public HorizontalAlign PagerHorizonalAlign
  {
   get
   {
    return (HorizontalAlign)ViewState["HorizonalAlign"];
   }
   set
   {
    ViewState["HorizonalAlign"] = value;
   }
  }

  [Description("获取和设置分页控件的导航样式")]
  public PagerStyle PagerStyle
  {
   get
   {
    return (PagerStyle)ViewState["PagerStyle"];
   }
   set
   {
    ViewState["PagerStyle"] = value;
   }
  }

  [Description("获取和设置默认的排序方式")]
  public SortingMode SortingMode
  {
   get
   {
    return (SortingMode)ViewState["SortingMode"];
   }
   set
   {
    ViewState["SortingMode"] = value;
   }
  }

  [Description("获取和设置需要分页控件的名称")]
  public string ControlToPaginate
  {
   get
   {
    return Convert.ToString(ViewState["ControlToPaginate"]);
   }
   set
   {
    ViewState["ControlToPaginate"] = value;
   }
  }

  [Description("获取和设置每页显示的记录数")]
  public int ItemsPerPage
  {
   get
   {
    return Convert.ToInt32(ViewState["ItemsPerPage"]);
   }
   set
   {
    ViewState["ItemsPerPage"] = value;
   }
  }

  [Description("获取和设置当前页数")]
  public int CurrentPageIndex
  {
   get
   {
    return Convert.ToInt32(ViewState["CurrentPageIndex"]);
   }
   set
   {
    ViewState["CurrentPageIndex"] = value;
   }
  }

  [Description("获取和设置记录数")]
  public int RecordCount
  {
   get
   {
    return Convert.ToInt32(ViewState["RecordCount"]);
   }
   set
   {
    ViewState["RecordCount"] = value;
   }
  }

  [Browsable(false)]
  private bool IsSorted
  {
   get
   {
    return Convert.ToBoolean(ViewState["SqlPager_IsSorted"]);
   }
   set
   {
    ViewState["SqlPager_IsSorted"] = value;
   }
  }

  [Browsable(false)]
  private bool IsPostBack
  {
   get
   {
    return Convert.ToBoolean(ViewState["SqlPager_IsPostBack"]);
   }
   set
   {
    ViewState["SqlPager_IsPostBack"] = value;
   }
  }
       
  [Browsable(false)]
  private string ConnectionString
  {
   get
   {
    return ConfigurationSettings.AppSettings["ConnectionString"].ToString();
   }
  }

  [Description("获取和设置查询的SQL语句")]
  public string SelectCommand
  {
   get
   {
    return Convert.ToString(ViewState["SelectCommand"]);
   }
   set
   {
    ViewState["SelectCommand"] = value;
   }
  }

  [Description("获取和设置排序字段")]
  public string SortField
  {
   get
   {
    return Convert.ToString(ViewState["SortKeyField"]);
   }
   set
   {
    ViewState["SortKeyField"] = value;
   }
  }

  [Browsable(false)]
  public int PageCount
  {
   get
   {
    return TotalPages;
   }
  }

  protected int TotalPages
  {
   get
   {
    return Convert.ToInt32(ViewState["TotalPages"]);
   }
   set
   {
    ViewState["TotalPages"] = value;
   }
  }

  public override void DataBind()
  {
   IsPostBack = false;
   CurrentPageIndex = 0;
   BindDataControl();
   IsPostBack = true;
  }

  public void ReDataBind()
  {
   IsPostBack = false;           
   BindDataControl();
   IsPostBack = true;
  }

  private void BindDataControl()
  {
   base.DataBind();
   ChildControlsCreated = false;
   if (ControlToPaginate == "")
   {
    return;
   }
   _controlToPaginate = this.Page.FindControl(ControlToPaginate);

   //_controlToPaginate = Page.FindControl(ControlToPaginate);
   if (_controlToPaginate == null)
   {
    return;
   }

   if (!(_controlToPaginate is DataGrid || _controlToPaginate is BaseDataList || _controlToPaginate is ListControl))
   {
    return;
   }

   if (ConnectionString == "" || SelectCommand == "")
   {
    return;
   }
         
   FetchPageData();
   DataGrid compositeDataBoundControl = null;
   BaseDataList baseDataListControl = null;
   ListControl listControl = null;
   if (_controlToPaginate is DataGrid)
   {
    compositeDataBoundControl = (DataGrid)_controlToPaginate;
    compositeDataBoundControl.DataSource = _dataSource;
    compositeDataBoundControl.DataBind();
    return;
   }
   if (_controlToPaginate is BaseDataList)
   {
    baseDataListControl = (BaseDataList)_controlToPaginate;
    baseDataListControl.DataSource = _dataSource;
    baseDataListControl.DataBind();
    return;
   }
   if (_controlToPaginate is ListControl)
   {
    listControl = (ListControl)_controlToPaginate;
    listControl.Items.Clear();
    listControl.DataSource = _dataSource;
    listControl.DataBind();
    return;
   }
  }      

  protected override void Render(HtmlTextWriter writer)
  {
   if (Site != null && Site.DesignMode)
   {
    CreateChildControls();
   }
   base.Render(writer);
  }

  protected override void CreateChildControls()
  {
   Controls.Clear();           
   BuildControlHierarchy();
   ClearChildViewState();
  }       

  public void Sort(string sortExpress)
  {
   if (string.Equals(null,sortExpress))
   {
    return;
   }
   if (sortExpress.ToLower() == SortField.ToLower())
   {
    if (SortingMode == SortingMode.ASC)
    {
     SortingMode = SortingMode.DESC;
    }
    else
    {
     SortingMode = SortingMode.ASC;
    }
   }
   else
   {
    SortingMode = SortingMode.ASC;
   }
   CurrentPageIndex = 0;
   SortField = sortExpress;
   SortHandle();
   BindDataControl();
   
  }

  private void SortHandle()
  {
   Control pagerList = Page.FindControl(ControlToPaginate);
   if (pagerList is DataGrid)
   {
    DataGrid dgd = pagerList as DataGrid;
    if (dgd == null)
    {
     return;
    }
     
   
    DataGridColumnCollection columns = dgd.Columns;
    foreach(DataGridColumn column in columns)
    {
     if(column.SortExpression != null && column.SortExpression != "")
     {
      string headStr = column.HeaderText.Trim();      
        
      headStr = headStr.Replace("▼","");
      headStr = headStr.Replace("▲","");
       
      if(column.SortExpression.ToLower() == SortField.ToLower())
      {
       if(SortingMode == SortingMode.ASC)
       {
        headStr += "▲";
       }
       if(SortingMode == SortingMode.DESC)
       {
        headStr += "▼";
       }        
      }
      column.HeaderText = headStr;
     }
    }    
   }
  }  
  
  #endregion

  #region 私有方法      
  private void BuildControlHierarchy()
  {
   Table t = new Table();
   t.Font.Name = Font.Name;
   t.Font.Size = Font.Size;
   t.BorderStyle = BorderStyle;
   t.BorderWidth = BorderWidth;
   t.BorderColor = BorderColor;
   t.Width = Width;
   t.Height = Height;
   t.BackColor = BackColor;
   t.ForeColor = ForeColor;

   TableRow row = new TableRow();
   t.Rows.Add(row);

   TableCell cellNavBar = new TableCell();
   cellNavBar.HorizontalAlign = PagerHorizonalAlign;
   BuildCurrentPage(cellNavBar);
   cellNavBar.Controls.Add(new LiteralControl("&nbsp;&nbsp;&nbsp;&nbsp;"));
   if (PagerStyle == PagerStyle.NextPrev)
   {
    BuildNextPrevUI(cellNavBar);
   }
   else if (PagerStyle == PagerStyle.NumericPages)
   {
    BuildNumericPagesUI(cellNavBar);
   }
   else
   {
    BuildTextPagesUI(cellNavBar);
   }
   cellNavBar.Controls.Add(new LiteralControl("&nbsp;&nbsp;&nbsp;&nbsp;"));
   BuildGoToPagesUI(cellNavBar);
   row.Cells.Add(cellNavBar);
   Controls.Add(t);
  }
  private void BuildNextPrevUI(TableCell cell)
  {
   bool isValidPage = (CurrentPageIndex >= 0 && CurrentPageIndex <= TotalPages - 1);
   bool canMoveBack = (CurrentPageIndex > 0);
   bool canMoveForward = (CurrentPageIndex < TotalPages - 1);

   LinkButton first = new LinkButton();
   first.CausesValidation = false;
   first.ID = "First";
   first.Click += new EventHandler(First_Click);
   first.Font.Name = "webdings";
   first.Font.Size = Font.Size;
   first.ForeColor = ForeColor;
   first.ToolTip = "首页";
   first.Text = "9";
   first.Enabled = isValidPage && canMoveBack;
   cell.Controls.Add(first);

   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

   LinkButton prev = new LinkButton();
   prev.CausesValidation = false;
   prev.ID = "Prev";
   prev.Click += new EventHandler(Prev_Click);
   prev.Font.Name = "webdings";
   prev.Font.Size = Font.Size;
   prev.ForeColor = ForeColor;
   prev.ToolTip = "上一页";
   prev.Text = "3";
   prev.Enabled = isValidPage && canMoveBack;
   cell.Controls.Add(prev);

   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));           

   LinkButton next = new LinkButton();
   next.CausesValidation = false;
   next.ID = "Next";
   next.Click += new EventHandler(Next_Click);
   next.Font.Name = "webdings";
   next.Font.Size = Font.Size;
   next.ForeColor = ForeColor;
   next.ToolTip = "下一页";
   next.Text = "4";
   next.Enabled = isValidPage && canMoveForward;
   cell.Controls.Add(next);

   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

   LinkButton last = new LinkButton();
   last.CausesValidation = false;
   last.ID = "Last";
   last.Click += new EventHandler(Last_Click);
   last.Font.Name = "webdings";
   last.Font.Size = Font.Size;
   last.ForeColor = ForeColor;
   last.ToolTip = "尾页";
   last.Text = ":";
   last.Enabled = isValidPage && canMoveForward;
   cell.Controls.Add(last);
  }
  private void BuildNumericPagesUI(TableCell cell)
  {
   bool isValidPage = (CurrentPageIndex >= 0 && CurrentPageIndex <= TotalPages - 1);
   bool canMoveBack = (CurrentPageIndex > 0);
   bool canMoveForward = (CurrentPageIndex < TotalPages - 1);

   LinkButton first = new LinkButton();
   first.CausesValidation = false;
   first.ID = "First";
   first.Click += new EventHandler(First_Click);
   first.Font.Name = "webdings";
   first.Font.Size = Font.Size;
   first.ForeColor = ForeColor;
   first.ToolTip = "首页";
   first.Text = "9";
   first.Enabled = isValidPage && canMoveBack;
   cell.Controls.Add(first);

   cell.Controls.Add(new LiteralControl("&nbsp;"));

   LinkButton prev = new LinkButton();
   prev.CausesValidation = false;
   prev.ID = "Prev";
   prev.Click += new EventHandler(Prev_Click);
   prev.Font.Name = "webdings";
   prev.Font.Size = Font.Size;
   prev.ForeColor = ForeColor;
   prev.ToolTip = "上一页";
   prev.Text = "3";
   prev.Enabled = isValidPage && canMoveBack;
   cell.Controls.Add(prev);

   cell.Controls.Add(new LiteralControl("&nbsp;"));

   if (PageCount <= 10)
   {
    for (int i = 0; i < PageCount; i++)
    {
     LinkButton lbt = new LinkButton();
     lbt.CausesValidation = false;
     lbt.ID = "Numeric" + i.ToString();
     lbt.Click += new EventHandler(NumericLinkButton_Click);
     lbt.Font.Size = Font.Size;
     lbt.Text = (i + 1).ToString();
     if (i == CurrentPageIndex)
     {
      lbt.Enabled = false;
     }
     cell.Controls.Add(lbt);
     cell.Controls.Add(new LiteralControl("&nbsp;"));
    }
   }
   else
   {
    int maxPageIndex;
    int minPageIndex = 0;
    if ((CurrentPageIndex + 4) > (PageCount - 1))
    {
     maxPageIndex = PageCount - 1;
    }
    else
    {
     maxPageIndex = CurrentPageIndex + 4;
    }
    if (maxPageIndex < 9)
    {
     maxPageIndex = 9;
    }
    minPageIndex = maxPageIndex - 9;
    for (int i = minPageIndex; i <= maxPageIndex; i++)
    {
     LinkButton lbt = new LinkButton();
     lbt.CausesValidation = false;
     lbt.ID = "Numeric" + i.ToString();
     lbt.Click += new EventHandler(NumericLinkButton_Click);
     lbt.Font.Size = Font.Size;
     lbt.Text = (i + 1).ToString();
     if (i == CurrentPageIndex)
     {
      lbt.Enabled = false;
     }
     cell.Controls.Add(lbt);
     cell.Controls.Add(new LiteralControl("&nbsp;"));
    }
   }
   LinkButton next = new LinkButton();
   next.CausesValidation = false;
   next.ID = "Next";
   next.Click += new EventHandler(Next_Click);
   next.Font.Name = "webdings";
   next.Font.Size = Font.Size;
   next.ForeColor = ForeColor;
   next.ToolTip = "下一页";
   next.Text = "4";
   next.Enabled = isValidPage && canMoveForward;
   cell.Controls.Add(next);

   cell.Controls.Add(new LiteralControl("&nbsp;"));

   LinkButton last = new LinkButton();
   last.CausesValidation = false;
   last.ID = "Last";
   last.Click += new EventHandler(Last_Click);
   last.Font.Name = "webdings";
   last.Font.Size = Font.Size;
   last.ForeColor = ForeColor;
   last.ToolTip = "尾页";
   last.Text = ":";
   last.Enabled = isValidPage && canMoveForward;
   cell.Controls.Add(last);
  }

  private void BuildTextPagesUI(TableCell cell)
  {
   bool isValidPage = (CurrentPageIndex >= 0 && CurrentPageIndex <= TotalPages - 1);
   bool canMoveBack = (CurrentPageIndex > 0);
   bool canMoveForward = (CurrentPageIndex < TotalPages - 1);

   LinkButton first = new LinkButton();
   first.CausesValidation = false;
   first.ID = "First";
   first.Click += new EventHandler(First_Click);
   first.Font.Name = Font.Name;
   first.Font.Size = Font.Size;
   first.ForeColor = ForeColor;
   first.Text = "首页";
   first.Enabled = isValidPage && canMoveBack;
   cell.Controls.Add(first);

   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

   LinkButton prev = new LinkButton();
   prev.CausesValidation = false;
   prev.ID = "Prev";
   prev.Click += new EventHandler(Prev_Click);
   prev.Font.Name = Font.Name;
   prev.Font.Size = Font.Size;
   prev.ForeColor = ForeColor;
   prev.Text = "上一页";
   prev.Enabled = isValidPage && canMoveBack;
   cell.Controls.Add(prev);

   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

   LinkButton next = new LinkButton();
   next.CausesValidation = false;
   next.ID = "Next";
   next.Click += new EventHandler(Next_Click);
   next.Font.Name = Font.Name;
   next.Font.Size = Font.Size;
   next.ForeColor = ForeColor;
   next.Text = "下一页";
   next.Enabled = isValidPage && canMoveForward;
   cell.Controls.Add(next);

   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

   LinkButton last = new LinkButton();
   last.CausesValidation = false;
   last.ID = "Last";
   last.Click += new EventHandler(Last_Click);
   last.Font.Name = Font.Name;
   last.Font.Size = Font.Size;
   last.ForeColor = ForeColor;
   last.Text = "尾页";
   last.Enabled = isValidPage && canMoveForward;
   cell.Controls.Add(last);
  }

  private void BuildGoToPagesUI(TableCell cell)
  {
   DropDownList pageList = new DropDownList();
   //pageList.CausesValidation = false;
   pageList.Enabled =true;
   pageList.ID = "PageList";
   pageList.AutoPostBack = true;
   pageList.SelectedIndexChanged += new EventHandler(PageList_Click);
   pageList.Font.Name = Font.Name;
   pageList.Font.Size = Font.Size;
   pageList.ForeColor = ForeColor;

   if (TotalPages <= 0 || CurrentPageIndex == -1)
   {
    pageList.Items.Add("没有记录");
    pageList.Enabled = false;
    pageList.SelectedIndex = 0;
   }
   else
   {
    for (int i = 1; i <= TotalPages; i++)
    {
     ListItem item = new ListItem(i.ToString(), (i - 1).ToString());
     pageList.Items.Add(item);
    }
    pageList.SelectedIndex = CurrentPageIndex;
   }
   cell.Controls.Add(new LiteralControl("跳转至&nbsp;"));
   cell.Controls.Add(pageList);
   cell.Controls.Add(new LiteralControl("&nbsp;页"));
  }
  private void BuildCurrentPage(TableCell cell)
  {
   if (CurrentPageIndex < 0 || CurrentPageIndex >= TotalPages)
   {
    cell.Controls.Add(new LiteralControl(NoPageSelectedText));
   }
   else
   {
    cell.Controls.Add(new LiteralControl(string.Format(CurrentPageText, (CurrentPageIndex + 1), TotalPages)));
   }
   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;每页&nbsp;&nbsp;"));
   DropDownList ddl = new DropDownList();
   //ddl.CausesValidation = false;
   ddl.Enabled=true;
   ddl.AutoPostBack = true;
   ddl.SelectedIndexChanged += new EventHandler(ChangeItemsPerPage);
   ddl.Font.Name = Font.Name;
   ddl.Font.Size = Font.Size;
   ddl.ForeColor = ForeColor;           
   for (int i = 0; i <9; i++)
   {
    int itemsPerPage = 10 + 5*i;
    ddl.Items.Add(new ListItem(itemsPerPage.ToString(), itemsPerPage.ToString()));
   }
           
   ddl.SelectedIndex = (ItemsPerPage - 10) / 5;
   cell.Controls.Add(ddl);
   cell.Controls.Add(new LiteralControl("&nbsp;&nbsp;行"));
  }
  private void ValidatePageIndex()
  {
   if (!(CurrentPageIndex >= 0 && CurrentPageIndex < TotalPages))
   {
    CurrentPageIndex = 0;
   }          
   return;
  }
       
  private void FetchPageData()
  {
   AdjustSelectCommand();
   VirtualRecordCount countInfo = new VirtualRecordCount();
   if (!IsPostBack)
   {
    countInfo = CalculateVirtualRecordCount();
    TotalPages = countInfo.PageCount;
    RecordCount = countInfo.RecordCount;
   }
   else
   {
    countInfo.PageCount = PageCount;
    countInfo.RecordCount = RecordCount;
    countInfo.RecordsInLastPage = ItemsPerPage;
    int remainer = RecordCount % ItemsPerPage;
    if (remainer > 0)
    {
     countInfo.RecordsInLastPage = remainer;
    }
   }

   ValidatePageIndex();
   if (CurrentPageIndex == -1)
   {
    return;
   }
   OracleCommand cmd = PrepareCommand(countInfo);
   if (cmd == null)
   {
    return;
   }
   OracleDataAdapter adapter = new OracleDataAdapter(cmd);
   //DataTable data = new DataTable();
   //adapter.Fill(data);
   _dataSource = new DataTable();           
   adapter.Fill(_dataSource);
   //if (_dataSource == null)
   //{
   //    _dataSource = new PagedDataSource();
   //}
   //_dataSource.AllowCustomPaging = true;
   //_dataSource.AllowPaging = true;
   //_dataSource.CurrentPageIndex = 0;
   //if (CurrentPageIndex == countInfo.PageCount - 1)
   //{
   //    _dataSource.PageSize = countInfo.RecordsInLastPage;
   //}
   //else
   //{
   //    _dataSource.PageSize = ItemsPerPage;
   //}
   //_dataSource.VirtualCount = countInfo.RecordCount;
   //_dataSource.DataSource = data.DefaultView;
  }

  private void AdjustSelectCommand()
  {
   string temp = SelectCommand.ToLower();
   int pos = temp.IndexOf("order by");
   if (pos > -1)
   {
    SelectCommand = SelectCommand.Substring(0, pos);
   }           
  }

  private VirtualRecordCount CalculateVirtualRecordCount()
  {
   VirtualRecordCount count = new VirtualRecordCount();
   count.RecordCount = GetQueryVirtualCount();
   count.RecordsInLastPage = ItemsPerPage;
   int lastPage = count.RecordCount / ItemsPerPage;
   int remainder = count.RecordCount % ItemsPerPage;
   if (remainder > 0)
   {
    lastPage++;
    count.RecordsInLastPage = remainder;
   }
   count.PageCount = lastPage;          
   return count;
  }

  private OracleCommand PrepareCommand(VirtualRecordCount countInfo)
  {
//   if (SortField == "")
//   {
//    string text;
//    if (SelectCommand.ToUpper().IndexOf("WHERE ") > 0)
//    {
//     text = SelectCommand + " AND 1>2";
//    }
//    else
//    {
//     text = SelectCommand + " WHERE 1>2";
//    }
//    
//    // string text = "SET FMTONLY ON;" + SelectCommand + ";SET FMTONLY OFF;";
//    OracleDataAdapter adapter = new OracleDataAdapter(text, ConnectionString);
//    DataTable t = new DataTable();
//    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
//    adapter.Fill(t);
//    DataColumn col = null;
//    if (t.PrimaryKey.Length > 0)
//    {
//     col = t.PrimaryKey[0];
//    }
//    else
//    {
//     col = t.Columns[0];
//    }
//    SortField = col.ColumnName;
//   }

   int recsToRetrieve = ItemsPerPage;
   if (CurrentPageIndex == countInfo.PageCount - 1)
   {
    recsToRetrieve = countInfo.RecordsInLastPage;
   }
   string cmdText;
   if(SortField == string.Empty)
   {
    cmdText = string.Format(QueryPageCommandTextNoOrder,
     SelectCommand,
     ItemsPerPage * CurrentPageIndex + 1,
     ItemsPerPage * CurrentPageIndex + recsToRetrieve);
   }
   else
   {
    switch (SortingMode)
    {
     case SortingMode.ASC:
      cmdText = string.Format(QueryPageCommandText,
       SelectCommand,
       ItemsPerPage * CurrentPageIndex + 1,
       ItemsPerPage * CurrentPageIndex + recsToRetrieve,       
       SortField,
       "ASC"
       );
      break;
     case SortingMode.DESC:
      cmdText = string.Format(QueryPageCommandText,
       SelectCommand,
       ItemsPerPage * CurrentPageIndex + 1,
       ItemsPerPage * CurrentPageIndex + recsToRetrieve,       
       SortField,
       "DESC"
       );
      break;
     default:
      cmdText = string.Format(QueryPageCommandText,
       SelectCommand,
       ItemsPerPage * CurrentPageIndex + 1,
       ItemsPerPage * CurrentPageIndex + recsToRetrieve,       
       SortField,
       "ASC"
       );
      break;
    }
   }

   OracleConnection conn = new OracleConnection(ConnectionString);
   OracleCommand cmd = new OracleCommand(cmdText, conn);
   return cmd;
  }

  private int GetQueryVirtualCount()
  {
   string cmdText = string.Format(QueryCountCommandText, SelectCommand);
   OracleConnection conn = new OracleConnection(ConnectionString);
   OracleCommand cmd = new OracleCommand(cmdText, conn);
   cmd.Connection.Open();
   int recCount = int.Parse(cmd.ExecuteScalar().ToString());
   cmd.Connection.Close();
   return recCount;
  }

  private void GoToPage(int pageIndex)
  {
   PageChangedEventArgs e = new PageChangedEventArgs();
   e.OldPageIndex = CurrentPageIndex;
   e.NewPageIndex = pageIndex;
   CurrentPageIndex = pageIndex;
   OnPageIndexChanged(e);
   BindDataControl();
  }

  private void First_Click(object sender, EventArgs e)
  {
   GoToPage(0);
  }

  private void Prev_Click(object sender, EventArgs e)
  {
   GoToPage(CurrentPageIndex - 1);
  }

  private void Next_Click(object sender, EventArgs e)
  {
   GoToPage(CurrentPageIndex + 1);
  }

  private void Last_Click(object sender, EventArgs e)
  {
   GoToPage(TotalPages - 1);
  }

  private void PageList_Click(object sender, EventArgs e)
  {
   DropDownList pageList = (DropDownList)sender;
   int pageIndex = Convert.ToInt32(pageList.SelectedItem.Value);
   GoToPage(pageIndex);
  }

  private void ChangeItemsPerPage(object sender, EventArgs e)
  {
   DropDownList ddl = (DropDownList)sender;
   ItemsPerPage = Convert.ToInt32(ddl.SelectedItem.Value);
   int lastPage = RecordCount / ItemsPerPage;
   int remainer = RecordCount % ItemsPerPage;
   if (remainer > 0)
   {
    lastPage++;               
   }
   TotalPages = lastPage;
   int pageIndex = (CurrentPageIndex > lastPage) ? (lastPage - 1) : CurrentPageIndex;
   GoToPage(pageIndex);
  }
  private void NumericLinkButton_Click(object sender, EventArgs e)
  {
   LinkButton lbt = (LinkButton)sender;
   int pageIndex = Convert.ToInt32(lbt.Text) - 1;
   GoToPage(pageIndex);
  }
  #endregion
 }

 #region 排序模式
 public enum SortingMode
 {
  ASC,
  DESC
 }
 #endregion

 #region 分页样式
 public enum PagerStyle
 {
  NextPrev,
  NumericPages,
  TextPages
 }
 #endregion

 #region 虚拟记录数类
 public class VirtualRecordCount
 {
  public int RecordCount;
  public int PageCount;
  public int RecordsInLastPage;
 }
 #endregion

 #region 分页事件参数类
 public class PageChangedEventArgs : EventArgs
 {
  public int OldPageIndex;
  public int NewPageIndex;
 }
 #endregion
}

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