分页控件

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： {0} / {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;

  }

  #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

    return (PagerStyle)ViewState["PagerStyle"];

    ViewState["PagerStyle"] = value;

  [Description("获取和设置默认的排序方式")]

  public SortingMode SortingMode

    return (SortingMode)ViewState["SortingMode"];

    ViewState["SortingMode"] = value;

  [Description("获取和设置需要分页控件的名称")]

  public string ControlToPaginate

    return Convert.ToString(ViewState["ControlToPaginate"]);

    ViewState["ControlToPaginate"] = value;

  [Description("获取和设置每页显示的记录数")]

  public int ItemsPerPage

    return Convert.ToInt32(ViewState["ItemsPerPage"]);

    ViewState["ItemsPerPage"] = value;

  [Description("获取和设置当前页数")]

  public int CurrentPageIndex

    return Convert.ToInt32(ViewState["CurrentPageIndex"]);

    ViewState["CurrentPageIndex"] = value;

  [Description("获取和设置记录数")]

  public int RecordCount

    return Convert.ToInt32(ViewState["RecordCount"]);

    ViewState["RecordCount"] = value;

  [Browsable(false)]

  private bool IsSorted

    return Convert.ToBoolean(ViewState["SqlPager_IsSorted"]);

    ViewState["SqlPager_IsSorted"] = value;

  private bool IsPostBack

    return Convert.ToBoolean(ViewState["SqlPager_IsPostBack"]);

    ViewState["SqlPager_IsPostBack"] = value;

  private string ConnectionString

    return ConfigurationSettings.AppSettings["ConnectionString"].ToString();

  [Description("获取和设置查询的SQL语句")]

  public string SelectCommand

    return Convert.ToString(ViewState["SelectCommand"]);

    ViewState["SelectCommand"] = value;

  [Description("获取和设置排序字段")]

  public string SortField

    return Convert.ToString(ViewState["SortKeyField"]);

    ViewState["SortKeyField"] = value;

  public int PageCount

    return TotalPages;

  protected int TotalPages

    return Convert.ToInt32(ViewState["TotalPages"]);

    ViewState["TotalPages"] = value;

  public override void DataBind()

   BindDataControl();

   IsPostBack = true;

  public void ReDataBind()

   IsPostBack = false;           

  private void BindDataControl()

   base.DataBind();

   ChildControlsCreated = false;

   if (ControlToPaginate == "")

    return;

   _controlToPaginate = this.Page.FindControl(ControlToPaginate);

   //_controlToPaginate = Page.FindControl(ControlToPaginate);

   if (_controlToPaginate == null)

   if (!(_controlToPaginate is DataGrid || _controlToPaginate is BaseDataList || _controlToPaginate is ListControl))

   if (ConnectionString == "" || SelectCommand == "")

   FetchPageData();

   DataGrid compositeDataBoundControl = null;

   BaseDataList baseDataListControl = null;

   ListControl listControl = null;

   if (_controlToPaginate is DataGrid)

    compositeDataBoundControl = (DataGrid)_controlToPaginate;

    compositeDataBoundControl.DataSource = _dataSource;

    compositeDataBoundControl.DataBind();

   if (_controlToPaginate is BaseDataList)

    baseDataListControl = (BaseDataList)_controlToPaginate;

    baseDataListControl.DataSource = _dataSource;

    baseDataListControl.DataBind();

   if (_controlToPaginate is ListControl)

    listControl = (ListControl)_controlToPaginate;

    listControl.Items.Clear();

    listControl.DataSource = _dataSource;

    listControl.DataBind();

  }      

  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))

   if (sortExpress.ToLower() == SortField.ToLower())

    if (SortingMode == SortingMode.ASC)

    {

     SortingMode = SortingMode.DESC;

    }

    else

     SortingMode = SortingMode.ASC;

   else

    SortingMode = SortingMode.ASC;

   SortField = sortExpress;

   SortHandle();

  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;

     }

    }    

  }  

  #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("    "));

   if (PagerStyle == PagerStyle.NextPrev)

    BuildNextPrevUI(cellNavBar);

   else if (PagerStyle == PagerStyle.NumericPages)

    BuildNumericPagesUI(cellNavBar);

    BuildTextPagesUI(cellNavBar);

   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("  "));

   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("  "));           

   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);

   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)

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

   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(" "));

    int maxPageIndex;

    int minPageIndex = 0;

    if ((CurrentPageIndex + 4) > (PageCount - 1))

     maxPageIndex = PageCount - 1;

     maxPageIndex = CurrentPageIndex + 4;

    if (maxPageIndex < 9)

     maxPageIndex = 9;

    minPageIndex = maxPageIndex - 9;

    for (int i = minPageIndex; i <= maxPageIndex; i++)

  private void BuildTextPagesUI(TableCell cell)

   first.Font.Name = Font.Name;

   first.Text = "首页";

   prev.Font.Name = Font.Name;

   prev.Text = "上一页";

   next.Font.Name = Font.Name;

   next.Text = "下一页";

   last.Font.Name = Font.Name;

   last.Text = "尾页";

  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;

    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 "));

   cell.Controls.Add(pageList);

   cell.Controls.Add(new LiteralControl(" 页"));

  private void BuildCurrentPage(TableCell cell)

   if (CurrentPageIndex < 0 || CurrentPageIndex >= TotalPages)

    cell.Controls.Add(new LiteralControl(NoPageSelectedText));

    cell.Controls.Add(new LiteralControl(string.Format(CurrentPageText, (CurrentPageIndex + 1), TotalPages)));

   cell.Controls.Add(new LiteralControl("  每页  "));

   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("  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;

    countInfo.PageCount = PageCount;

    countInfo.RecordCount = RecordCount;

    countInfo.RecordsInLastPage = ItemsPerPage;

    int remainer = RecordCount % ItemsPerPage;

    if (remainer > 0)

     countInfo.RecordsInLastPage = remainer;

   ValidatePageIndex();

   if (CurrentPageIndex == -1)

   OracleCommand cmd = PrepareCommand(countInfo);

   if (cmd == null)

   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];

//     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);

    switch (SortingMode)

     case SortingMode.ASC:

      cmdText = string.Format(QueryPageCommandText,

       SelectCommand,

       ItemsPerPage * CurrentPageIndex + 1,

       ItemsPerPage * CurrentPageIndex + recsToRetrieve,       

       SortField,

       "ASC"

       );

      break;

     case SortingMode.DESC:

       "DESC"

     default:

   OracleConnection conn = new OracleConnection(ConnectionString);

   OracleCommand cmd = new OracleCommand(cmdText, conn);

   return cmd;

  private int GetQueryVirtualCount()

   string cmdText = string.Format(QueryCountCommandText, SelectCommand);

   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);

  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;

  private void NumericLinkButton_Click(object sender, EventArgs e)

   LinkButton lbt = (LinkButton)sender;

   int pageIndex = Convert.ToInt32(lbt.Text) - 1;

 }

 #region 排序模式

 public enum SortingMode

  ASC,

  DESC

 #endregion

 #region 分页样式

 public enum PagerStyle

  NextPrev,

  NumericPages,

  TextPages

 #region 虚拟记录数类

 public class VirtualRecordCount

  public int RecordCount;

  public int PageCount;

  public int RecordsInLastPage;

 #region 分页事件参数类

 public class PageChangedEventArgs : EventArgs

  public int OldPageIndex;

  public int NewPageIndex;

}