对DataGrid应用又有新需求，求助，请大家讨论！

using System;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Resources;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace DataGridPro
{
   public class jjstarDataGrid: DataGrid,IPostBackEventHandler
  {

    [Category("²¼¾Ö"),Description("DataGridËùÔÚÈÝÆ÷¿í¶È¡£")]
    public virtual Unit FrameWidth
    {
      get
      {
        object obj=ViewState["FrameWidth"];
        return ((null ==obj ) ? Width : (Unit)obj);
      }
      set
      {
        ViewState["FrameWidth"] = value;
      }
    }
    [Category("Íâ¹Û"),Description("Êó±êËùÔÚÐÐµÄÑÕÉ«¡£")]
    [Editor(typeof(ColorEditor),typeof(UITypeEditor))]
    public Color CurrentRowColor
    {
      get
      {
        object obj=ViewState["CurrentRowColor"];
        return ((null ==obj ) ? BackColor : (Color)obj);
      }
      set
      {
        ViewState["CurrentRowColor"]=value;
      }
    }
      [Category("ÑùÊ½"),Description("DataGridµÄÏÔÊ¾Ä£Ê½¡£")]
    [TypeConverter(typeof(modeConverter))]
    public string DisplayMode
    {
      get
      {
        object obj=ViewState["mode"];
        return ((null ==obj ) ? "ScrollMode" : (string)obj);
      }
      set
      {
        ViewState["mode"]=value;
      }
    }
      public event EventHandler Scroll2Foot;
       public event EventHandler Scroll2Top;
      public event DataGridItemEventHandler Click;
      public event DataGridItemEventHandler DblClick;
    protected void OnClick(int index)
    {
      if(null!=Click)
        Click(this,new DataGridItemEventArgs(Items[index]));
    }
    protected void OnDblClick(int index)
    {
      if(null!=DblClick)
        DblClick(this,new DataGridItemEventArgs(Items[index]));
    }
    protected void OnScroll2Foot()
    {
      if(null!=Scroll2Foot)
        Scroll2Foot(this,new EventArgs());
    }
    protected void OnScroll2Top()
    {
      if(null!=Scroll2Top)
        Scroll2Top(this,new EventArgs());
    }

    public void RaisePostBackEvent(string eventArgument)
    {
      if("SCROLLMODE"==DisplayMode.ToUpper())
      {
        if("SCROLL2TOP"==eventArgument.ToUpper())
        {
          OnScroll2Top();
          return;
        }
        if("SCROLL2FOOT"==eventArgument.ToUpper())
        {
          OnScroll2Foot();
          return;
        }
      }
      if(eventArgument.StartsWith("CLK"))
      {
        eventArgument=
          eventArgument.TrimStart(new Char[]{'C','L','K'});
        OnClick(Convert.ToInt32(eventArgument));
        return;
      }
      if(eventArgument.StartsWith("DBL"))
      {
        eventArgument=
          eventArgument.TrimStart(new Char[]{'D','B','L'});
        OnDblClick(Convert.ToInt32(eventArgument));
        return;
      }
    }
    protected override void OnItemDataBound(DataGridItemEventArgs e)
    {
      base.OnItemDataBound(e);
      if((ListItemType.Pager==e.Item.ItemType)||
        (ListItemType.Footer==e.Item.ItemType))
      {
        return;
      }
      if(ListItemType.Header!=e.Item.ItemType)
      {
        e.Item.Attributes["id"]=
          e.Item.ItemType.ToString()+e.Item.ItemIndex.ToString();
        e.Item.Attributes["OnMouseOut"]=
          "javascript:bgColor='"+BackColor.Name.ToString()+"';";
        e.Item.Attributes["OnMouseOver"]=
          "javascript:bgColor='"+CurrentRowColor.Name.ToString()+"';";        e.Item.Attributes["OnDblClick"]=
          "javascript:"+UniqueID+"_dbl("+e.Item.ItemIndex.ToString()+");";

        e.Item.Attributes["OnClick"]=
          "javascript:"+UniqueID+"_clk("+e.Item.ItemIndex.ToString()+");";
      }
      else
      {
        int cellCount=e.Item.Cells.Count;
        for(int index=0;index<cellCount;index++)
        {
          e.Item.Cells[index].Attributes["id"]=
            "HEADER"+index.ToString();
        }
      }
    }

解决方案 »

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private string clickScript(bool canClick,bool canDblClick)
    {
      StringBuilder sbScript=new StringBuilder();
      sbScript.Append("<script language='javascript'>")//;
        //µ¥»÷±êÖ¾
        .Append(
        "var "+UniqueID+"_click=0;")
        //Ë«»÷±êÖ¾
        .Append(
        "var "+UniqueID+"_dblclick=0;")
        //±»µ¥»÷»òË«»÷µÄÐÐ±êÖ¾
        .Append(
        "var "+UniqueID+"_row;")
        //µ¥»÷ÊÂ¼þ
        .Append(
        "function "+UniqueID+"_clk(row)")
        .Append("{")
        .Append(
        "if((\"TD\"==event.srcElement.tagName)||(\"TR\"==event.srcElement.tagName))")
        .Append("{")
        .Append(UniqueID+"_click++;")
        .Append(UniqueID+"_row=row;")
        .Append(
        "setTimeout('"+UniqueID+"_submit()',300)")
        .Append("}")
        .Append("}")
        //Ë«»÷ÊÂ¼þ
        .Append(
        "function "+UniqueID+"_dbl(row)")
        .Append("{")
        .Append(
        "if((\"TD\"==event.srcElement.tagName)||(\"TR\"==event.srcElement.tagName))")
        .Append("{")
        .Append(UniqueID+"_dblclick++;")
        .Append(UniqueID+"_row=row;")
        .Append("}")
        .Append("}")
        //Ìá½»µ¥Ë«»÷ÊÂ¼þ
        .Append(
        "function "+UniqueID+"_submit()")
        .Append("{")
        .Append(
        "if((1=="+UniqueID+"_click)&&(1=="+UniqueID+"_dblclick))")
        .Append("{");
      if(true==canDblClick)
      {
        sbScript.Append(
          "__doPostBack('"+UniqueID+"','DBL'+"+UniqueID+"_row);");
      }
      sbScript.Append("}")
        .Append("else {");
      if(true==canClick)
      {
        sbScript.Append(
          "__doPostBack('"+UniqueID+"','CLK'+"+UniqueID+"_row);");
      }
      sbScript.Append("}")
        //µ¥»÷±êÖ¾¸´Î»
        .Append(
        UniqueID+"_click=0;")
        //Ë«»÷±êÖ¾¸´Î»
        .Append(
        UniqueID+"_dblclick=0;")
        .Append("}")
        .Append("</script>");
      return sbScript.ToString();
    }
你放控件上去，动态修改pageindex等属性，重新绑定应该可以
private string scrollTableScript(bool canScroll)
    {
      StringBuilder sbScript=new StringBuilder();
      sbScript.Append("<script language='javascript'>");
      if(true==canScroll)
      {
        //±£´ædatagrid¸ß¶È
        sbScript.Append(
          "var "+UniqueID+"_dgHeight="
          +UniqueID+"_sp.scrollHeight;")
          //¹ö¶¯±íÉÏÑØ¸ß¶È
          .Append(
          UniqueID+"_rTop.style.height="
          +CurrentPageIndex+"*"+UniqueID+"_dgHeight;");
        //¹ö¶¯±íÏÂÑØ¸ß¶È
        if(0==PageCount)
        {
          sbScript.Append(
            UniqueID+"_rFoot.style.height=0;");
        }
        else
        {
          sbScript.Append(
            UniqueID+"_rFoot.style.height="
            +"("+PageCount+"-"+CurrentPageIndex+"-1)*"+UniqueID+"_dgHeight;");
        }
        //ÈÝÆ÷¸ß¶È
        sbScript.Append(
          UniqueID+"_sp.style.height="
          +UniqueID+"_dgHeight+20;");
        //¹ö¶¯ÌõÎ»ÖÃ
        if(PageCount==CurrentPageIndex+1)
        {
          sbScript.Append(
            UniqueID+"_sp.scrollTop="
            +"100+"+UniqueID+"_dgHeight*"+CurrentPageIndex+";");
        }
        else
        {
          sbScript.Append(
            UniqueID+"_sp.scrollTop="
            +UniqueID+"_dgHeight*"+CurrentPageIndex+";");
        }
        //±£´æ¹ö¶¯ÌõÎ»ÖÃ
        sbScript.Append(
          "var "+UniqueID+"_scrollPos="+UniqueID+"_sp.scrollTop;")
          //¹ö¶¯ÊÂ¼þ±êÖ¾ÎªÎ´´¥·¢
          .Append("var "+UniqueID+"_scrolled=0;");
      }
      else
      {
        //Î´·ÖÒ³£¬²»ÏÔÊ¾´¹Ö±¹ö¶¯Ìõ
        sbScript.Append(
          UniqueID+"_sp.style.height="
          +UniqueID+"_sp.scrollHeight+20;");
      }
      sbScript.Append("</script>");
      return sbScript.ToString();
    }
private string scrollEventScript(bool canScroll)
    {
      StringBuilder sbScript=new StringBuilder();
      //´¦Àí¹ö¶¯ÊÂ¼þ
      sbScript.Append("<script language='javascript'>")
        .Append("function "+UniqueID+"_scroll()")
        .Append("{");
      if(true==canScroll)
      {
        sbScript.Append("if(1=="+UniqueID+"_scrolled) return;")
          .Append("var "+UniqueID+"_currentPos="
          +UniqueID+"_sp.scrollTop;")
          //¹ö¶¯·¢ÉúÁËÂð£¿
          .Append(
          "if("+UniqueID+"_currentPos!="+UniqueID+"_scrollPos)")
          .Append("{")
          .Append(UniqueID+"_rTop.style.height=0;")
          .Append(UniqueID+"_rFoot.style.height=0;")
          //¹ö¶¯ÊÂ¼þ±êÖ¾ÎªÒÑ´¥·¢
          .Append(UniqueID+"_scrolled=1;")
          .Append(
          "if("+UniqueID+"_currentPos>"+UniqueID+"_scrollPos)")
          .Append("{")
          //Ìá½»ÏòÏÂ¹ö¶¯ÊÂ¼þ
          .Append(
          Page.GetPostBackEventReference(this,"scroll2foot")+";")
          .Append("}")
          .Append("else{")
          //Ìá½»ÏòÉÏ¹ö¶¯ÊÂ¼þ
          .Append(
          Page.GetPostBackEventReference(this,"scroll2top")+";")
          .Append("}")
          .Append("}");
      }
      sbScript.Append("}")
        .Append("</script>");
      return sbScript.ToString();
    }
    protected override void OnPreRender(EventArgs e)
    {
      Page.GetPostBackEventReference(this);
      //×¢²áµ¥»÷Ë«»÷ÊÂ¼þ½Å±¾
      Page.RegisterStartupScript(
        UniqueID+"clickScript",
        clickScript((null==Click)?false:true,(null==DblClick)?false:true));
      if("SCROLLMODE"==DisplayMode.ToUpper())
      {
        //×¢²á¹ö¶¯±íÃèÊö½Å±¾
        Page.RegisterStartupScript(
          UniqueID+"scrollTableScript",
          scrollTableScript(AllowPaging));
        //×¢²á¹ö¶¯ÊÂ¼þ½Å±¾
        Page.RegisterStartupScript(
          UniqueID+"scrollEventScript",
          scrollEventScript(AllowPaging));
      }
    }
protected override void Render(HtmlTextWriter output)
    {
      //Í¨¹ýÊôÐÔDisplayModeÅÐ¶ÏDataGridµÄ³ÊÏÖÄ£Ê½
      if("SCROLLMODE"==DisplayMode.ToUpper())
      {
        //»ÈÝÆ÷£¨ÓÃÀ´ÈÝÄÉdatagrid£©
        output.Write(
          "<div id='"+UniqueID+"_sp' "
          +"style='OVERFLOW: auto; "
          +"WIDTH:"+FrameWidth.Value.ToString()+"; "
          //StyleÃ»ÓÐË÷ÒýÆ÷£¬
          //ËùÒÔÎÒÃ»ÄÜ°ÑËùÓÐÑùÊ½¸´ÖÆ¹ýÀ´
          //ÄÄÎ»´óÏÀÄÜ°ïÎÒ
          +"LEFT:"+Style["LEFT"]+"; "
          +"TOP:"+Style["TOP"]+"; "
          +"POSITION:"+Style["POSITION"]+"; "
          +"Z-INDEX:"+Style["Z-INDEX"]+"; "
          +"' "
          //Õâ¸öonscroll²»ÓÃtry/catch°üÆðÀ´
          //¾Í»á±¨´í
          //ÎªÊ²Ã´»áÕâÑù£¿
          //+"onscroll='"+UniqueID+"_scroll()'>");
          +"onscroll='try{"+UniqueID+"_scroll()}catch(e){}'>");
        //»¹ö¶¯±í
        output.Write(
          "<table id='"+UniqueID+"_table' "
          +"style='WIDTH:"+FrameWidth.Value.ToString()+"; "
          +"'>");
        //»¹ö¶¯±íÉÏÑØ
        output.Write(
          "<tr id='"+UniqueID+"_rTop' "
          +"style='HEIGHT:0; WIDTH:"+FrameWidth.Value.ToString()
          +"'><td/></tr>");
        //datagridËùÔÚÎ»ÖÃ
        output.Write(
          "<tr id='"+UniqueID+"_rDG' "
          +"style='WIDTH:"+FrameWidth.Value.ToString()
          +"'><td>");
        //ÇåÀídatagridÔÓÐÊôÐÔ
        Style["LEFT"]="0";
        Style["TOP"]="0";
        Style["POSITION"]="relative";
        PagerStyle.Visible=false;
        //Êä³ödatagrid
        base.Render(output);
        output.Write("</td></tr>");
        //»¹ö¶¯±íÏÂÑØ
        output.Write(
          "<tr id='"+UniqueID+"_rFoot' "
          +"style='HEIGHT:0; WIDTH:"+FrameWidth.Value.ToString()
          +"'><td/></tr></table>");
        //»ÈÝÆ÷½áÊø
        output.Write("</div>");
      }
      else
      {
        //Ö»Êä³ödatagrid
        base.Render(output);
      }
    }
public class modeConverter:TypeConverter
    {
      public modeConverter(){}
      /// <summary>
      /// ´æ´¢ÒªÌá¹©µÄËùÓÐ±ê×¼Öµ¡£
      /// </summary>
      private static StandardValuesCollection _modeList;
      /// <summary>
      /// »ñÈ¡±ê×¼Öµ¡£
      /// </summary>
      /// <returns>
      /// ±ê×¼Öµ¡£
      /// </returns>
      private StandardValuesCollection getModeList()
      {
        if(null==_modeList)
        {
          string[] mode=new string[]{"OriginalMode","ScrollMode"};
          _modeList=new StandardValuesCollection(mode);
        }
        return _modeList;
      }
      /// <summary></summary>
      /// <param name="context"></param>
      /// <returns>
      /// ·µ»Øtrue£¬±íÊ¾Ìá¹©±ê×¼Öµ¡£
      /// </returns>
      public override bool
        GetStandardValuesSupported(ITypeDescriptorContext context)
      {return true;}
      /// <summary></summary>
      /// <param name="context"></param>
      /// <returns>
      /// ·µ»Øtrue£¬
      /// ±íÊ¾±ê×¼ÖµÖ»ÄÜÍ¨¹ýÏÂÀÁÐ±íÑ¡Ôñ¡£
      /// </returns>
      public override bool
        GetStandardValuesExclusive(ITypeDescriptorContext context)
      {return true;}
      /// <summary>
      /// ·µ»ØÒªÔÚÏÂÀÁÐ±íÖÐÌá¹©µÄ±ê×¼Öµ¡£
      /// </summary>
      /// <param name="context"></param>
      /// <returns>
      /// ÔÚÏÂÀÁÐ±íÖÐÌá¹©µÄ±ê×¼Öµ¡£
      /// </returns>
      public override StandardValuesCollection
        GetStandardValues(ITypeDescriptorContext context)
      {
        return getModeList();
      }
    }
#endregion
  }
}
To goody9807() 先谢谢你这么热情的写这么多，我不知道他们之间的关系，请给一点说明，我正在努力看，呵呵。谢谢你
goody9807()把源代码都写给你了！真热心，象你学习！：）
你的重点还是在PageIndex上，就象 latahu(邋遢胡)所说，可以放一个LinkButton在里面设置PageIndex值，重新绑定DataGrid，应该是可以的。
至于记录数，我不明白你取它的用意是什么，是所有的记录数还是当前页的记录数？（因为你有一个每页显示的记录数），如果你要的是所有的记录数，可以参考：
((DataTable)DataGrid1.Datasource).Rows.Count;
选择每页显示的数目，你可以用DropDownList与Button配合去实现
方法很多，多试试吧