Gridview的多选及全选

多选:
    1.用<INPUT id="checkedIDs" type=hidden runat="server" /> 记录选中项
    2.Gridview 控件RowDataBound事件中保持状态
    3.应用时从<INPUT id="checkedIDs" type=hidden runat="server" /> 取得选中项
    代码:
    [前台主要代码] 
   

<INPUT id="checkedIDs" type=hidden runat="server" /> 

<ItemTemplate>
<INPUT id="Checkbox2" onclick="checkAll(this)" type=checkbox value='<%# Eval("IdInBBs") %>' runat="server" />选择&nbsp; 
</ItemTemplate>

<script type ="text/javascript">
 function checkAll(checkObj)
 {
   var hiddenObj=document.getElementById("<% =checkedIDs.ClientID %>");
   if(checkObj.checked)
   {
     hiddenObj.value+=","+checkObj.value;
   }
   else
   {
     hiddenObj.value = hiddenObj.value.replace(","+checkObj.value,"");
   }
    
 }
</script>

   [后台主要代码]
   

protected void bbsArticleGv_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
           // string[] idArray = checkedIDs.Value.Split(new char[] { ','});
            string idString = checkedIDs.Value;
            HtmlInputCheckBox checkBox = (HtmlInputCheckBox)e.Row.FindControl("Checkbox2");
            if (checkBox != null)
            {
                if (idString.IndexOf(checkBox.Value) > 0)
                {
                    checkBox.Checked = true;
                }
               
            }

        }
    }

 取值:

string[] idArray = checkedIDs.Value.Split(new char[] { ',' });