一个很好的反选的例子

Html文件内容:

<script language="javascript">
            function fun_option(obj)
            {
                document.Form1.hiduserid.value=obj.value;
            }            
            function chkAll_true()
            {
                var chkall= document.all["chkAll"];
                var chkother= document.getElementsByTagName("input");
                for (var i=0;i<chkother.length;i++)
                {
                    if( chkother[i].type=='checkbox')
                    {
                        if(chkother[i].id.indexOf('chkExport')>-1)
                        {
                            if(chkall.checked==true)
                            {
                                chkother[i].checked=true;
                            }
                            else
                            {
                                chkother[i].checked=false;
                            }
                        }
                    }
                }
            }
            
            function Delete()
            {
                var  al = new Array();
                var chkother= document.getElementsByTagName("input");
                for(var i=0,j=0;i<chkother.length;i++)
                {
                    if( chkother[i].type =='checkbox')
                    {
                        if(chkother[i].id.indexOf('chkExport')>-1)
                        {
                            if(chkother[i].checked==true)
                            {
                                al[j] =chkother[i].value;
                                j++;
                            }
                        }
                    }
                }
                if (al == "")
                {
                    alert('You need to select a row in the list before selecting Delete.\r\nPlease select a row and try again.');
                }
                else if (window.confirm("Are you sure to delete all these?"))
                {
                    var deleteID='<%=btndelete.ClientID%>';
                    window.document.all(deleteID).click();
                }
                event.cancelPostBack=true;                
            }
        </script>

下面显示的全先和删除文件
全选/取消

<INPUT id="chkAll" onclick="chkAll_true()" type="checkbox">全选/取消<asp:button id="btndelete" runat="server" Text="删除"></asp:button>

DataGrid中的反选列

                                <asp:TemplateColumn>
                                    <HeaderStyle Width="10px"></HeaderStyle>
                                    <ItemTemplate>
                                        <asp:CheckBox id="chkExport" Runat="server"></asp:CheckBox>
                                    </ItemTemplate>
                                </asp:TemplateColumn>

后台CS 文件中的内容:

btndelete_Click#region btndelete_Click
        private void btndelete_Click(object sender, System.EventArgs e)
        {
            StringBuilder s=new StringBuilder();
            foreach(DataGridItem di in DataGrid1.Items) 
            { 
　                if(((CheckBox)(di.FindControl("chkExport"))).Checked==true) 
　                { 
　　                s.Append(",").Append(DataGrid1.DataKeys[di.ItemIndex].ToString());
　                } 
            } 
            if(s.ToString().StartsWith(",")==true)
            {
                delete(s.ToString().Substring(1,s.ToString().Length-1));
            }
        }
        #endregion

        delete#region delete
        private void delete(string id)
        {
            SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]);
            string sql=@"declare @sql nvarchar(400)
                        set @sql = 'delete from testgrid where UserID in('+@UserID+')'
                        exec( @sql)";
            SqlCommand comm=new SqlCommand(sql,conn);
            SqlParameter parm1=new SqlParameter("@UserID",SqlDbType.VarChar,200);
            parm1.Value=id;
            comm.Parameters.Add(parm1);
            conn.Open();
            comm.ExecuteNonQuery();
            conn.Close();
            DataBind();
        }
        #endregion