ASP.NET-如何一次选中网格视图页面中的所有复选框，并跨页面访问网格视图中的选中行

我有一个网格视图，它允许您下载所检查行的文件。它将这些文件下载到一个.zip文件中。除了两件事之外，一切都很好：

1. 如果我选择"全选"，它只会在网格视图的第一页中全选。如果有足够的数据可以有多个页面，我该如何使其成为选中全部实际上选择全部
2. 如果我在不同的页面上选中了复选框，然后单击了一个应该下载所有文件的按钮，它只下载我当前查看的页面的文件。因此，如果我正在查看gridview第2页，并且我下载了选中的行，它将只下载我在第2页中选中的文件——即使我在第1页中选中了框

这是我的代码：

复选框和网格视图：

 private void RemoveRowIndex(int index)
        {
            SelectedShotIndex.Remove(index);
        }
        private void PersistRowIndex(int index)
        {
            if (!SelectedShotIndex.Exists(i => i == index))
            {
                SelectedShotIndex.Add(index);
            }
        }
        private List<Int32> SelectedShotIndex
        {
            get
            {
                if (ViewState[SELECTED_SHOT_INDEX] == null)
                {
                    ViewState[SELECTED_SHOT_INDEX] = new List<Int32>();
                }
                return (List<Int32>)ViewState[SELECTED_SHOT_INDEX];
            }
        }
        private void RePopulateCheckBoxes()
        {
            foreach (GridViewRow row in gvSearchResultsUserAdmin.Rows)
            {
                var chkBox = row.FindControl("chkShot") as System.Web.UI.WebControls.CheckBox;
                IDataItemContainer container = (IDataItemContainer)chkBox.NamingContainer;
                if (SelectedShotIndex != null)
                {
                    if (SelectedShotIndex.Exists(i => i == container.DataItemIndex))
                    {
                        chkBox.Checked = true;
                    }
                }
            }
        }
        protected void gvSearchResultsUserAdmin_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            gvSearchResultsUserAdmin.PageIndex = e.NewPageIndex;
            if (Session["gvSearchResultsUserAdmin"] != null)
            {
                gvSearchResultsUserAdmin.DataSource = Session["gvSearchResultsUserAdmin"];
            }
            else
            {
                //gvSearchResultsUserAdmin.DataSource = ds;
            }
            foreach (GridViewRow row in gvSearchResultsUserAdmin.Rows)
            {
                var chkBox = row.FindControl("chkShot") as System.Web.UI.WebControls.CheckBox;
                IDataItemContainer container = (IDataItemContainer)chkBox.NamingContainer;
                if (chkBox.Checked)
                {
                    PersistRowIndex(container.DataItemIndex);
                }
                else
                {
                    RemoveRowIndex(container.DataItemIndex);
                }
            }
            LoadGridView();
            //gvSearchResultsUserAdmin.DataBind();
            RePopulateCheckBoxes(); 
        }

全选复选框：

 protected void chkboxSelectAll_CheckedChanged(object sender, EventArgs e)
        {
            try
            {
                System.Web.UI.WebControls.CheckBox ChkBoxHeader = (System.Web.UI.WebControls.CheckBox)gvSearchResultsUserAdmin.HeaderRow.FindControl("chkboxSelectAll");
                foreach (GridViewRow row in gvSearchResultsUserAdmin.Rows)
                {
                    System.Web.UI.WebControls.CheckBox ChkBoxRows = (System.Web.UI.WebControls.CheckBox)row.FindControl("chkShot");
                    if (ChkBoxHeader.Checked == true)
                    {
                        ChkBoxRows.Checked = true;
                    }
                    else
                    {
                        ChkBoxRows.Checked = false;
                    }
                }
            }
            catch (Exception)
            {
                }
            }
        }

我的"全部下载"按钮：

    protected void btnDownloadShots_Click(object sender, EventArgs e)
    {
        using (ZipFile zip = new ZipFile())
        {
            try
            {
                foreach (GridViewRow gvrow in gvSearchResultsUserAdmin.Rows)
                {
                    System.Web.UI.WebControls.CheckBox chk = (System.Web.UI.WebControls.CheckBox)gvrow.FindControl("chkShot");
                    if (chk.Checked)
                    {
                        SqlCommand objcmd = new SqlCommand();
                        try
                        {
                            filmName = gvrow.Cells[1].Text;
                            shotNumber = int.Parse(gvrow.Cells[2].Text);
                        }
                        catch (Exception ex)
                        {
                        }
                        objcmd.CommandType = CommandType.StoredProcedure;
                        objcmd.CommandText = "ShotIDfromSearch";
                        objcmd.Parameters.AddWithValue("@filmName", filmName);
                        objcmd.Parameters.AddWithValue("@shotNumber", shotNumber);
                        ds = objdb.getDataSetUsingCmdObj(objcmd);
                        shotID = ds.Tables[0].Rows[0].Field<int>("ShotID");
                        FilePath = ReturnFilePath(shotID);
                        //Response.ForceDownload(FilePath, filmName + " - Shot " + shotNumber.ToString() + ".mp4");
                        zip.AddFile(FilePath, filmName);
                    }
                }
            }
            catch (Exception)
            {
            }

            Response.Clear();
            Response.AddHeader("Content-Disposition", "attachment; filename=Vertov.zip");
            Response.ContentType = "application/zip";
            zip.Save(Response.OutputStream);
            Response.End();
        }
    }