Question

我有一个gridview，允许您下载所检查行的文件。它将文件下载到.zip文件中。一切都很好，除了两件事：

如果我选择“全部检查”，它只会检查gridview第一页中的所有内容。如果有足够的数据来拥有多个页面，我怎样才能使check-all实际选择ALL？
如果我在不同页面上选中了复选框，我单击了一个应该下载所有文件的按钮，它只会下载我当前正在查看的页面的文件。因此，如果我正在查看gridview第2页，并且我下载了已检查的行，它将只下载我在第2页中检查过的文件 - 即使我在第1页中选中了复选框。

这是我的代码：

复选框和Gridview：

 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(); 
        }

选中所有复选框：

 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();
        }
    }

Answer 1

最好的方法是首先将详细信息存储在缓存或其他替代存储（已检查数据）中，然后从缓存中提取详细信息以下载文件。

ASP.NET - 如何一次检查gridview页面中的所有复选框，并跨页面访问gridview中的已检查行？

1 个答案: