转发器中的分页

Question

我正在尝试为网站创建分页。 但是，每当我单击指示服务器转到下一页的按钮时，它仍将加载相同的页面（例如，从第1页到第2页），但它从第2页开始正常工作，显示错误的页码页面标签（例如pagelabel = 3，currentpage = 2）。 还有一个问题是没有到达最后一页，因为页面似乎没有从第1页开始，但是当我继续点击page_back_button时，它将继续显示最后一页。 我在找到这个问题的根源时遇到了麻烦。这是我创建的源代码。

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        LoadPageSizer();
        LeadStatusDDL();
        Session["curr_page"] = 1;
    }

    rptLeadsPager.DataSource = ListLeads(ddlLStatus.Text.ToString(), Convert.ToInt16(Session["curr_page"]), Convert.ToInt16(ddlPageSize.Text));
    rptLeadsPager.DataBind();

    BuildPagination(Convert.ToInt16(Session["total_page"]), Convert.ToInt16(Session["curr_page"]), 10);
}

#region DDL List for Results/Page
private void LoadPageSizer()
{
    ddlPageSize.Items.Add("10");
    ddlPageSize.Items.Add("15");
    ddlPageSize.Items.Add("20");
    ddlPageSize.Items.Add("25");
    ddlPageSize.Items.Add("30");
    ddlPageSize.Items.Add("40");
    ddlPageSize.Items.Add("50");
}
#endregion

#region DDL List for LeadsStatus
private void LeadStatusDDL()
{
    ddlLStatus.Items.Add(new ListItem("Not Qualified"));
    ddlLStatus.Items.Add(new ListItem("Qualified"));
}
#endregion

#region SQL Stored Procedure
private DataTable ListLeads(string leadStatus, int pageNumber, int pageSize)
{
    int searchResultsCount;
    DataSet dsSearchResults;

    using (SqlConnection sqlConnection = new SqlConnection(ConfigurationManager.AppSettings["sqlConnection"]))
    {
        using (var sqlCommand = new SqlCommand("LeadsPager", sqlConnection))
        {
            sqlCommand.CommandType = CommandType.StoredProcedure;

            //add parameters
            sqlCommand.Parameters.AddWithValue("@LeadsStatus", leadStatus);
            sqlCommand.Parameters.AddWithValue("@PageNumber", pageNumber);
            sqlCommand.Parameters.AddWithValue("@ResultsPerPage", pageSize);

            var resultsCountParam = new SqlParameter("@SearchResultsCount", SqlDbType.Int);
            resultsCountParam.Direction = ParameterDirection.Output;
            sqlCommand.Parameters.Add(resultsCountParam);

            using (var sqlDataAdapter = new SqlDataAdapter(sqlCommand))
            {
                dsSearchResults = new DataSet();
                sqlDataAdapter.Fill(dsSearchResults);

                searchResultsCount = int.Parse(resultsCountParam.Value.ToString());
            }
        }
    }

    if (searchResultsCount == 0)
    {
        ResultHeader.Visible = false;
        ResultFooter.Visible = false;
    }
    else
    {
        Session["total_page"] = GetTotalPage(pageSize, searchResultsCount);
        lblTotalPage.Text = Session["total_page"].ToString();
        ResultHeader.Visible = true;
        ResultFooter.Visible = true;
    }

    RenderToolbar();

    if (dsSearchResults.Tables.Count > 0)
        return dsSearchResults.Tables[0];
    else
        return null;
}
#endregion

#region Header Function
private void RenderToolbar()
{
    int intCurPage = Session["curr_page"] == null ? 1 : Convert.ToInt16(Session["curr_page"]);
    int intTotalPage = Session["total_page"] == null ? 1 : Convert.ToInt16(Session["total_page"]);
    btnUpPageBack.Visible = intCurPage > 1;
    btnUpPageNext.Visible = intTotalPage > intCurPage;
    lblPage.Text = Session["curr_page"] == null ? "1" : Session["curr_page"].ToString();
}
#endregion


#region Pagination
protected void BuildPagination(int PageCount, int CurrentPageIndex, int ButtonsCount)
{
    pnlPager.Controls.Clear(); //

    if (PageCount <= 1) return; // at least two pages should be there to show the pagination

    //finding the first linkbutton to be shown in the current display
    int start = CurrentPageIndex - (CurrentPageIndex % ButtonsCount);

    //finding the last linkbutton to be shown in the current display
    int end = CurrentPageIndex + (ButtonsCount - (CurrentPageIndex % ButtonsCount));

    //if the start button is more than the number of buttons. If the start button is 11 we have to show the <<First link
    if (start > ButtonsCount - 1)
    {
        pnlPager.Controls.Add(createButton("&lt;&lt;", 0));
        pnlPager.Controls.Add(createButton("..", start - 1));
    }

    int i = 0, j = 0;

    for (i = start; i < end; i++)
    {
        //LinkButton lnk;
        if (i < PageCount)
        {
            if (i + 1 == CurrentPageIndex) //if its the current page
            {
                Label lbl = new Label();
                lbl.Text = (i + 1).ToString();
                pnlPager.Controls.Add(lbl);
            }
            else
            {
                pnlPager.Controls.Add(createButton((i+1).ToString(), i));
            }
        }
        j++;
    }

    //If the total number of pages are greaer than the end page we have to show Last>> link
    if (PageCount > end)
    {
        pnlPager.Controls.Add(createButton("..", i));
        pnlPager.Controls.Add(createButton("&gt;&gt;", PageCount - 1));
    }
}

private LinkButton createButton(string title, int index)
{
    LinkButton lnk = new LinkButton();
    lnk.ID = "btnPage" + title + "_" + index.ToString();
    lnk.Text = title;
    lnk.CommandArgument = index.ToString();
    lnk.Click += new EventHandler(lnkPager_Click);
    return lnk;
}

#endregion Pagination

#region Get Total Page Function
private static string GetTotalPage(int vPageDisplay, int vTotalData)
{
    decimal dlQuot = decimal.Divide(vTotalData, vPageDisplay);
    int dlPresQuot = vTotalData / vPageDisplay;
    return (dlQuot > dlPresQuot ? dlPresQuot + 1 : dlPresQuot).ToString();
}
#endregion


#region Navigating Page with Buttons Function
protected void NextPage_Click(object sender, EventArgs e)
{
    Session["curr_page"] = Convert.ToInt16(Session["curr_page"]) + 1;
    //Converts Results/Page to INT
    ListLeads(ddlLStatus.Text.ToString(), Convert.ToInt16(Session["curr_page"]), Convert.ToInt16(ddlPageSize.Text));
}

protected void BackPage_Click(object sender, EventArgs e)
{
    Session["curr_page"] = Convert.ToInt16(Session["curr_page"]) - 1;
    ListLeads(ddlLStatus.Text.ToString(), Convert.ToInt16(Session["curr_page"]), Convert.ToInt16(ddlPageSize.Text));
}

protected void lnkPager_Click(object sender, EventArgs e) //Page index changed function
{
    LinkButton lnk = (LinkButton)sender;
    Session["curr_page"] = int.Parse(lnk.CommandArgument) + 1;
    ListLeads(ddlLStatus.Text.ToString(), Convert.ToInt16(Session["curr_page"]), Convert.ToInt16(ddlPageSize.Text));
}
#endregion

更新<！/强> 我已经解决了链接按钮的问题。

但是，有一个新问题。每当我在特定页面（例如，页码6）中并且我从每页结果下拉列表中选择（例如从20到50）时，总页面将从（例如9到3）改变。

然而！我当前所在的特定页面（页面6）超出了总页数的范围（例如，总页数= 3，我的当前页面= 6）。然后它将不显示任何内容，我必须向后单击按钮才能到达新的每页结果列表的最后一页。

我已经创建了一个代码，用于指定发生这种情况时Session [“curr_page”]的位置。但是，我无法确定将此代码放在何处，因为每当我更改每页结果下拉列表时它都不会触发。这是我制作的代码。

if (Convert.ToInt16(Session["curr_page"]) > Convert.ToInt16(Session["total_page"]))
{
    Session["curr_page"] = Session["total_page"];
}

Answer 1

问题是您没有重新绑定数据。他们第一次点击您的页面Session["curr_page"] = 1;时，您构建并设置了数据源，然后将其绑定。当用户单击“下一步”按钮，页面重新加载并且在Page_Load上，Session["curr_page"]仍然等于1时，您构建并设置数据源，然后将其绑定（因此，与初始页面加载相同的结果）

然后NextPage_Click执行，你增加Session["curr_page"]，并重建你的数据源......但是你永远不会设置和绑定它。

所以你可以这样做：

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            LoadPageSizer();
            LeadStatusDDL();
            Session["curr_page"] = 1;
            BindAndPage();
        }
    }

    private void BindAndPage()
    {
        rptLeadsPager.DataSource = ListLeads(ddlLStatus.Text.ToString(), Convert.ToInt16(Session["curr_page"]), Convert.ToInt16(ddlPageSize.Text));
        rptLeadsPager.DataBind();

        BuildPagination(Convert.ToInt16(Session["total_page"]), Convert.ToInt16(Session["curr_page"]), 10);
    }

    //other code

    protected void NextPage_Click(object sender, EventArgs e)
    {
        Session["curr_page"] = Convert.ToInt16(Session["curr_page"]) + 1;
        BindAndPage();
    }

Answer 2

您可以使用“DataTable”javascript功能来解决此问题。请参阅https://www.datatables.net/。

$(document).ready(function(){
    $('#myTable').DataTable();
});

仅在此设置您的表格ID，它会自动设置您的表格的分页，排序和过滤。

由于