在GridView上分页

Question

我现在停留在如何在另一页上显示网格数据的问题上。

基本上，我有一个启用了Paging的GridView名称“ gdvRiders”。 问题是，当我单击页面2时，我得到了一个没有数据的空白页面。 有人能帮我吗？ 我开始学习C＃

这是我的代码：

protected void Page_Load(object sender, EventArgs e)
    {
        DataBase db = new DataBase(true);
        string strSQL;
        DataTable dt;

        if (!IsPostBack)
        {
            strSQL = "SELECT r.surname, r.firstname, cn.country, r.age, f.flagurl " +
                     "FROM (Riders r INNER JOIN par_CountryNation cn ON r.countryid = cn.countryid) INNER JOIN par_Flags f ON cn.flagid = f.flagid ";

            dt = db.getDataTableAc(strSQL, "list_Riders");

            gdvRiders.DataSource = dt;
            gdvRiders.DataBind();

        }

    }

    protected void gdvRiders_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
            gdvRiders.PageIndex = e.NewPageIndex;
            gdvRiders.DataBind();

    }
}

Answer 1

您需要将数据关联到网格的数据源 。 You should put the code to bind the gridview in separate function and call it from page_load and PageIndexChanging.

protected void gdvRiders_PageIndexChanging(object sender, GridViewPageEventArgs e)
{             
       strSQL = "SELECT r.surname, r.firstname, cn.country, r.age, f.flagurl " +
                 "FROM (Riders r INNER JOIN par_CountryNation cn ON r.countryid = cn.countryid) INNER JOIN par_Flags f ON cn.flagid = f.flagid ";
        dt = db.getDataTableAc(strSQL, "list_Riders");
        gdvRiders.PageIndex = e.NewPageIndex;
        gdvRiders.DataSource = dt; 
        gdvRiders.DataBind();

}