GridView |下拉列表无法填充

Question

单击＆＃34;更新＆＃34; FooterTemplate中的下拉列表会无法填充在某一行 这是填充时的页面加载事件：

 protected void Page_Load(object sender, EventArgs e)
    {
        DropDownList ddlImages_new = ((DropDownList)gvAdminArticleAdd.FooterRow.FindControl("ddlImages_new"));
        ddlImages_new.DataSource = GetPdfs();
        ddlImages_new.DataBind();

        DropDownList ddl_invNamesNew = ((DropDownList)gvAdminArticleAdd.FooterRow.FindControl("ddl_invNamesNew"));
        ddl_invNamesNew.DataSource = GetInvestigatorNames();
        ddl_invNamesNew.DataBind();
    }

如果我在某行上单击更新linkBut​​ton，则下拉列表中的数据将消失 即使在尝试在取消事件上调用页面加载时它也无法正常工作。

  protected void gvAdminArticleAdd_CancelEditEventHandler(object sender, GridViewCancelEditEventArgs e)
    {
        Page_Load(sender, e);
    }

Answer 1

仅在页面未回发时绑定您的控件：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DropDownList ddlImages_new = ((DropDownList)gvAdminArticleAdd.FooterRow.FindControl("ddlImages_new"));
        ddlImages_new.DataSource = GetPdfs();
        ddlImages_new.DataBind();

        DropDownList ddl_invNamesNew = ((DropDownList)gvAdminArticleAdd.FooterRow.FindControl("ddl_invNamesNew"));
        ddl_invNamesNew.DataSource = GetInvestigatorNames();
        ddl_invNamesNew.DataBind();
    }
}