c# - 如何从动态添加的标签中检索数据，在asp.net c#中动态添加的div标签中的下拉列表

Question

我在 C# 中将标签和下拉列表(不是固定数量的标签、下拉列表)动态添加到 ASP.NET 页面上的表单，如何在回发页面后从这些控件中读回数据？

代码:-

for (int newNames = 0; newNames < dtDDLBindName.Rows.Count; newNames++)
        {

            System.Web.UI.HtmlControls.HtmlGenericControl divMapClient = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
            divMapClient.ID = 100 + "divMapClient" + newNames;
            divMapClient.Attributes.Add("class", "row");
            divMapClient.Attributes.Add("runat", "server");


            System.Web.UI.HtmlControls.HtmlGenericControl divNewClients = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
            divNewClients.ID = 100 + "divNewClients" + newNames;
            divNewClients.Attributes.Add("runat", "server");
            divNewClients.Attributes.Add("class", "col-sm-6");

            Label lblNewClientName = new Label();
            lblNewClientName.ID = "lblNewClientName" + newNames;
            lblNewClientName.Attributes.Add("runat", "server");
            lblNewClientName.Text = dtDDLBindName.Rows[newNames]["Investor Name"].ToString();


            divNewClients.Controls.Add(lblNewClientName);

            Label lblNewClientID = new Label();
            lblNewClientID.ID = "lblNewClientID" + newNames;
            lblNewClientID.Attributes.Add("runat", "server");
            lblNewClientID.Style.Add("display", "none");
            lblNewClientID.Text = dtDDLBindName.Rows[newNames]["Investor Id"].ToString();


            divNewClients.Controls.Add(lblNewClientID);

            divMapClient.Controls.Add(divNewClients);

            divmain.Controls.Add(divMapClient);

            System.Web.UI.HtmlControls.HtmlGenericControl br = new System.Web.UI.HtmlControls.HtmlGenericControl("br");
            divmain.Controls.Add(br);

        }

Answer 1

您可以使用 Control.FindControl将控件的 id 作为字符串并在此控件中查找。

Label l = (Label)ContainerControl.FindControl("ID");

您可以将 id 分配给控件，这样您就可以创建这些控件的 id。例如，您创建 ID 为 lbl1、lbl2 的标签，然后您可以使用循环获取所有标签。

for(int i=0 i < lablesCount; i++)
{
  Label l = (Label)ContainerControl.FindControl("lbl" + i);
  //Your processing goes here
}