动态添加的文本框为空的按钮点击(Dynamically added TextBoxes empty

我在动态添加文本框，当我点击提交按钮，有一个回传，我看不到进入文本框的值，所有的都上来了emtpy。 这里的.aspx页面中... \

form id="form1" runat="server">
        <asp:PlaceHolder ID="phFormContent" runat="server">

        </asp:PlaceHolder>
        <br /><br />
        <asp:Button ID="btnAddForm" runat="server" Text="Add Form" OnClick="btnAddForm_Click" />
        <asp:Button ID="btnSubmitForms" runat="server" Text="Submit Forms" OnClick="btnSubmit_Click" />
    </form>

......这里就是我的文本框添加到窗体上点击btnAddForm ...

protected void btnAddForm_Click(object sender, EventArgs e)
        {
            // Create Labels
            Label lblName = new Label();
            lblName.Text = "NAME:";
            Label lblNumber = new Label();
            lblNumber.Text = "NUMBER:";
            Label lblAddress = new Label();
            lblAddress.Text = "ADDRESS:";
            Label lblCompany = new Label();
            lblCompany.Text = "COMPANY:";

            // Create Text Boxes
            TextBox txtName = new TextBox();
            TextBox txtNumber = new TextBox();
            TextBox txtAddress = new TextBox();
            TextBox txtCompany = new TextBox();

            // Create submit button
            Button btnSubmit = new Button();
            btnSubmit.Text = "SUBMIT";

            // Create panel and add controls
            Panel pnlForm = new Panel();
            pnlForm.Controls.Add(lblName);
            pnlForm.Controls.Add(txtName);
            pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
            pnlForm.Controls.Add(lblNumber);
            pnlForm.Controls.Add(txtNumber);
            pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
            pnlForm.Controls.Add(lblAddress);
            pnlForm.Controls.Add(txtAddress);
            pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
            pnlForm.Controls.Add(lblCompany);
            pnlForm.Controls.Add(txtCompany);
            pnlForm.Controls.Add(new LiteralControl("<hr />"));
            pnlForm.Controls.Add(new LiteralControl("<br /><br />"));
            panels.Add(pnlForm);

            foreach (Control panel in panels)
            {
                phFormContent.Controls.Add(panel);
            }
        }

...这是我如何努力，以提取每个单独的面板添加的字段...

private static void GetFormFields(Control panelControl)


   {
        ControlCollection controls = panelControl.Controls;
        foreach (Control childControl in panelControl.Controls)
        {
            if (childControl.GetType().ToString() == "System.Web.UI.WebControls.TextBox")
            {
                TextBox txt = childControl as TextBox;
                fields.Add(txt);
            }
            else
            {
                GetFormFields(childControl);
            }
        }
    }

面板和字段是静态列表，每个都包含四个字段面板。 我通过GetFormFields个别面板的参考...

private static List<Control> panels = new List<Control>();
        private static List<TextBox> fields = new List<TextBox>();

Answer 1:

尝试动态地对它们添加Page_Init事件。 通常，这将确保他们通过坚持PostBack 。 如果你不能做到这一点，你必须看看在存储手动保存其数据ViewState 。

Answer 2:

貌似没有被包含在VIEWSTATE页面的文本框，所以都失去了回发。

有一个关于在这里这种情况下会发生什么一些细节：

http://msdn.microsoft.com/en-us/library/kyt0fzt1(v=VS.71).aspx

文章来源: Dynamically added TextBoxes empty on button click