从动态添加的文本框asp.net c中获取值#

你快到了。

问题

您需要在回邮时重新加载那些动态创建的文本框。否则,它们将变为空,您将无法找到它。

为了做到这一点,您需要将这些动态文本框ID保存在持久位置,如视图状态或会话状态。

屏幕截图

ASPX公司

Number of TextBoxes: <asp:TextBox runat="server" ID="CounterTextBox" 
    OnTextChanged="CounterTextBox_TextChanged" AutoPostBack="True" /><br/>
<asp:PlaceHolder runat="server" ID="TextBoxPlaceHolder" /><br/>
<asp:Button runat="server" ID="ConfirmButton" Text="Confirm" 
    OnClick="ConfirmButton_Click" /><br/>
Result: <asp:Literal runat="server" ID="ResultLiteral"/>

代码隐藏

private List<string> TextBoxIdCollection
{
    get
    {
        var collection = ViewState["TextBoxIdCollection"] as List<string>;
        return collection ?? new List<string>();
    }
    set { ViewState["TextBoxIdCollection"] = value; }
}

protected void Page_Load(object sender, EventArgs e)
{
    foreach (string textboxId in TextBoxIdCollection)
    {
        var textbox = new TextBox {ID = textboxId};
        TextBoxPlaceHolder.Controls.Add(textbox);
    }
}

protected void CounterTextBox_TextChanged(object sender, EventArgs e)
{
    var collection = new List<string>();
    int total;
    if (Int32.TryParse(CounterTextBox.Text, out total))
    {
        for (int i = 1; i <= total; i++)
        {
            var textbox = new TextBox { ID = "QuestionTextBox" + i };
            // Collect this textbox id
            collection.Add(textbox.ID); 
            TextBoxPlaceHolder.Controls.Add(textbox);
        }
        TextBoxIdCollection= collection;
    }
}

protected void ConfirmButton_Click(object sender, EventArgs e)
{
    foreach (Control ctr in TextBoxPlaceHolder.Controls)
    {
        if (ctr is TextBox)
        {
            string value = ((TextBox)ctr).Text;
            ResultLiteral.Text += value;
        }
    }
}

实际上,您正在创建文本框,属性Text设置为默认值=“”;因此,您需要设置txt.Text属性,例如:

    public void txtExtra_TextChanged(object sender, EventArgs e)
    {
        for (int a = 1; a <= int.Parse(txtExtra.Text); a++)
        {
            TextBox txt = new TextBox();
            txt.ID = "txtquestion" + a;
            txt.Text = "Some text"; // Set some text here
            pholder.Controls.Add(txt);

        }
    }

编辑:

之后,您可以将值存储到列表中:

private static List<string> values = new List<string>();

    protected void btnConfirm_Click(object sender, EventArgs e)
    {
        foreach (Control ctr in pholder.Controls)
        {
            if (ctr is TextBox)
            {
                string value = ((TextBox)ctr).Text;
                values.Add(value); // add values here
            }
        }
    }

编辑: 以下是您的价值观:

编辑: 为了更好地理解超级巨: 再创建一个文本框 txtOutput 然后添加按钮 GetDataFromTextBoxesAndPutItBelow 并为该按钮“Click”创建一个事件。事件代码:

    protected void btnGetData_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < values.Count; i++)
            txtOutput.Text += "Value from txtquestion1: " + values[i] + " ";
    }

屏幕截图外观:

for (int i = 0; i < dataTable.Rows.Count; i++)
{

    int comment_id = Convert.ToInt32(dataTable.Rows[i]["comment_id"]);
    string created_by_name = dataTable.Rows[i]["created_by_name"].ToString();
    string created_at = dataTable.Rows[i]["created_at"].ToString();
    string comment = dataTable.Rows[i]["comment"].ToString();

    HtmlGenericControl divComment = new HtmlGenericControl("div"); //This is root object of comment.Other objects like textbox,button,etc added into this object.
    //divComment.Attributes.Add("class", "div_post_display");
    divComment.Attributes.Add("id", comment_id.ToString());

    /* Comment by */
    HtmlGenericControl lblCommentBy = new HtmlGenericControl("label");
    //lblCommentBy.Attributes.Add("class", "divauthor");
    lblCommentBy.InnerText = "" + created_by_name + " (" + created_at + ")";

    /* Comment body */
    HtmlGenericControl pComment = new HtmlGenericControl("p");
    //lblCommentBy.Attributes.Add("class", "divauthor");
    pComment.InnerText = comment;

    divComment.Controls.Add(lblCommentBy);
    divComment.Controls.Add(pComment);

    if (Session["user_id"] != null)
    {
        if (Session["user_level"].ToString() == "1") //Admin can reply for comment
        {
            /* Reply Form */
            TextBox txtReply = new TextBox(); //Create object dynamacaly
            txtReply.ID = "txtReply_"+comment_id;
            txtReply.Attributes.Add("class", "form-control"); //Add css class
            txtReply.Width = 400;
            divComment.Controls.Add(txtReply); //Add obj to root object(div)

            Button btnReply = new Button(); //Create object dynamacaly
            btnReply.Text = "Reply"; //Set button text 
            btnReply.Attributes.Add("class", "btn btn-sm btn-success"); //Add css class
            btnReply.Click += btnReply_Click;
            btnReply.CommandArgument = comment_id.ToString();
            divComment.Controls.Add(btnReply); //Add obj to root object(div)

            HtmlGenericControl br = new HtmlGenericControl("br"); //Create object dynamacaly
            divComment.Controls.Add(br); //new line
        }
    }
    pnlShowComments.Controls.Add(divComment);

}