后台生成控件后，取不到值

vivian_lanlan 2010-05-12 01:43:18

----生成控件
TableRow row = new TableRow();
TableCell cell = new TableCell();

TextBox tebox = new TextBox();
tebox.ID = "txtid001";
tebox.Text = "已找到值";
cell.Controls.Add(tebox);
row.Cells.Add(cell);
this.Table1.Rows.Add(row);
--取值
TextBox te = (TextBox)this.FindControl("txtid001");

Response.Write(te.Text);--这里发生错误，空异常

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vivian_lanlan 2010-05-12

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default5.aspx.cs" Inherits="Default5" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Table ID="Table1" runat="server">
</asp:Table>
<asp:Button runat="server" ID="btn1" Text="测试" OnClick="btn1_Click" />
</div>
</form>
</body>
</html>

protected void Page_Load(object sender, EventArgs e)
{
//if (!IsPostBack)
//{
TableRow row = new TableRow();
TableCell cell = new TableCell();

TextBox tebox = new TextBox();
tebox.ID = "txtid001";
tebox.Text = "已找到值";

DropDownList dl = new DropDownList();
dl.Items.Add(new ListItem("1", "1"));
dl.Items.Add(new ListItem("2", "2"));
dl.Items.Add(new ListItem("3", "3"));
cell.Controls.Add(dl);
cell.Controls.Add(tebox);
row.Cells.Add(cell);

this.Table1.Rows.Add(row);
//}
}
protected void btn1_Click(object sender, EventArgs e)
{
TextBox te = (TextBox)this.FindControl("txtid001");
DropDownList dl = (DropDownList)this.FindControl("dl");
Response.Write(dl.SelectedValue);
//Response.Write("取值：" + Request["txtid001"].ToString());
//Response.Write("下拉框：" + Request["dl"].ToString());
//Response.Write(te.Text);
}

jzcldy 2010-05-12

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lz 是你自己哪里写错了吧你的代码没错啊

<body>

    <form id="form1" runat="server">

    <div>

    <asp:Table ID="Table1" runat="server" ></asp:Table>

    </div>

    <asp:Button ID="bt" runat="server" Text="sumbit" onclick="bt_Click" />

    </form>

</body>



public partial class sounds_Default2 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

          TableRow row = new TableRow();

  TableCell cell = new TableCell();

    



  TextBox tebox = new TextBox();

  tebox.ID = "txtid001";

  tebox.Text = "已找到值";

  cell.Controls.Add(tebox);

  row.Cells.Add(cell);

  this.Table1.Rows.Add(row);

 



    }

    protected void bt_Click(object sender, EventArgs e)

    {

  TextBox te = (TextBox)this.FindControl("txtid001");



  Response.Write(te.Text); 

    }

}