通过PANEL动态添加TEXT和DropDownList，无法获取值！

[westhdd]

<asp:Panel ID="Panel2" runat="server">
        
            <center>
                <b>添加非法信息</b>
                <div style="width:600px;">
                    非法信息名称:<asp:TextBox ID="txterrname" runat="server" Width="350"></asp:TextBox> <br />
                    <div>   

             <div >

                 请输入非法信息记录行数:

                 <asp:TextBox runat="server"  ID="txtTextCount"></asp:TextBox>

            

                 <asp:RegularExpressionValidator ID="RegularExpressionValidator1" ControlToValidate="txtTextCount" ValidationGroup="CreateTextBox" Display="Dynamic" 

                     runat="server" ErrorMessage="只接受数字!" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>  

                 <asp:Button runat="server" ID="btnCreate" Text="创建记录非法信息记录行数" ValidationGroup="CreateTextBox"

                     onclick="btnCreate_Click" />  

             </div>

             <div runat="server" id="divControls" > </div> 
                        
             <div runat="server" id="divMessage"> </div>
                        <asp:Panel ID="Panel4" runat="server">
                        </asp:Panel>
         </div>                    
                                  
                </div>
                
                <asp:Button ID="btninsert" runat="server" Text="确认添加" 
                    onclick="btninsert_Click" />
            </center>
        
        </asp:Panel>

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.UI.HtmlControls;
using System.Text;

public partial class Error_ManagerError : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {            
                    }
       
    }
       protected void btnadd_Click(object sender, EventArgs e)
    {
        if (this.txtaddtype.Text.Length < 1)
        {
            ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('对不起,非法信息类型不能为空！');</script>");
            return;
        }
        using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalServer"].ConnectionString))
        {
            using (SqlCommand cmd = new SqlCommand("insert into errorinfo(name) values(@name)", cn))
            {
                cmd.Parameters.AddWithValue("@name", this.txtaddtype.Text);
                int rows = -1;
                try
                {
                    cn.Open();
                    rows = cmd.ExecuteNonQuery();
                    if (rows > 0)
                    {
                        ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('恭喜你,非法信息类型添加成功！');</script>");
                        this.txtaddtype.Text = string.Empty;
                        return;
                    }
                }
                catch (Exception)
                {

                    throw;
                }
            }
        }
    }

    private DataSet GetErrorInfo()
    {
        using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalServer"].ConnectionString))
        {
            using (SqlDataAdapter cmd = new SqlDataAdapter("select * from errorinfo", cn))
            {
                DataSet ds = new DataSet();
                try
                {
                    cn.Open();
                    cmd.Fill(ds);


                }
                catch (Exception ex)
                {
                    cn.Close();
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
    }
    private void CreateTextBoxLis(int num)
  {
      Panel p;
      TextBox t;
      Label l;
      DropDownList dr;
      for (int i =0; i < num; i++)
      {
          //创建Panel
          p = new Panel();
          p.ID = "ptxt" + i.ToString();

          //创建Lable
          l = new Label();
          l.ID = "lable" + i.ToString();
          l.Text = "详细信息" + i.ToString();

          //创建TextBox
          t = new TextBox();
          t.ID = "t" + i.ToString();
          Page.Form.Controls.Add(t);
          t.Attributes.Add("runat", "server");

          //创建DropDownList控件
          dr = new DropDownList();
          dr.ID = "dr" + i.ToString();
          dr.Attributes.Add("runat", "server");
          dr.DataSource = GetErrorInfo();
          dr.DataTextField = "name";
          dr.DataValueField = "id";
          dr.DataBind();

         Panel4.Controls.Add(p);
          Panel4.Controls.Add(l);
         Panel4.Controls.Add(t);
         
         Panel4.Controls.Add(dr);

      }
  }




    protected void btnCreate_Click(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {



            if (txtTextCount.Text == null || string.IsNullOrEmpty(txtTextCount.Text))
            {
                ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('很抱歉，你输错了！');</script>");
                return;
            }
            int txtCount = int.Parse(txtTextCount.Text);

            // 注意：每次PostBack时，都需要重新动态创建TextBox 
            
                CreateTextBoxLis(txtCount);
          

            
        }
        
    }
    protected void btninsert_Click(object sender, EventArgs e)
    {

       
            AddError();
       
       
    }
    private void AddError()
    {
        TextBox txt;
        DropDownList dr;
        
        using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalServer"].ConnectionString))
        {
            using (SqlCommand cmd = new SqlCommand("insert into error(nickname,website,eid) values(@name,@website,@eid)", cn))
            {
                cmd.Parameters.AddWithValue("@name", this.txterrname.Text);
              
                int f =int.Parse(this.txtTextCount.Text);
                for (int i = 0; i < f; i++)
                {
                    txt=this.Panel4.FindControl("t"+i.ToString())as TextBox;
                    dr=this.Panel4.FindControl("t"+i.ToString())as DropDownList;
                    //Response.Write(((TextBox)this.FindControl("t" + i.ToString())).Text);
                    cmd.Parameters.AddWithValue("@website", txt.Text);
                    cmd.Parameters.AddWithValue("eid",dr.SelectedValue );
                    
                }
                int rows = -1;
                try
                {
                    cn.Open();
                    rows = cmd.ExecuteNonQuery();
                    if (rows > 0)
                    {
                        Response.Write("<script>alert('添加成功')</script>");
                    }
                    else
                        Response.Write("<scirpt>alert('添加失败')</script>");
                }
                catch (Exception)
                {
                    cn.Close();
                    throw;
                }

            }
        }
    }
    protected void btnseach_Click(object sender, EventArgs e)
    {
        Panel1.Visible = false;
        Panel2.Visible = false;
        Panel3.Visible = true;
        txtseach.Text = string.Empty;
    }
    private void GetShowError()
    {
        using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalServer"].ConnectionString))
        {
            using (SqlCommand cmd = new SqlCommand("select error.id,nickname,website,name,state from errorinfo inner join error on errorinfo.id=error.eid", cn))
            {
                
                try
                {
                    cn.Open();
                    GridView1.DataSource = cmd.ExecuteReader();
                    GridView1.DataBind();
                }
                catch (Exception)
                {
                    cn.Open();
                    throw;
                }
              
            }
        }
    }
    private void GetShowErrorByName(string name)
    {

        using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalServer"].ConnectionString))
        {
            using (SqlCommand cmd = new SqlCommand("select error.id,website,errorinfo.name as name,state,nickname from error inner join errorinfo on error.eid=errorinfo.id where nickname LIKE '%' + @no + '%' or website LIKE '%' + @url + '%'", cn))
            {
                cmd.Parameters.AddWithValue("@no", name);
                cmd.Parameters.AddWithValue("@url", name);
                try
                {
                    cn.Open();
                    GridView1.DataSource = cmd.ExecuteReader();
                    GridView1.DataBind();
                }
                catch (Exception ex)
                {
                    cn.Close();
                    throw new Exception(ex.Message);
                }
            }
        }
    }

    protected void brnseach_Click(object sender, EventArgs e)
    {
         if (this.txtseach.Text != null)
        {
            GetShowErrorByName(this.txtseach.Text);
        }
        else
        {
            GetShowError();
        }
    }
    
}

[saishangpeiqian]

还是调试一下，太长了

[jerry_zuo]

LZ 这家伙 也太长了 ，看的累~~~

调试嘛。调试能解决的就不是问题了。

[feixian49]

看看这个帖子：
http://topic.csdn.net/u/20090914/13/7b89058d-8d85-45e8-8d71-4e0fc513d1d2.html

[wuyq11]

TxtBox txt=this.Panel1.FindControl("TextBox1") as TextBox;
DropDownList ddl=this.Panel1.FindControl("DropDownList1") as DropDownList;

[mainbob]

我也遇到同样的问题,msg是panel外label控件
msg.Text = (this.InputPanel.FindControl("model") as dropdownlist).SelectItems.Text;
总是取不到panel中dropdownlist控件model的值，哪位高人来帮忙指点一下，谢谢啦

[westhdd]

楼上，我就是用你的那个方法找的，在我第二次提交的时候页面的控件还在，没有值

[victarary]

[Quote=引用 5 楼 westhdd 的回复:]
protected void btnCreate_Click(object sender, EventArgs e)
{

if (!IsPostBack)
{



if (txtTextCount.Text == null || string.IsNullOrEmpty(txtTextCount.Text))
{
ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('很抱歉，你输错了！');</script>");
return;
}
int txtCount = int.Parse(txtTextCount.Text);

// 注意：每次PostBack时，都需要重新动态创建TextBox

CreateTextBoxLis(txtCount);



}

}
[/Quote]
你在这个函数只会在点了按钮后才执行，那么页面一旦刷新又没有点按钮，Panel就没有加入控件，在后面AddError也就找不到了

[sxmonsy]

真长。。。。