Question

I want to create dynamic text box when user click on Add more link button. For this I am using this code. And I have to mention that I am using master page.

  protected void lnkAddMore_Click(object sender, EventArgs e)
  {
        if (Request.Cookies["value"] != null)
        {
              i = Convert.ToInt32(Request.Cookies["value"].Value) + 1 ;
        }
        for (int k = 1; k <= i; k++)
        {
              LiteralControl literal = new LiteralControl();
              literal.Text = "<br /><br />";
              Label newLabel = new Label();
              newLabel.Text = "Choice" + " " + k.ToString();
              newLabel.ID = "lblChoice_" + k.ToString();
              newLabel.Attributes.Add("runat", "Server");
              this.panelLabel.Controls.Add(newLabel);
              this.panelLabel.Controls.Add(literal);

              LiteralControl literal1 = new LiteralControl();
              literal1.Text = "<br /><br />";
              TextBox nexText = new TextBox();
              nexText.ID = "txtChoice_" + k.ToString();
              nexText.Attributes.Add("TextMode", "MultiLine");
              nexText.Attributes.Add("runat", "Server");
              panelTextbox.Controls.Add(nexText);
              this.panelTextbox.Controls.Add(literal1);

              Response.Cookies["value"].Value = i.ToString();
              Session["Panel"] = panelTextbox;
        }
  }



  protected void Page_Load(object sender, EventArgs e)
  {
        if (!IsPostBack)
        {
           if (Session["Panel"] != null)
                    {
                          ContentPlaceHolder content=new ContentPlaceHolder();
                          content.Controls.Add(Session["Panel"] as Panel);
                    }
        }
  }

现在,在点击提交纽顿之后,我正面临如何检索这些文本箱数据的问题,以便我能够把文本箱的数值储存到数据库。

为点击 b而写的代码 Save

  protected void btnSave_Click(object sender, EventArgs e)
  {
     if (Session["Panel"] != null)
        {
              ContentPlaceHolder content_new = new ContentPlaceHolder();
              for (int i = 1; i <= count; i++)
              {
                    strControlName = "txtChoice_" + i.ToString();

                    TextBox objTextBox =              (TextBox)content_new.FindControl(strControlName);

                    strTextBoxValues[i] = objTextBox.Text;
                    string str3 = strTextBoxValues[2];
              }
        }
  }

这部法典显示了 ob粒的错误。错误是NullReferenceException。

• 如何写存储程序以保存上述代码的数据?

主要问题是处理参数申报,如何宣布通过价值的动态参数,从而节省动态案文箱的价值?

感谢。

Answer 1

我已经在这里回答了这个问题。

https://stackoverflow.com/questions/17290463/lost-dynamically-created-text- Box- Values/17290843#17290843>

你可以尝试这样做。

private string GetValue(string ControlID)
{
   string[] keys = Request.Form.AllKeys;
   string value = string.Empty;
   foreach (string key in keys)
   {
     if (key.IndexOf(ControlID) >= 0)
     {
         value = Request.Form[key].ToString();
         break;
     }
   }

   return value;
}

Then to get the value

string txtChoice1value = GetValue("txtChoice1");

Answer 2

First of all when you dynamically create a control it doesn t need to be set "runat = sever". Problem is in this line `ContentPlaceHolder content_new = new ContentPlaceHolder();` you make a new ContentPlaceHolder, this mean it doesn t have any control to be found.

查阅网页:)上动态地建立文本Box控制

Answer 3

You need to find the reference of your already created ContentPlaceHolder like-

ContentPlaceHolder cnt =(ContentPlaceHolder)this.Master.FindControl("ContentPlaceHolder1");

之后添加动态生成的<代码>Control,载于ContentPlaceHolder。

cnt.Controls.Add(Session["Panel"] as Panel);

为什么要创建新的<条码>。内容提要每次都提到你正在使用主人页: 1

Answer 4

背后控制器在以下网址上持续:

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