动态创建的控件事件处理程序未触发

Question

动态创建的控件事件处理程序未触发

.netasp.netevents

9

我有一个动态创建的文本框的问题。

当文本框在PageLoad中被创建时，它的TextChanged事件被触发。
但是当我动态删除并重新创建文本框时，TextChanged事件没有被触发。

这是代码:

.aspx文件

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

    <asp:Table ID="Table1" runat="server">
      <asp:TableRow>
        <asp:TableCell ColumnSpan="2">Fixed content</asp:TableCell>
      </asp:TableRow>
    </asp:Table>   
    </form>
</body>

.cs file

public partial class test : System.Web.UI.Page
{
  string myText = "a";

  protected void Page_Load(object sender, EventArgs e)
  {
    WriteRows();
  }

  private void WriteRows()
  {
    TableRow tr = new TableRow();

    TableCell tc = new TableCell();
    TextBox txt = new TextBox();
    txt.Text = myText;
    txt.TextChanged += new EventHandler(txt_TextChanged); // Assign event handler
    tc.Controls.Add(txt);
    tr.Controls.Add(tc);

    tc = new TableCell();
    tc.Text = txt.Text;
    tr.Controls.Add(tc);

    Table1.Controls.AddAt(1, tr);
  }

  private void txt_TextChanged(object sender, EventArgs e)
  {
    myText = ((TextBox)sender).Text;
    RedrawTable(); // Delete the row (incl. the TextBox) and rewrite it
  }

  private void RedrawTable()
  {
    Table1.Controls.RemoveAt(1);
    WriteRows();
  }
}

有没有解决方案可以使事件始终被触发？

- Aximili

你解决了你的问题吗？我也遇到了动态创建的ASP按钮相同的问题。我给按钮设置了ID，但是没有任何结果。 - Nurlan

11个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- mojam · Answer 1

以下是您的答案及完整代码：

string myText = "a";

protected void Page_Load(object sender, EventArgs e)
{
    WriteRows();
}

private void WriteRows()
{
    TableRow tr = new TableRow();

    TableCell tc = new TableCell();
    TextBox txt = new TextBox();
    txt.Text = myText;

    txt.ID = "txt1";

    txt.TextChanged += new EventHandler(txt_TextChanged); // Assign event handler

    txt.AutoPostBack = true;

    tc.Controls.Add(txt);
    tr.Controls.Add(tc);

    tc = new TableCell();
    tc.Text = txt.Text;
    tr.Controls.Add(tc);

   Table1.Controls.AddAt(0,tr);

}

private void txt_TextChanged(object sender, EventArgs e)
{
    myText = ((TextBox)sender).Text;
    RedrawTable(); // Delete the row (incl. the TextBox) and rewrite it
}

private void RedrawTable()
{
    Table1.Controls.RemoveAt(0);
    WriteRows();
}