通过数据列表循环以获取数据

Question

我被困在转换数据列表中的速率。我的页面包含一个下拉列表（货币转换器），一个数据列表 - 里面包含标签中袋子的价格。现在我使用dropdownlist.selectedIndexchange

Protected Sub ddl_rate_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddl_rate.SelectedIndexChanged 
Dim lbl_rate As Label = roomList.Items.Item(0).FindControl("lbl_rate") 
Dim a As Integer = Convert.ToInt32(lbl_rate.Text) 
    If ddl_rate.Text = "Australia Dollars (AUD)" Then 
      Dim b As Integer = (a * 0.8029) 
      lbl_rate.Text = b.ToString() 

     ElseIf ddl_rate.Text = "Brazil Reais (BRL)" Then 
      Dim b As Integer = (a * 1.3024) 
      lbl_rate.Text = b.ToString() 
End If 

尽管它确实转换了费率，但它只转换了第一行。 有什么建议吗？

Answer 1

这是一种猜测没有看到代码的其余部分：

Protected Sub ddl_rate_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddl_rate.SelectedIndexChanged 

    foreach(c as Control in roomList.Items) 

    Dim lbl_rate As Label = c.FindControl("lbl_rate") 
    Dim a As Integer = Convert.ToInt32(lbl_rate.Text) 
    If ddl_rate.Text = "Australia Dollars (AUD)" Then 
      Dim b As Integer = (a * 0.8029) 
      lbl_rate.Text = b.ToString() 

     ElseIf ddl_rate.Text = "Brazil Reais (BRL)" Then 
      Dim b As Integer = (a * 1.3024) 
      lbl_rate.Text = b.ToString() 
    End If 
next