通過數據列表循環以獲取數據

Question

我被困在轉換數據列表中的速率。我的頁面包含一個下拉列表（貨幣轉換器），一個數據列表 - 裏面包含標籤中袋子的價格。現在我使用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 

儘管它確實轉換了費率，但它只轉換了第一行。 有什麼建議嗎？

Answer 1

這是一種猜測沒有看到代碼的其餘部分：

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