按钮控制未触发

Question

我遇到的问题有点复杂，所以请耐心等待。我有2个按钮控件。在页面加载中，我想知道哪个按钮在页面加载时创建了回发。通过研究我发现下面的这个片段，它按预期工作。所以这是我点击按钮时发生的事件的情景。

   1. Click the button does a postback
   2. Runs the function below and tell me the id of the button
   3. Runs the clicked event handlers for that button

     Protected Sub btnCalc_Click(ByVal sender As Object, ByVal e As EventArgs) Handles  btnCalc.Click
          ' Do this
     End Sub

当我点击第二个按钮时出现问题，它执行步骤1和步骤2，但从未进行过3.通过测试，我认为在点击的第一个按钮上它只执行1,2和3。我不知道为什么会发生这种情况？

     Function GetPostBackControlName() As String

      Dim control As Control = Nothing
      Dim ctrlname As String = Page.Request.Params("__EVENTTARGET")

    If ctrlname <> Nothing AndAlso ctrlname <> [String].Empty Then
        control = Page.FindControl(ctrlname)
    Else
        Dim ctrlStr As String = [String].Empty
        Dim c As Control = Nothing

        For Each ctl As String In Page.Request.Form

            c = Page.FindControl(ctl) 

           If TypeOf c Is System.Web.UI.WebControls.Button Then
                control = c
                Exit For
           End If

        Next

    End If

    Try
        Return control.ID.ToString
    Catch
        Return ""
    End Try

    End Function