|上一頁和控制在運行時

Question

創建在運行時我添加一個文本框與

  Dim MRNCell As New TableCell 
     MRNCell.ID = "MRNCell" 
     Dim txtMRN As New TextBox 
     txtMRN.ID = "NewMRN" 
     MRNCell.Controls.Add(txtMRN) 
     MRNRow.Cells.Add(MRNCell) 

然後我試圖訪問使用|上一頁公共只讀屬性的Text屬性。以下是該物業的三個版本，其中沒有一個適用。

Public ReadOnly Property NewMRN() As String 
    Get 
     Dim NewMRNNum As TextBox = CType(Me.FindControl("NewMRN"), TextBox) 
     'NewMRNNum = Nothing 
     Return NewMRNNum.Text 
    End Get 
End Property  

Public ReadOnly Property NewMRN() As String 
    Get 
     Dim sNewMRN As String = String.Empty 

     For Each MyRow As TableRow In MyTable.Rows 
      For Each MyCell As TableCell In MyRow.Cells 
       If MyCell.ID = "MRNCell" Then 
        For Each MyControl As Control In MyCell.Controls 
         Dim MRNBox As New TextBox 
         MRNBox = TryCast(MyControl, TextBox) 
         If Not (MRNBox Is Nothing) Then 
          sNewMRN = MRNBox.Text 
         End If 
        Next 
       End If 

      Next 
     Next 
     'There is only one TextBox in the table and sNewMRN = "" 
     Return sNewMRN 
    End Get 
End Property  

Public ReadOnly Property NewMRN() As String 
    Get 
     'For this one the TextBox is declared Public in the class 
     'The Text property = "" 
     Return txtMRN.Text 
    End Get 
End Property  

我有兩個公共只讀屬性。第一個從設計器中創建的TextBox返回Text屬性，其他嘗試返回在運行時創建的Text屬性。一個工作，另一個或者拋出一個異常或者返回一個空字符串，這取決於我使用的三種方法中的哪一種。

If Not PreviousPage Is Nothing Then 
     'Works 
     Dim sMessageID As String = PreviousPage.MessageID 
     'Does not work 
     Dim sNewMRN As String = PreviousPage.NewMRN 
     Literal1.Text = "<p>" & sMessageID & "</p><p>" & sNewMRN & "</p>" 

    End If 

所以，我怎麼能訪問在運行時創建一個文本框的Text屬性，有一個公共只讀屬性返回的值，這樣我就可以訪問|上一頁它？

格雷格

Answer 1

再次，寫問題讓我想想不夠，我想出了一個解決方案。我在設計時添加文本框，並將visible屬性設置爲false。然後在運行時，我會將其顯示並將其添加到表格行單元格中。

Greg