如何在GridView中找到TemplateField中的控件

Question

我在gridField中有一個帶有textBox的gridView。我想提取文本框的文本，如果複選框在行中標記。

我定義爲GridView控件如下

<asp:GridView ID="GV_Comments" runat="server" AutoGenerateColumns="False" DataKeyNames="id" 
     DataSourceID="SQL_Comments"> 
     <Columns> 
      <asp:TemplateField> 
       <ItemTemplate> 
        <asp:CheckBox runat="server" ID="Comment_Select" /> 
       </ItemTemplate> 
      </asp:TemplateField> 
      <asp:BoundField DataField="ID" HeaderText="ID" ReadOnly="True" SortExpression="ID" /> 
      <asp:TemplateField HeaderText="comment" SortExpression="comment"> 
       <ItemTemplate> 
        <asp:Label ID="Label1" runat="server" Text='<%# Bind("comment") %>'></asp:Label> 
       </ItemTemplate> 
       <EditItemTemplate> 
        <asp:TextBox ID="CommentForPeriod" runat="server" Text='<%# Bind("comment") %>'></asp:TextBox> 
       </EditItemTemplate> 
      </asp:TemplateField> 
     </Columns> 
    </asp:GridView> 
    <asp:Button ID="B_Load" runat="server" Text="Transfer Selection" onclick="B_Load_Click" /> 
    <br /> 
    <asp:TextBox ID="CompiledText" runat="server" Width="662px" Rows="10" 
     TextMode="MultiLine"></asp:TextBox> 

，代碼如下

Protected Sub B_Load_Click(ByVal sender As Object, ByVal e As EventArgs) '(sender As Object, e As System.EventArgs) Handles B_Load.Click 
    Dim FullText As String = "" 
    For Each row As GridViewRow In GV_Comments.Rows 
     Dim CB_Control As CheckBox = CType(row.FindControl("Comment_Select"), CheckBox) 
     Dim Txt_Control As TextBox = CType(row.FindControl("CommentForPeriod"), TextBox) 
     If CB_Control IsNot Nothing AndAlso CB_Control.Checked AndAlso Txt_Control IsNot Nothing Then 
      FullText = FullText & Txt_Control.Text & "<br/>" 
     End If 
    Next row 
    CompiledText.Text = FullText.ToString 
End Sub 

當我調試的代碼，我可以看到，CheckBox控件被發現，但不TextBox控件。有人會看到爲什麼嗎？

Answer 1

你不能這樣做。當你點擊按鈕：B_Load，那麼GridView不在編輯模式。這就是爲什麼你不能得到TextBox，這是在EditItemTemplate。

由於gridview處於正常顯示模式，因此只能在點擊按鈕時獲取<ItemTemplate>中的控件。 <EditItemTemplate>控件僅在GridView進入Edit模式時纔會呈現。

因此，您需要在此處獲得標籤的值：Label1實際上，它具有相同的值，並且位於<ItemTemplate>的內部。

Dim Lbl_Control As Label= CType(row.FindControl("Label1"), Label) 

//按鈕像往常一樣點擊，只是得到並檢查Label控件的值，而不是TextBox控件。

Protected Sub B_Load_Click(ByVal sender As Object, ByVal e As EventArgs) '(sender As 
          Object, e As System.EventArgs) Handles B_Load.Click 
    Dim FullText As String = "" 
    For Each row As GridViewRow In GV_Comments.Rows 
     Dim CB_Control As CheckBox = CType(row.FindControl("Comment_Select"), 
              CheckBox) 
     Dim Lbl_Control As Label= CType(row.FindControl("Label1"), Label) 
     If CB_Control IsNot Nothing AndAlso CB_Control.Checked AndAlso Lbl_Control 
      IsNot Nothing Then 
      FullText = FullText & Lbl_Control.Text & "<br/>" 
     End If 
    Next row 
    CompiledText.Text = FullText.ToString 
End Sub