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当下拉列表嵌入到列表视图中时,我无法从数据集中填充下拉列表。我得到“对象引用未设置为对象的实例。” 因为,我相信,我没有使用 FindControl 正确访问下拉列表

我们不想在这个列表视图上编辑按钮,我们希望每一行都可以一次编辑。大多数在线示例都有编辑按钮。这可能是我问题的一部分。

大多数在线示例也使用 ASPX 页面中定义的数据源。我们一直专门使用 Oracle.DataAccess sys_refcursor 来填充数据集,然后将数据集用作数据源。所以我必须从 VB 端填充下拉列表,而不是使用 aspx 页面中的数据源。

我可以独立地填充列表视图,并独立地填充下拉列表,但是走路和嚼口香糖是失败的。

所以这里是我得到的一些片段:

<asp:ListView ID="lvMFGRS" runat="server">
    <ItemTemplate>
        <tr runat="server">
        <td runat="server">
           <asp:Label ID="NameLabel" runat="server" Text='<%#Eval("NEW_MANUFACTURER")%>' />
        </td>
        <td runat="server">
            <asp:dropdownlist ID="ddMFGRS"   runat="server" />
        </td>
        </tr>
    </ItemTemplate>
</asp:ListView>

然后在vb端是这样的:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
   newmfglist() 'just sticks data in the "NameLabel" and databinds, and this works fine.
   For Each lvItem In lvMFGRS.Items
      Dim ddlist As DropDownList = lvMFGRS.FindControl("ddMFGRS")
         For Each tbl2 As DataTable In dsmfgrlist.Tables
             For Each dr2 As DataRow In tbl2.Rows
                Dim str1 As String
                Dim str2 As String
                str1 = "dog" 'dr2.Field(Of String)("DataValueField")
                str2 = "cat" 'dr2.Field(Of String)("DataTextField")
                ddlist.Items.Add(New ListItem(str2, str1))  'this is where I get the error
             Next
          Next
       Next

结束子

那你觉得我做错了什么...

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1 回答 1

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答案是:

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
   newmfglist() 'just sticks data in the "NameLabel" and databinds, and this works fine.
   For Each lvItem In lvMFGRS.Items
      Dim ddlist As DropDownList = lvItem.FindControl("ddMFGRS")
         For Each tbl2 As DataTable In dsmfgrlist.Tables
             For Each dr2 As DataRow In tbl2.Rows
                Dim str1 As String
                Dim str2 As String
                str1 = "dog" 'dr2.Field(Of String)("DataValueField")
                str2 = "cat" 'dr2.Field(Of String)("DataTextField")
                ddlist.Items.Add(New ListItem(str2, str1))  'this is where I get the error
             Next
          Next
       Next
于 2014-01-15T20:30:52.090 回答