Question

我有以下DetailsView，有几个BoundFields，以及填充字段的SQlDataSource：

<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DataKeyNames="TICKET_ID"
        DataSourceID="SqlDataSource1" HeaderText="Completed IT ticket information"
        CellPadding="4" ForeColor="#333333" GridLines="None" HorizontalAlign="Center">
        <Fields>
            <asp:BoundField DataField="TICKET_ID" SortExpression="TICKET_ID" Visible="False" />
            <asp:BoundField DataField="SUBMITTED_BY" SortExpression="SUBMITTED_BY" Visible="False" />

            <asp:BoundField DataField="TICKET_TITLE" HeaderText="Ticket Description" SortExpression="TICKET_TITLE" />
            <asp:BoundField DataField="SUBMITTED_BY" HeaderText="Submitted By" SortExpression="SUBMITTED_BY" />
            <asp:BoundField DataField="SOLUTION_NOTES" HeaderText="Solution Notes" SortExpression="SOLUTION_NOTES" />
            <asp:BoundField DataField="EMAIL_HISTORY" HeaderText="Email History" SortExpression="EMAIL_HISTORY" />
            <asp:BoundField DataField="COMPLETED_BY" HeaderText="Completed By" SortExpression="COMPLETED_BY" />
            <asp:BoundField DataField="COMPLETE_DATE" HeaderText="Completed Date" ReadOnly="True" SortExpression="COMPLETE_DATE" />
        </Fields>
    </asp:DetailsView>
    </div>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TTPRODConnectionString %>"
        SelectCommand="SELECT USR_ITFAC.TS_ID AS TICKET_ID, USR_ITFAC.TS_EC1_SUBMITTER AS SUBMITTED_BY, USR_ITFAC.TS_TITLE AS TICKET_TITLE, USR_ITFAC.TS_SOLUTION_NOTES AS SOLUTION_NOTES, USR_ITFAC.TS_EMAIL_HISTORY AS EMAIL_HISTORY, TS_USERS.TS_NAME AS COMPLETED_BY, DATEADD(HOUR,-8,USR_ITFAC.TS_CLOSEDATE) AS COMPLETE_DATE FROM USR_ITFAC INNER JOIN TS_USERS ON USR_ITFAC.TS_COMPLETED_BY = TS_USERS.TS_ID WHERE (USR_ITFAC.TS_ISSUEID = '00033')">
        <SelectParameters>
            <asp:QueryStringParameter Name="ts_id" QueryStringField="id" />
        </SelectParameters>
    </asp:SqlDataSource>

我在查询'00033'的末尾硬编码了一个值，这是我知道在数据库中的记录的ID。我测试了查询并返回了一个预期的值，我要做的是在用户按下按钮后在代码隐藏中获取BoundField的值。

Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Try
            ''Use a Dictionary to store answers to questions that were marked poor or fair
            Dim answers As New Dictionary(Of String, String)

            ''For Each test
        For Each dv_row As DetailsViewRow In DetailsView1.Rows
            ''Print rows data to console
        Next

        Catch ex As Exception
            lblWarn.Text = "<br /><b>Please answer all the questions on this survey</b><br />"
            'Response.Write(ex)
        End Try
    End Sub

上面我正在进行测试以获取值并在屏幕上打印它们，问题是行数是0，我不知道为什么会这样。我预计行数为8，调试时我注意到字段数是8，但我不确定如何从字段中获取值。我认为获取行数据的方式如下：

Dim rowText As String = DetailsView1.Rows(0).Cells(1).Text

但是当我尝试时，我得到一个Null异常。任何见解都表示赞赏。

Answer 1

我误读了代码。 FindControl（）在使用模板时有效。

请尝试在详细信息视图中使用FindControl(controlID)方法来查找数据绑定控件。该方法返回类型为Control的对象，因此您可能必须输入强制转换结果以获得实际用途。

Answer 2

能够启动并运行。事实证明BoundFields没有被填充，因为QueryStringField中的参数，即“id”，没有在请求URL中指定。为了解决这个问题，我首先尝试重写Page_Load上的URL路径，但这个路径不起作用，所以我刚创建了一个单独的页面，其中包含指向我正在处理的页面的超链接，并在URL的末尾附加了一个变量要引用的SQLDataSource的QueryString。有关QueryString属性的更多信息here。

Web表单中的数据绑定边界字段

2 个答案: