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我无法确定导致编辑命令失败的问题

网格视图代码

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
    AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" 
    DataKeyNames="Requestid" DataSourceID="SqlDataSource1" ForeColor="#333333" 
    GridLines="None" Height="321px" Width="604px">
    <AlternatingRowStyle BackColor="White" />
    <Columns>
     <asp:CommandField ShowEditButton="True"  UpdateText="Submit" />
        <asp:BoundField DataField="Requestid" HeaderText="Requestid" ReadOnly="True" 
            SortExpression="Requestid" />
        <asp:BoundField DataField="Receiveddate" HeaderText="Receiveddate" 
            SortExpression="Receiveddate" />
        <asp:BoundField DataField="Ctname" HeaderText="Ctname" 
            SortExpression="Ctname" />
        <asp:TemplateField HeaderText="Requestor" SortExpression="Requestor">
            <EditItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server" 
                    DataSourceID="SqlDataSource2" DataTextField="analystname" 
                    DataValueField="contact_id" SelectedValue='<%# Bind("Requestor") %>'>
                </asp:DropDownList>
                <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
                    ConnectionString="<%$ ConnectionStrings:Customers %>"         SelectCommand="SELECT [contact_id], [first_name]+ space(1)+ [last_name] as analystname FROM [contact]
order by contact_id"></asp:SqlDataSource>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%# Bind("Requestor") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
    <EditRowStyle BackColor="#CC3300" />
    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#CBB06D" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#EFF3FB" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#F5F7FB" />
    <SortedAscendingHeaderStyle BackColor="#6D95E1" />
    <SortedDescendingCellStyle BackColor="#E9EBEF" />
    <SortedDescendingHeaderStyle BackColor="#4870BE" />
</asp:GridView>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ ConnectionStrings:Customers %>" SelectCommand="SELECT RR.Requestid,Convert(varchar(20),RR.Receiveddate,100) as Receiveddate,RR.Ctname,C.First_Name +Space(1) + C.Last_NAME as Requestor  from report_request_draft RR inner join Contact C on RR.requestor = C.contact_id
where clonedfromid is not null"

UpdateCommand="UPDATE [REPORT_REQUEST_DRAFT] SET  [REQUESTOR] = @Requestor  WHERE [requestid] = @requestid">

</asp:SqlDataSource>

当我单击编辑命令按钮时,它给了我以下错误

错误

“DropDownList1”有一个无效的 SelectedValue,因为它不存在于项目列表中。参数名称:value 说明:当前web请求执行过程中发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息:System.ArgumentOutOfRangeException:“DropDownList1”有一个无效的 SelectedValue,因为它不存在于项目列表中。参数名称:值

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2 回答 2

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考虑以下链接,它将帮助您解决问题,它还向您展示了如何在网格视图中完美地绑定EditItemTemplet 。我凝聚你使用这个链接更好地理解网格视图。

于 2012-12-05T16:17:23.093 回答
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DropDownList 不能以这种方式绑定。通过使用现有的SelectedValue绑定,它要求在绑定 GridView 之前绑定 DropDownList,但这是一个逻辑上的不可能,因为在 GridView 完成绑定之前无法绑定 DropDownList。您应该将此逻辑放在RowDataBound事件后面的代码中。此时,您应该手动绑定 DropDownList,然后设置其SelectedValue属性。

于 2012-12-05T15:42:35.850 回答