为什么ID是空的，从Gridview中挑选出来的？

Question

为什么deviceID是空的，我是从SP里面填的。在后端它给出完美的结果甚至完美地填充 Gridview 但在 .cs 级别它会产生问题

Select DeviceID, TerminalSNO, SoftwareVersion from Transport.Devices

它给出了完美的结果，但在 asp.net 中它从 gridview

中选择了 ""

GV:

<asp:GridView ID="GridviewDevicesBulkUpdate" runat="server" Width="100%" AutoGenerateColumns="False"
    DataKeyNames="DeviceID" CssClass="table table-hover table-striped table-bordered">
    <Columns>
        <asp:BoundField DataField="DeviceID" HeaderText="DeviceID" Visible="false" ItemStyle-CssClass="visible-desktop" />
        <asp:BoundField DataField="TerminalSNO" HeaderText="Serial No." ItemStyle-CssClass="visible-desktop"
            HeaderStyle-CssClass="visible-desktop" />
        <asp:BoundField DataField="SoftwareVersion" HeaderText="Software Version" ItemStyle-CssClass="visible-desktop"
            HeaderStyle-CssClass="visible-desktop" />
        <asp:TemplateField HeaderText="Includes ?">
            <ItemTemplate>
                <asp:CheckBox runat="server" ID="CheckBoxIncludes" Text="." CssClass="checkbox checkbox-danger" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

.cs

foreach (GridViewRow Row in GridviewDevicesBulkUpdate.Rows)
{

    CheckBox chkUpdate = (CheckBox)Row.Cells[3].FindControl("CheckBoxIncludes");
    if (chkUpdate.Checked == true)
    {

        string DeviceID = Row.Cells[0].Text.Trim();

        if (ManageTransport.ManageDevices.UpdateAllDevices(IsCardPwdUpdated, SoftwareVersion, IsActive, int.Parse(DeviceID)))
        {
            Response = true;
        }
        else
        {
            Response= false;
        }
    }
}

Answer 1

添加 RowType 个 GridView，例如 if (Row.RowType == DataControlRowType.DataRow)

CheckBox chkUpdate = (CheckBox)Row.FindControl("CheckBoxIncludes");

您的代码：

foreach (GridViewRow Row in GridviewDevicesBulkUpdate.Rows)
 {
    if (Row.RowType == DataControlRowType.DataRow)
    {
    CheckBox chkUpdate = (CheckBox)Row.FindControl("CheckBoxIncludes");


     if (chkUpdate.Checked == true)
        {
         string DeviceID = Row.Cells[0].Text.Trim();
         if (ManageTransport.ManageDevices.UpdateAllDevices(IsCardPwdUpdated, SoftwareVersion, IsActive, int.Parse(DeviceID)))
         {
           Response = true;
         }
         else
         {
         Response= false;
         }
      }
    }
    }

Answer 2

我猜是因为你用了隐形的BoundField。您可以在这里阅读：

Retrieve data from visible false BoundField of Gridview

所以您可以按照那里的建议或使用带有标签的 TemlateField：

<Columns>
     <ItemTemplate>
        <Label runat="server" ID="LblDeviceID" Text='<%# Eval("DeviceID") %> ' Visible="false"  />
    </ItemTemplate>
    <asp:BoundField DataField="TerminalSNO" HeaderText="Serial No." ItemStyle-CssClass="visible-desktop"
        HeaderStyle-CssClass="visible-desktop" />
    <asp:BoundField DataField="SoftwareVersion" HeaderText="Software Version" ItemStyle-CssClass="visible-desktop"
        HeaderStyle-CssClass="visible-desktop" />
    <asp:TemplateField HeaderText="Includes ?">
        <ItemTemplate>
            <asp:CheckBox runat="server" ID="CheckBoxIncludes" Text="." CssClass="checkbox checkbox-danger" />
        </ItemTemplate>
    </asp:TemplateField>
</Columns>

然后您可以通过以下方式在代码隐藏中检索值：

Label lblDeviceID = (Label)Row.FindControl("LblDeviceID");
string DeviceID = lblDeviceID.Text;

与此同时，我一直在使用 TemplateFields，因为您可以在那里使用任何 html，而不会运行遇到此类问题。它们只是更灵活。

为什么ID是空的，从Gridview中挑选出来的？

Why ID is empty, picked from Gridview?

c#

asp.net

gridview