Question

在Web窗体ASP.NET应用程序中，我有一个存储过程，它连接两个表，如下所示：

CREATE PROCEDURE dbo.usp_DepartmentsServiceChannelsSelect
AS
    SET NOCOUNT ON
SELECT     d.ID, d.Description,  s.ServiceChannel
FROM         Departments d
INNER JOIN [ServiceChannels] s
ON s.ID = d.ServiceChannel

GO

因此，部门会被选中，ID，描述和连接到部门的ServiceChannel也会被返回。

我在类型化数据集中使用此存储过程，其中TableAdapter名为Department，其方法为GetDepartmentsWithServiceChannels：

static public DepartmentDataTable GetDepartmentsWithServiceChannels()
{
    using (DepartmentTableAdapter departmentTA = new DepartmentTableAdapter())
    {
        return departmentTA.GetDepartmentsWithServiceChannels();
    }
}

我在视图中使用此方法在代码隐藏中绑定DepartmentCollection，如下所示：

    private void BindDepartmentsAfterSorting(string sortexpression, SortDirection 
              sortDirection)
    {
        DepartmentCollection deptCollection = 
              ServiceInterfaceRegistry.DepartmentManager.GetDepartments(false);

        if (deptCollection != null)
        {
            Common.Comparer<Department> objcmp = new Common.Comparer<Department>();
            objcmp.SortClasses.Add(new SortClass(sortexpression, sortDirection));
            deptCollection.Sort(objcmp);
        }
        MyGridView.DataSource = deptCollection;
        MyGridView.DataBind();
    }

MyGridvIew如下所示：

<asp:GridView ID="MyGridView" runat="server" DataKeyNames="ID" AutoGenerateColumns="False" Width="1000px"
            AllowSorting="True" AllowPaging="True" EmptyDataText="Geen afdeling gevonden." OnRowDataBound="AfdelingGridView_RowDataBound" OnRowDeleting="AfdelingGridView_RowDeleting"  OnRowEditing="MyGridView_RowEditing" OnPageIndexChanging="AfdelingGridView_PageIndexChanging" OnSorting="AfdelingGridView_Sorting">
            <Columns>
                <asp:ButtonField ButtonType="Button" Text="Delete/edit" CommandName="Edit">
                    <ItemStyle Width="20px" />
                </asp:ButtonField>
                <asp:TemplateField Visible ="False">
                    <ItemTemplate>
                        <asp:Button ID="Delete" runat="server" CommandName="Delete"  
           Text="Verwijderen" Font-Bold="false" />
                        </ItemTemplate> 
                        <ItemStyle Width="20px" />  
                  </asp:TemplateField>
                <asp:BoundField DataField="Description" HeaderText="Description" ReadOnly="True" SortExpression="Description" />
                <asp:BoundField DataField="ServiceChannel" HeaderText="Service Channel" ReadOnly="True"  />

            </Columns>
            <HeaderStyle HorizontalAlign="Left" />
</asp:GridView>

不幸的是，return departmentTA.GetDepartmentsWithServiceChannels()部分会返回以下错误：

输入字符串的格式不正确。无法存储在ServiceChannel列中。预期的类型是Int32。

如何让GridView显示外键的字符串值？

Answer 1

解决方案是使ServiceChannel对象具有基于数据表的ID属性，并在GetDepartments方法中匹配此对象的ID：

Department tmpDepartment = new Department(departmentRow);
            tmpDepartment.ServiceChannel = channels.Where(c => c.Id == 
                   departmentRow.ServiceChannelID).FirstOrDefault();

然后可以通过

在视图上访问此属性

e.Row.Cells[e.Row.Cells.Count - 1].Text = ((Department) 
                               e.Row.DataItem).ServiceChannel.Description;

如何在GridView中显示外键的值？

1 个答案: