C# 如何在GridView中显示外键的值？

在Web Forms ASP.NET应用程序中，我有一个将两个表连接在一起的存储过程，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

    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();
    }

<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>

因此，将使用ID、描述和连接到部门的ServiceChannel选择部门，并返回该部门

我在类型化数据集中使用的这个存储过程有一个名为

Department

的

TableAdapter

，它的方法是

getDepartmentswithServiceChannel

：

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

部门集合

，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

    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();
    }

<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，

返回departmentTA.GetDepartmentswithServiceChannel（）

部分返回以下错误：

输入字符串的格式不正确。无法存储 在ServiceChannel列中。应为Int32类型

---

如何使

GridView

显示外键的字符串值？

解决方案是基于datatable使

ServiceChannel

对象具有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;

---

使用reader-through循环读取值，通过应用查询为gridview获取该值，将该结果存储在datatable中并将结果循环到其中，然后逐个添加datarow并将结果存储在其中，然后将datatable与gridview绑定