Question

我有一个嵌套在GridView中的转发器控件。在GridView更新我正在尝试DataBind中继器。我没有收到任何错误，但数据绑定不起作用。

我的设置是2个表，有很多关系。员工和PrincipleStaff。我正在使用PrincpleStaffs的导航属性（Principle Staff和Employee之间的隐藏连接表）。我可以通过编辑更新数据库，但在更新后无法看到更新。

这是我的代码。 GridView Update正在数据库中工作，但GridView更新未填充转发器控件。

ASPX：

<asp:GridView ID="AddPrincipleStaff" runat="server" AutoGenerateColumns="False" DataKeyNames="PrincipleStaffID" DataSourceID="PrincipleStaffEmployees" OnRowUpdating="AddPrincipleStaffGridView_RowUpdating">
        <Columns>
            <asp:CommandField ShowEditButton="True" />
            <asp:TemplateField HeaderText="" SortExpression="PrincipleStaffID">
                <EditItemTemplate>
                    <asp:Label ID="PrincipleStaffIDEditTemplate" runat="server" Text='<%# Eval("PrincipleStaffID") %>' style="display: none;"></asp:Label>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="PrinicpleStaffID" runat="server" Text='<%# Bind("PrincipleStaffID") %>' style="display: none;"></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="PrincipleStaffTitle" SortExpression="PrincipleStaffTitle">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("PrincipleStaffTitle") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("PrincipleStaffTitle") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="EmployeeName">
                <EditItemTemplate>
                    <asp:CheckBoxList ID="EmployeesCheckBoxes" runat="server" DataSourceID="EmployeesDataSource" DataTextField="empEmployeeName" DataValueField="empEmployeeID">
                    </asp:CheckBoxList>
                </EditItemTemplate>
                <ItemTemplate>

                    <asp:Repeater runat="server" ID="EmployeeList"></asp:Repeater>

                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

.cs文件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ModelFirst;

namespace FactoryWebsite
{
    public partial class AddPrincipalStaffEmployees : System.Web.UI.Page
    {
        FactoryTheaterModelFirstContainer db = new FactoryTheaterModelFirstContainer();

        protected void Page_Load(object sender, EventArgs e)
        {

            if (Session["ProductionID"] != null)
            {
                string stringSession = Session["ProductionID"].ToString();
                int intProductionID = Int32.Parse(stringSession);

                var production = from p in db.Productions
                                 where p.proProductionID == intProductionID
                                 select p.proProductionTitle;

                ProductionTitle.Text = production.FirstOrDefault();
            }

            else
                Response.Redirect("/AddProduction.aspx");
        }

        protected void AddPrincipleStaffGridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {

            foreach (GridViewRow row in AddPrincipleStaff.Rows)
            {
                CheckBoxList cbl = (CheckBoxList)row.FindControl("EmployeesCheckBoxes");
                if (cbl != null)
                {
                    foreach (ListItem item in cbl.Items)
                    {
                        if (item.Selected)
                        {
                            Label PrincipleID = AddPrincipleStaff.Rows[e.RowIndex].FindControl("PrinicpleStaffIDEditTemplate") as Label;

                            int PrincipleStaffID = 0;
                            PrincipleStaffID = Int32.Parse(PrincipleID.Text);
                            var ID = item.Value;
                            int EmployeeID = Int32.Parse(ID);

                            using (var context = new FactoryTheaterModelFirstContainer())
                            {
                                PrincipleStaff principlestaff = context.PrincipleStaffs.Single(s => s.PrincipleStaffID == PrincipleStaffID);
                                Employee employeeid = context.Employees.Single(s => s.empEmployeeID == EmployeeID);
                                principlestaff.Employees.Add(employeeid);
                                context.SaveChanges();
                            }

                        }
                    }
                }

            }
        }

        protected void AddPrincipleStaff_RowUpdated(object sender, GridViewUpdatedEventArgs e)
            {
                foreach (GridViewRow row in AddPrincipleStaff.Rows)
                {
                    Label psid = (Label)FindControl("PrinicpleStaffID");
                    Repeater employees = (Repeater)AddPrincipleStaff.FindControl("EmployeeList") as Repeater;

                    if (psid != null)
                    {

                        int intpsid = 0;
                        intpsid = Int32.Parse(psid.Text);

                        var context = new FactoryTheaterModelFirstContainer();
                        {
                            var query = context.PrincipleStaffs.Where(c => c.PrincipleStaffID == intpsid)
                                           .SelectMany(c => c.Employees)
                                           .Select(a => a.empEmployeeName).ToList();

                            employees.DataSource = query;
                            employees.DataBind();    
                        }

                    }

                }
        }


    }
}

Answer 1

我试图在这里做错事！我需要一个RowDataBound命令。这将更新父网格视图中的嵌套网格视图。

    protected void AddPrincipleStaff_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)// Bind nested grid view with parent grid view
        {

            var psid = DataBinder.Eval(e.Row.DataItem, "PrincipleStaffID");
            int intpsid = 0;
            intpsid = Int32.Parse(psid.ToString());

            using (var context = new FactoryTheaterModelFirstContainer())
            {
                var query = (from c in context.PrincipleStaffs
                             from p in c.Employees
                             where c.PrincipleStaffID == intpsid
                             select new
                             {
                                 Name = p.empEmployeeName
                             }).ToList();

                if (query.Count > 0)
                {
                    GridView childgrd = (GridView)e.Row.FindControl("ListEmployees"); // find nested grid view from parent grid veiw
                    childgrd.DataSource = query;
                    childgrd.DataBind();
                }
            }
        }

将列表添加到嵌套的Repeater控件

1 个答案: