c# – 为什么我的自定义控件的组件未启动？

要在aspx页面上使用该控件,它需要是UserControl,因此GridView作为GenericTable中的组件包含在内：

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="GenericTable.ascx.cs" Inherits="CASH.WebApplication.Controls.GenericTable" %>
<div style="width: 100%; overflow: scroll">
    <asp:GridView ID="grid" runat="server"></asp:GridView>
</div>

这适用于我的控件的第一次使用,它已添加到aspx页面.似乎这样做会增加某种启动控制组件的魔力.
当用户单击具有其自身属性的项时,GenericTable应在当前行下方插入一行并生成将显示所述属性的新GenericTable. table是我用来设置GridView内容的DataTable：

var data = table.NewRow();
var child = new GenericTable();

data[0] = child;

table.Rows.InsertAt(data,row);
grid.DataSource = table;
grid.DataBind(); // The extra row is displayed Now,initialize components in the aspx code?
child.MakeTable(); // Throws exception because it's `grid` property is null.

当我尝试激活新制作的GenericTable时,在此代码之后,它的网格为空.

有没有办法初始化此控件位于aspx代码中时发生的相同魔术？

更新：也许问题在于如何在回发之间存储表,目前我正在使用会话,也许有更好的方法来记住用户输入？
整个GenericTable代码：

using Project.DomainModel.Models;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CASH.WebApplication.Controls
{
    public partial class GenericTable : UserControl
    {
        private PropertyInfo[] properties;
        //private GridView gridView;
        private DataTable table = new DataTable();
        private Dictionary<int,int> ingedrukt = new Dictionary<int,int>();

        protected void Page_Init(object sender,EventArgs e)
        {
            grid.RowCommand += WeergaveDossiers_RowCommand;
        }

        protected void Page_Load(object sender,EventArgs e)
        {
            if (!IsPostBack)
            {
                for (int i = 0; i < grid.Rows.Count; i++)
                {
                    grid.Rows[i].Cells[0].ColumnSpan = 0;
                }
            }
            else
            {
                properties = (PropertyInfo[])Session["properties"];
                table = (DataTable)Session["table"];
                ingedrukt = (Dictionary<int,int>)Session["ingedrukt"];

                foreach (var knop in ingedrukt)
                {
                    DetailRijToevoegen(knop.Key,knop.Value);
                }
            }

            grid.DataBind();
        }

        protected void SaveInSession()
        {
            Session["properties"] = properties;
            Session["table"] = table;
            Session["ingedrukt"] = ingedrukt;
        }

        protected void WeergaveDossiers_RowCommand(object sender,GridViewCommandEventArgs e)
        {
            int row = int.Parse((string)e.CommandArgument) + 1;
            int col = GetKolomIndex(e.CommandName) + 1;

            if (ingedrukt.ContainsKey(row))
            {
                if (ingedrukt[row] != col)
                {
                    //DetailRijVerwijderen(row);
                    //ingedrukt.Remove(row);
                    //ingedrukt[row] = col;
                }
            }
            else
            {
                ingedrukt[row] = col;
            }

            //DetailRijToevoegen(row,col);
            SaveInSession();
        }

        protected void DetailRijToevoegen(int row,int col)
        {
            var data = table.NewRow();
            var child = new GenericTable();
            child.grid = new GridView();

            data[0] = child;

            table.Rows.InsertAt(data,row);
            grid.DataSource = table;
            grid.DataBind();

            var cells = grid.Rows[row].Cells;
            // Only keep the first cell
            while (cells.Count > 1)
            {
                cells.RemoveAt(1);
            }

            child.MaakTable(new List<object>() { table.Rows[row][col] });

            grid.Columns[0].Visible = true;
            grid.Rows[row].Cells[0].ColumnSpan = table.Columns.Count;
        }

        protected void DetailRijVerwijderen(int row)
        {

        }

        protected int GetKolomIndex(string naam)
        {
            for (int i = 0; i < properties.Length; i++)
            {
                if (properties[i].Name == naam)
                {
                    return i;
                }
            }

            throw new InvalidDataException("Kolom naam " + naam + " niet bekend");
        }

        public void MaakTable(IEnumerable<object> data)
        {
            properties = data.First().GetType().GetProperties().Where(p => p.CanRead).ToArray();

            grid.AutoGenerateColumns = false;
            var details = new BoundField();
            details.datafield = "Details";
            grid.Columns.Add(details);

            table.Columns.Add(new DataColumn("Details",typeof(object)));
            foreach (var veld in properties)
            {
                table.Columns.Add(new DataColumn(veld.Name,(veld.Name == "Id" ? typeof(object) : veld.PropertyType)));
                grid.Columns.Add(MaakKolom(veld));
            }

            foreach (var entry in data)
            {
                var row = table.NewRow();
                int col = 0;

                foreach (var veld in properties)
                {
                    row[++col] = veld.GetValue(entry);
                }

                table.Rows.Add(row);
            }

            grid.DataSource = table;

            SaveInSession();
        }

        protected DataControlField MaakKolom(PropertyInfo veld)
        {
            DataControlField field;

            if (typeof(Entity).IsAssignableFrom(veld.PropertyType))
            {
                field = new ButtonField();
                ((ButtonField)field).DataTextField = veld.Name;
                ((ButtonField)field).ButtonType = ButtonType.Button;
                ((ButtonField)field).CommandName = veld.Name;
            }
            else if (veld.PropertyType == typeof(bool))
            {
                field = new CheckBoxField();
                ((CheckBoxField)field).datafield = veld.Name;
            }
            else if (veld.PropertyType.IsEnum)
            {
                field = new TemplateField();
                //((TemplateField)field).ItemTemplate = (ITemplate)new Label()
                //{
                //  Text = "#DataBinder.Eval(\"" + veld.Name + "\")",//};
            }
            else if (veld.PropertyType == typeof(DateTime))
            {
                field = new TemplateField();
                //field.DatePicker = true;
            }
            else
            {
                field = new BoundField();
                ((BoundField)field).datafield = veld.Name;
            }

            field.HeaderText = veld.Name;

            return field;
        }

        protected void OnRowDataBound(object sender,GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DaTarow)
            {

            }
        }
    }
}