引发了“System.ArgumentNullException”类型的异常

Question

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Initgrv();
        }
    }
    protected void Page_Init(object sender, EventArgs e)
    {
        TemplateField tf3 = new TemplateField();        MyTemplate t3 = new MyTemplate("Del", "删除", "Customer", "Del");        tf3.ItemTemplate = t3;        grvTable.Columns.Add(tf3);
    }    private void Initgrv()
    {
        SqlDataSource1.ProviderName = "System.Data.OleDb";
        SqlDataSource1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + System.Web.HttpContext.Current.Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath.ToString()) + @"\App_Data\ACCESS\temp.mdb";
        SqlDataSource1.SelectCommand = "SELECT * FROM Customer";        grvTable.DataSourceID = "SqlDataSource1";
        grvTable.AutoGenerateColumns = false;
        grvTable.DataKeyNames = new string[] { "CustomerId" };
        grvTable.AllowPaging = true;
        grvTable.AllowSorting = true;
        grvTable.PageSize = 5;
    }    public class MyTemplate : System.Web.UI.Page, ITemplate
    {
        private string strText, strType, strFieldId, strFunc;        public string strSql = "";        public string strfieldid
        {
            set
            {
                strFieldId = value;
            }
            get
            {
                return strFieldId;
            }
        }        public MyTemplate()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            // 
        }        public MyTemplate(string strType, string strText, string strFieldId, string strFunc)
        {
            this.strText = strText;            this.strType = strType;            this.strFieldId = strFieldId;            this.strFunc = strFunc;
        }        public void InstantiateIn(Control container)
        {
            //删除按钮            LinkButton lkb = new LinkButton();            lkb.DataBinding += new EventHandler(lkb_DataBinding);            lkb.Click += new EventHandler(lkb_Click);            container.Controls.Add(lkb);        }        void lkb_Click(object sender, EventArgs e)
        {
            //操作数据库                        
            LinkButton lkb = (LinkButton)sender;            GridViewRow container = (GridViewRow)lkb.NamingContainer;            string strId = "aaa";
            if (container.DataItem != null)
            {
                strId = DataBinder.Eval(container.DataItem, "CustomerId").ToString();
            }             lkb.Text = strId;
        }        void lkb_DataBinding(object sender, EventArgs e)
        {
            LinkButton lkb = (LinkButton)sender;            GridViewRow container = (GridViewRow)lkb.NamingContainer;            lkb.Text = strText;
        }
    }
}
出错提示:引发了“System.ArgumentNullException”类型的异常

Answer 1

很可能是DataGridviewrow的问题 
不知道你执行到哪句话出的错

Answer 2

void lkb_Click(object sender, EventArgs e) 
        { 
            //操作数据库                        
            LinkButton lkb = (LinkButton)sender;             GridViewRow container = (GridViewRow)lkb.NamingContainer;             string strId = "aaa"; 
            if (container.DataItem != null) 
            { 
                strId = DataBinder.Eval(container.DataItem, "CustomerId").ToString(); 
            }             lkb.Text = strId; 
        } 
其中container.DataItem为空，为什么会出现这样的错误呢，难道是刷新了？