Entity framework 绑定到Datagridview的添加删除修改

Entity framework 绑定到Datagridview的添加删除修改

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace EFBindingDataGridView
{
    public partial class Form1 : Form
    {
        Model1 model = new Model1();
        List<Setting> list = new List<Setting>();
        public Form1()
        {
            InitializeComponent();
        }

        private void loadButton_Click(object sender, EventArgs e)
        {
            list = model.Settings.ToList() ;
            bindingSource1.DataSource = list;
            dataGridView1.DataSource = bindingSource1;
        }

        private void saveButton_Click(object sender, EventArgs e)
        {
            dataGridView1.EndEdit();
            bindingSource1.EndEdit();
            //保存前把新增的对象加入
            foreach(Setting item in list)
            {
                if(model.Entry(item).State == System.Data.Entity.EntityState.Detached)
                {
                    model.Settings.Add(item);
                }
            }
            model.SaveChanges();
        }


        private void dataGridView1_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
        {
            //获取删除的对象
            Setting set = (Setting)e.Row.DataBoundItem;
            model.Settings.Remove(set);
        }

    }
}