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);
         }

     }
 }