Entity framework 绑定到Datagridview的添加删除修改

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Windows.Forms;
 9
10 namespace EFBindingDataGridView
11 {
12     public partial class Form1 : Form
13     {
14         Model1 model = new Model1();
15         List<Setting> list = new List<Setting>();
16         public Form1()
17         {
18             InitializeComponent();
19         }
20
21         private void loadButton_Click(object sender, EventArgs e)
22         {
23             list = model.Settings.ToList() ;
24             bindingSource1.DataSource = list;
25             dataGridView1.DataSource = bindingSource1;
26         }
27
28         private void saveButton_Click(object sender, EventArgs e)
29         {
30             dataGridView1.EndEdit();
31             bindingSource1.EndEdit();
32             //保存前把新增的对象加入
33             foreach(Setting item in list)
34             {
35                 if(model.Entry(item).State == System.Data.Entity.EntityState.Detached)
36                 {
37                     model.Settings.Add(item);
38                 }
39             }
40             model.SaveChanges();
41         }
42
43
44         private void dataGridView1_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
45         {
46             //获取删除的对象
47             Setting set = (Setting)e.Row.DataBoundItem;
48             model.Settings.Remove(set);
49         }
50
51     }
52 }