Question

我在从网格中将数据保存到数据库时遇到问题。我不知道我做错了所以请帮忙。这是我的示例代码。

代码：

Imports System.Linq
 Public Class Grid1

  Public Property Year As Integer
  Public Property User As Integer

  End Class

   Public Class Form1

   public db as new databaseContext

   Dim Query As List(Of Grid1) = (From c In db.table Select New Grid1 With _
                                                      {_ 
                                                       .Year = c.Year, _
                                                       .User= c.User _ 
                                                      }).ToList

   dgv.DataSource = Query 

  Private Sub Button1_Click(sender As Object, e As EventArgs) Handles   Button1.Click

       Try
            db.SaveChanges()   '  i don't have any exception it just don't commit changes!

       Catch ex As Exception
        MessageBox.Show(ex.InnerException.ToString, ex.Message)
       End Try

    End Sub

Answer 1

@Clasies是正确的，您不绑定任何连接到数据库的东西。您需要绑定到Entity实例。尝试类似：

dgv.DataSource = New ObservableCollection(Of table)(db.table.ToList())

编辑：我添加了一个基本的sample project to GitHub和一个有效的EF6 DataGridView CRUD应用程序。

EF 6无法将数据从DGV提交到数据库

1 个答案: