Question

Protected Sub GridView_RowUpdating(sender As Object, e As GridViewUpdateEventArgs)

    Dim row As GridViewRow = GridView.Rows(e.RowIndex)
    Dim CustomerName As TextBox = TryCast(row.FindControl("CustomerName"), TextBox)
    Dim db As New SampleEntities()
    Dim ID As Integer = GridView.DataKeys(e.RowIndex).Value
    Dim obj = db.tblCustomer.First(Function(x) x.ID = ID)
    obj.CustomerName = CustomerName.Text
    db.SaveChanges()
    GridView.EditIndex = -1
    BindData()


End Sub

Protected Sub BindData()
      Dim db As New SampleEntities()
      Dim ps = (From p In db.tblCustomer
                  Select p)
        If ps.Count() > 0 Then
            GridView.DataSource = ps.ToList()
            GridView.DataBind()
        Else
            GridView.DataSource = Nothing
            GridView.DataBind()
        End If

End Sub

我收到类似这样的错误“对象引用没有设置为对象的实例。”

我该如何解决呢？请帮帮我。

Answer 1

您在哪一行收到此错误。如果您在

收到此错误

GridView.DataSource = ps.ToList（）

然后尝试如果ps！= null 则代替If ps.Count（）＆gt; 0然后。

我尝试使用实体框架更新gridview

1 个答案: