vb.net – sqlbulkcopy – 不允许DBNull.Value.？

我正在尝试下面这两个调用但是它们都返回一个异常Customer_ID不允许dbnull.Value.但是当我调试时,我看到我的所有记录都分配了Customer_ID.它是我的数据库表中唯一一个不可为空的定义.是什么导致了这个错误？

bulkcopy.WritetoServer(myBookingDataTable)

   bulkcopy.WritetoServer(myBookingss.ToArray())

这是我的整个代码.

Using myConnection As sqlConnection = _
                New sqlConnection(connectionString)
                myConnection.open()


                Using bulkcopy As sqlBulkcopy = _
                  New sqlBulkcopy(My.Settings.ConnectionString(),sqlBulkcopyOptions.Default)

                    bulkcopy.DestinationTableName = "dbo.Booking"

                    Try
                        ' Write from the source to the destination.
                         bulkcopy.WritetoServer(myBookingDataTable)

                        'bulkcopy.WritetoServer(myBookingss.ToArray())

                    Catch ex As Exception
                        Console.WriteLine(ex.Message)

                    Finally

                        bulkcopy.Close()
                    End Try
                End Using

确保源和目标中字段的顺序相同.