visual-studio - 在 lightswitch 应用程序中保存屏幕更改历史记录

Question

是否有任何简单的方法可以跟踪 lightswitch 应用屏幕上的更改？

我有一个显示客户信息的表单 (listdetail)。当我保存它时，我想将更改的内容写入历史表。

Answer 1

找到答案here .

只需在控件的 _updating、_inserting 事件中使用以下代码即可。

    Private Sub Employees_Updating(entity As Employee)
       Dim change = entity.EmployeeChanges.AddNew()
       change.ChangeType = "Updated" change.Employee = entity
       change.Updated = Now()
       change.ChangedBy = Me.Application.User.FullName

       Dim newvals = "New Values:"    
       Dim oldvals = "Original Values:"    

       For Each prop In entity.Details.Properties.All().
            OfType(Of Microsoft.LightSwitch.Details.IEntityStorageProperty)()

           If prop.Name <> "Id" Then             

                If Not Object.Equals(prop.Value, prop.OriginalValue) Then                 
                    oldvals += String.Format("{0}{1}: {2}", vbCrLf, prop.Name, prop.OriginalValue)
                    newvals += String.Format("{0}{1}: {2}", vbCrLf, prop.Name, prop.Value)
                End If         
           End If    

       Next   

      change.OriginalValues = oldvals
      change.NewValues = newvals

End Sub