VSTO：缓存Exchange模式VS LastModificationTime

问题描述

我开发一个VSTO Outlook加载项是依靠Outlook约会的LastModificationTime财产。问题是，当缓存Exchange模式打开时，我每次关闭Outlook时LastModificationTime属性自动更新。有可能的解决方案，我可以使用，而不是日期和时间来获得日期和时间，如果用户更改了约会，当缓存Exchange模式改变了约会？

I am developing a VSTO Outlook Add-In that is relying on the LastModificationTime property of Outlook Appointment. The problem is when Cached exchange mode is turned On, the LastModificationTime property auto updates each time I close Outlook. Is there possible solution I can use to get the date and time when user changed the appointment, instead of date and time when cached exchange mode changed the appointment?

眼看有没有很多的反应，我想说明我的问题详细 - 这是发生了什么：

Seeing that there are not a lot of responses I wanted to describe my problem in more detail - this is what happens:

1. 在我更改项目（异常行为只发生在项目我已经改变了）
2. LastModificationTime被改变时，我已经保存的项目（我看到OutlookSpy的变化）的时间。 （如LastModificationTime下午3时30分00秒）
3. 在我的工作，直到下午四点00分00秒，并检查LastModificationTime，它仍然显示了下午3时30分○○秒
4. 在我关闭Outlook
5. 在我打开Outlook，并检查LastModificationTime。现在LastModificationTime显示三时三十分42秒，而不是3时三十零分00秒。为什么会增加额外的42秒我已经重新开放了展望后？

1. I change an item (the abnormal behavior happens only to items I've changed)
2. LastModificationTime is changed to the time when I've saved the item (I see the change with OutlookSpy). (eg. LastModificationTime 3:30:00 PM)
3. I work until 4:00:00 PM and check the LastModificationTime and it still shows 3:30:00 PM
4. I close outlook
5. I open outlook and check LastModificationTime. Now the LastModificationTime shows 3:30:42 instead of 3:30:00.Why did it add extra 42 seconds after I had reopened the Outlook?

感谢您对您能给我什么建议。

Thank you for any suggestions you can give me.

推荐答案

我能找到两种解决我的问题，＃1所不能接受的，我和＃2我实际使用：

I was able to find two workarounds for my problem, #1 being unacceptable for me and #2 I actually used:

解决方案1：使用注册表项来禁用Exchange服务器上加载停机和加载启动重新启用它。下面是示例code：

Solution #1: Use registry entries to disable exchange server on add-in shutdown and re-enable it on add-in startup. Below is sample code:

    Private Sub ThisAddIn_Startup(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Startup
    Try
        Dim regTopKey As String = "HKEY_CURRENT_USER"
        Dim regPath As String = "\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\13dbb0c8aa05101a9bb000aa002fc45a"
        Dim oldValue As Byte() = Registry.GetValue(regTopKey & regPath, "00036601_Backup", Nothing)
        If oldValue IsNot Nothing Then
            Registry.SetValue(regTopKey & regPath, "00036601", oldValue, RegistryValueKind.Binary)
        End If
    Catch
    End Try
End Sub

Private Sub ThisAddIn_Shutdown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shutdown
    Try
        Dim disableExchangeMode As Byte() = {4, 0, 0, 0}
        Dim regTopKey As String = "HKEY_CURRENT_USER"
        Dim regPath As String = "\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\13dbb0c8aa05101a9bb000aa002fc45a"
        Dim currentValue As Byte() = Registry.GetValue(regTopKey & regPath, "00036601", Nothing)
        If currentValue IsNot Nothing Then
            Registry.SetValue(regTopKey & regPath, "00036601_Backup", currentValue, RegistryValueKind.Binary)
        End If
        Registry.SetValue(regTopKey & regPath, "00036601", disableExchangeMode, RegistryValueKind.Binary)
    Catch
    End Try
End Sub

解决方案2：当用户更改的约会项目检测，并保存在用户定义的属性字段的变化。下面是示例code：

Solution #2: Detect when user changes an appointment item and save the change in user defined property field. Below is sample code:

Private Sub appointmentSave(ByVal Item As Object) Handles _m_olAppointment.ItemChange, _m_olAppointment.ItemAdd
    Try
        Dim dateNow As Date = Date.Now
        If TypeOf Item Is Outlook.AppointmentItem Then
            If (dateNow - _lastFolderSwitch).TotalMilliseconds > 500 Then
                _lastFolderSwitch = dateNow
                Dim appointmentItem As Outlook.AppointmentItem = CType(Item, Outlook.AppointmentItem)
                If (dateNow - appointmentItem.LastModificationTime).TotalMilliseconds < 100 Then
                    Dim lastModifiedDate As Outlook.UserProperty = appointmentItem.UserProperties.Add("lastModifiedDate", Microsoft.Office.Interop.Outlook.OlUserPropertyType.olText, True)
                    lastModifiedDate.Value = dateNow.ToString
                    appointmentItem.Save()
                End If
            End If
        End If
    Catch ex As Exception
        MsgBox(ex.ToString)
    End Try
End Sub

感谢您大家，帮助

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