通过Azure Information Protection统一标签客户端读取Outlook电子邮件中设置的internet标头

Question

我正在使用Azure信息保护统一标签客户端来标记电子邮件。我们仍在我们的环境中使用PGP，严格保密的电子邮件必须经过PGP加密。

发送电子邮件时，我尝试找出电子邮件是如何分类的，并在分类是严格保密的情况下触发PGP加密。这是在Outlook VSTO c#外接程序中完成的。

为了找到分类，我阅读了AIP设置的电子邮件标题属性“msip_labels”，其中包含所有必要的信息。我正在使用以下过程读取标题。代码还远远不够完美。我只是在想，如何获得价值

private void GetHeaders()
{
    var mail = (Outlook.MailItem)Application.ActiveInspector().CurrentItem;
    var propertyAccessor = mail.PropertyAccessor;
    try
    {
        var custom = propertyAccessor.GetProperty("http://schemas.microsoft.com/mapi/string/{00020386-0000-0000-C000-000000000046}/msip_labels");
    }
    catch(Exception ex) 
    {
        var message = ex.Message;
    }
}

我能够读取由另一个工具设置的属性，但AIP属性是多行的。当代码执行时，我得到错误：类型冲突。（HRESULT:0x80020005（DISP_E_TYPEMISMATCH）的异常）

有没有办法读取多值属性？以下是msip_labels属性的示例（GUID替换为XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX）：

msip_labels: MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_Enabled=true;
 MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_SetDate=2019-11-14T07:16:38Z;
 MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_Method=Privileged;
 MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_Name=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX;
 MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_SiteId=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX;
 MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_ActionId=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX;
 MSIP_Label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_ContentBits=1
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_enabled: true
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_setdate: 2019-11-14T07:16:48Z
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_method: Privileged
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_name:
 XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_siteid:
 XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_actionid:
 XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
msip_label_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_contentbits: 0

Answer 1

除此之外：
如何将MIP Lablel设置为（Outlook VSTO）邮件项

    public void SetMIP_LabelPublic(MailItem newMailItem)
    {
        var lblID        = MipFileService.Label_Standard_Id;    // <== your label ID
        var tenantId     = MipSettings.TenantId;                 //<== azur information tenant (your company) id
        var mipMethod    = "Privileged";            
        var dd           = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssZ", CultureInfo.CreateSpecificCulture("en-us"));

        var mipPropertyText = $"MSIP_Label_{lblID}_Enabled=true; "
            + $"MSIP_Label_{lblID}_SetDate={dd}; "
            + $"MSIP_Label_{lblID}_Method={mipMethod}; "                
            + $"MSIP_Label_{lblID}_SiteId={tenantId}; ";


        newMailItem.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/string/{00020386-0000-0000-C000-000000000046}/msip_labels/0x0000001F", mipPropertyText);
    }

Answer 2

最后，我想出了如何创建属性架构字符串，以便它返回正确的数据类型。有助于找出数据类型的是使用Outlook Spy分析项目。使用正确的架构字符串进行查询msip_labels的正确代码行是：

var mSIPLabels = propertyAccessor.GetProperty("http://schemas.microsoft.com/mapi/string/{00020386-0000-0000-C000-000000000046}/msip_labels/0x0000001F") as string;

在属性名之后，我必须传递类型描述符0x0000001F