c# - 如何使用 EWS 托管 API 保存项目附件

Question

是否可以保存一个ItemAttachment？对于 FileAttachment，我们使用以下 EWS 托管 API 代码来保存，

   if(attachment is FileAttachment)
    {
      FileAttachment fAttachment = new FileAttachment();
      fAttachment.Load("D:\\Stream" + fAttachment.Name);
    }

ItemAttachment 呢？我们如何将这样的 ItemAttachment 保存到指定的文件中？

Answer 1

当然，这仍然不是一个紧迫的问题，但我想我会分享给将来像我一样偶然发现这个问题的人。

对于 ItemAttachments，您需要加载项目的 MimeContent，然后您可以简单地写入文件/输出 [".eml", ".msg"]:

if (attachment is FileAttachment)
{
    FileAttachment fileAttachment = attachment as FileAttachment;

    // Load attachment contents into a file.
    fileAttachment.Load(<file path>);
}
else // Attachment is an ItemAttachment (Email)
{
    ItemAttachment itemAttachment = attachment as ItemAttachment;

    // Load Item with additionalProperties of MimeContent
    itemAttachment.Load(EmailMessageSchema.MimeContent);

    // MimeContent.Content will give you the byte[] for the ItemAttachment
    // Now all you have to do is write the byte[] to a file
    File.WriteAllBytes(<file path>, itemAttachment.Item.MimeContent.Content);
}