使用 REST API 下载 Outlook 附件？

Question

我正在处理与 Outlook 邮件相关的项目 API。我想下载电子邮件的附件。文档说我可以 "get" 附件，它们在 json 响应中 return 不同的参数，但我很想知道我必须将哪个参数转换为哪个参数才能得到实际的附件已保存到文件系统。

http://msdn.microsoft.com/office/office365/api/mail-rest-operations#Getattachments

谢谢。

Answer 1

根据文档，https://outlook.office.com/api/v2.0/me/messages/{message_id}/attachments returns 包含单个附件标识符的附件集合：

{
    "@odata.context": "https://outlook.office.com/api/v2.0/$metadata#Me/Messages('AAMkAGI2THVSAAA%3D')/Attachments(Name)",
    "value": [
        {
            "@odata.type": "#Microsoft.OutlookServices.FileAttachment",
            "@odata.id": "https://outlook.office.com/api/v2.0/Users('ddfcd489-628b-40d7-b48b-57002df800e5@1717622f-1d94-4d0c-9d74-709fad664b77')/Messages('AAMkAGI2THVSAAA=')/Attachments('AAMkAGI2j4kShdM=')",
            "Id": "AAMkAGI2j4kShdM=",
            "Name": "minutes.docx"
        }
    ] }

现在，您可以遍历此列表并使用此 API - https://outlook.office.com/api/v2.0/me/messages/{message_id}/attachments/{attachment_id} 获取单个附件，其中 attachment_id 是从上面 API 返回的标识符。

响应将是：

{
    "@odata.context": "https://outlook.office.com/api/v2.0/$metadata#Me/Messages('AAMkAGI2THVSAAA%3D')/Attachments/$entity",
    "@odata.type": "#Microsoft.OutlookServices.FileAttachment",
    "@odata.id": "https://outlook.office.com/api/v2.0/Users('ddfcd489-628b-40d7-b48b-57002df800e5@1717622f-1d94-4d0c-9d74-709fad664b77')/Messages('AAMkAGI2THVSAAA=')/Attachments('AAMkAGI2j4kShdM=')",
    "Id": "AAMkAGI2j4kShdM=",
    "LastModifiedDateTime": "2014-10-20T00:41:52Z",
    "Name": "minutes.docx",
    "ContentType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "Size": 11585,
    "IsInline": false,
    "ContentId": null,
    "ContentLocation": null,
    "ContentBytes": "UEsDBBQABgAIAAAAIQDCAAA4KQAAAAA=" }

现在，您可以使用 ContentBytes 和 contentType 在本地保存此附件。此外，附件可以是 ItemAttachments 或 FileAttachments。在 Google 上搜索更多内容肯定会引导您找到一些示例代码，其中显示了如何下载它们。但这应该给你一个想法。

你可以检查这个：

public static void GetAttachmentsFromEmail(ExchangeService service, ItemId itemId)
        {
            // Bind to an existing message item and retrieve the attachments collection.
            // This method results in an GetItem call to EWS.
            EmailMessage message = EmailMessage.Bind(service, itemId, new PropertySet(ItemSchema.Attachments));

            // Iterate through the attachments collection and load each attachment.
            foreach (Attachment attachment in message.Attachments)
            {
                if (attachment is FileAttachment)
                {
                    FileAttachment fileAttachment = attachment as FileAttachment;

                    // Load the attachment into a file.
                    // This call results in a GetAttachment call to EWS.
                    fileAttachment.Load("C:\temp\" + fileAttachment.Name);

                    Console.WriteLine("File attachment name: " + fileAttachment.Name);
                }
                else // Attachment is an item attachment.
                {
                    ItemAttachment itemAttachment = attachment as ItemAttachment;

                    // Load attachment into memory and write out the subject.
                    // This does not save the file like it does with a file attachment.
                    // This call results in a GetAttachment call to EWS.
                    itemAttachment.Load();

                    Console.WriteLine("Item attachment name: " + itemAttachment.Name);
                }
            }
        }

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