如何在 C# 中使用 Microsoft Graph 库使用 $value

Question

I am trying to receive some .eml attachments from some emails. Based on the documentation from https://learn.microsoft.com/en-us/graph/outlook-get-mime-message I need to use: GET /users/{id}/messages/{id}/attachments/{id}/$value

The problem here is that I don't know how to do this using Microsoft.Graph library in C#. I don't know to append that "$value" to the call. Below I have attached the C# structure that I am currently using to get attachments for a specific email. Any advice could help. Thanks.

return await _graphServiceClient.Me.Messages[emailId].Attachments.Request().GetAsync()

Answer 1

SDK 目前不直接支持此功能。通常，为了将/$value段附加到生成的请求 URL，您可以访问Content请求构建器上的属性。问题是泛型IAttachmentRequestBuilder没有实现这个属性，而只是FileAttachmentRequestBuilder实现了。

因此，要使其与当前的 SDK 一起工作，您需要这样做：

var msgId = "message-id";
var attId = "attachment-id";

var attachmentRequestBuilder = client.Me.Messages[msgId].Attachments[attId];
var fileRequestBuilder = new FileAttachmentRequestBuilder(
    attachmentRequestBuilder.RequestUrl, client);

Console.WriteLine($"Request URL: {fileRequestBuilder.Content.Request().RequestUrl}");
var stream = await fileRequestBuilder.Content.Request().GetAsync();

using(var reader = new StreamReader(stream))
{
    Console.WriteLine("Attachment contents:");
    while (!reader.EndOfStream)
    {
        var line = reader.ReadLine();
        Console.WriteLine(line);
    }
}

我已经让 SDK 人员知道了这一点。