How to get a single custom sized thumbnail binary?

[Ghostbird]

I'm migrating from SDK 4 to SDK 5 and ran into the issue that I cannot find how to convert this code:

      return await myDriveItemRequestBuilder
        .Thumbnails["0"]["c256x256"]
        .Content
        .Request()
        .GetAsync(cancellationToken);

Which generates a URI like:

/me/drive/items/{item-id}/thumbnails/0/c256x256/content

I've managed to get to

      return await myDriveItemRequestBuilder
        .Thumbnails["0"]
        .GetAsync(request => request.QueryParameters.Select = ["c256x256"], cancellationToken);

However this generates a "wrong" URI for the thumbnail, which isn't suitable for getting the binary data AFAICS. It generates OData select, and it seemingly cannot be made to download content.

Both get a single thumbnail and retrieve thumbnail binary content have no documentation that pertains to the C# SDK. It says:

Snippet not available

[andrueastman]

Thanks for raising this @Ghostbird

This is a issue with the metadata used to generate the SDK. In the meantime you can work around this with a code sample like below.

var thumbnailContent = graphClient.Drives["drive-id"].Items["item-id"].Content.WithUrl("https://graph.microsoft.com/me/drive/items/{item-id}/thumbnails/{thumb-id}/{size}/content").GetAsync();

[Ghostbird]

Ah, brilliant! I'd tried WithUrl on several properties of the thumbnail API but the return type was never right. But of course, on the ContentRequestBuilder it has the right type!

[Ghostbird]

Note: The URI template in the answer omits the version¹. The URI must always include a version part. The URI use above will throw ODataError: Invalid version me.

The corrected version of the URI template above would be: https://graph.microsoft.com/v1.0/me/drive/items/{item-id}/thumbnails/{thumb-id}/{size}/content.

In my case our software is not operating on behalf of a user, and I therefore use: https://graph.microsoft.com/v1.0/drives/{drive-id}/items/{item-id}/thumbnails/{thumb-id}/{size}/content

And because in my case I wanted to generate a custom template size, the final URI template I used is:
https://graph.microsoft.com/v1.0/drives/{drive-id}/items/{item-id}/thumbnails/0/c256x256/content

Footnotes

1. Oddly in most Microsoft Graph API documentation examples, including some on the documentation page about versioning, the version is omitted, and when you try to apply the examples they will not work. ↩