How can I turn a DirectoryObject into a Group?

Question

I'm attempting to retrieve a list of group names from the Microsoft.Graph API using the following method

private async Task<Dictionary<string, string>> GetGroupNames(List<string> groupIds)
{
    Microsoft.Graph.Groups.GetByIds.GetByIdsPostRequestBody requestBody = new()
    {
        Ids = groupIds,
        // Why do I need to specify that the type is group when I'm using a constructor in the Groups namespace?
        Types = new List<string> { "group" }
    };

    Microsoft.Graph.Groups.GetByIds.GetByIdsResponse result = (await graphServiceClient.Groups.GetByIds.PostAsync(requestBody))!;
    Group[] groups = result.Value!.Cast<Group>().ToArray();
    return groups.ToDictionary(g => g.Id!, g => g.DisplayName!);
}

result.Value is then a list of DirectoryObjects where each object has ODataType "#microsoft.graph.group".

From what I've seen on this website (e.g. here) it should be possible to simply cast the DirectoryObjects to the correct type Microsoft.Graph.Group, but that does not work. This gives the message

Unable to cast object of type 'Microsoft.Graph.Models.DirectoryObject' to type 'Microsoft.Graph.Models.Group'.

So how exactly am I meant to turn these DirectoryObjects into Groups?

Answer 1

Upgrading Microsoft.Graph from 5.23.0 to 5.24.0 fixed it. I believe these are the relevant nuget packages

<PackageReference Include="Microsoft.Graph" Version="5.24.0" />
<PackageReference Include="Microsoft.Identity.Client" Version="4.55.0" />
<PackageReference Include="Microsoft.Identity.Web" Version="2.13.3" />
<PackageReference Include="Microsoft.Identity.Web.GraphServiceClient" Version="2.13.3" />

I don't know if this was a bug in 5.23.0 or if I had incompatible nuget packages installed, but whatever the case it works now.

Edit: Thanks to @user2250152 I now know this was a bug in 5.23.0. See https://github.com/microsoftgraph/msgraph-sdk-dotnet/issues/2084