I have an object that looks like this :

public class Consortium
{
    public string Id { get; set; }

    [JsonConverter(typeof(EnumDescriptionConverter))]
    public SourceType Type { get; set; }       

    public List<UserLibrary> Branches { get; set; }
}

Each Consortium has a list of UserLibrary's associated with it, and that class looks like this :

public class UserLibrary
{
    public string LibraryId { get; set; }

    public string RetailerId {get; set;}

    public string UserId { get; set; }

    public string Name { get; set; }

    public DateTime CreatedAt { get; set; }
}

I have a method which will allow the user to remove a library from one of their consortium (note: There may be many branches associated to the consortium).

However, I'm only being supplied a LibraryId, so I'm forced to traverse their list of Consortium, find which one contains the given id, then iterate over the branches and remove the one that matches the id.

Here is how I'm currently accomplishing this :

// Get the current list of consortiums
var user = _mediator.Send(new GetUserProfileCommand { UserProfileId = _principle.UserProfileId });
var userConsortia = user.SavedConsortia;

// the consortium to remove the library from
var branchToRemove = _libraryService.GetLibrary(id);
var consortRemove = new UserConsortium();

foreach (var userConsortium in userConsortia)
{    
    if (userConsortium.Branches.FirstOrDefault(c => string.Equals(c.LibraryId, id, StringComparison.OrdinalIgnoreCase)) != null)
    {
        consortRemove = userConsortium;
    }
}

// if the consortium id is null, something is f*
if (consortRemove.Id == null)
{
    return new JsonDotNetResult(HttpStatusCode.BadRequest);
}

// first remove the consortia
userConsortia.Remove(consortRemove);

// remove the branch from the consortium
consortRemove.Branches.RemoveAll(ul => string.Equals(ul.LibraryId, id, StringComparison.OrdinalIgnoreCase));

// add it back in without the branch
userConsortia.Add(consortRemove);        

Question :

Is there a LINQ expression I'm missing here that can help me consolidate this logic, or is there a better way of doing this?