Asp.net 在 ApiController 中添加自定义响应头

到目前为止，我有一个GET方法，如下所示:

protected override async Task<IHttpActionResult> GetAll(QueryData query)
{
     // ... Some operations

     //LINQ Expression based on the query parameters
     Expression<Func<Entity, bool>> queryExpression = BuildQueryExpression(query);

     //Begin to count all the entities in the repository
     Task<int> countingEntities = repo.CountAsync(queryExpression);

     //Reads an entity that will be the page start
     Entity start = await repo.ReadAsync(query.Start);

     //Reads all the entities starting from the start entity
     IEnumerable<Entity> found = await repo.BrowseAllAsync(start, queryExpression);

     //Truncates to page size
     found = found.Take(query.Size);

     //Number of entities returned in response
     int count = found.Count();

     //Number of total entities (without pagination)
     int total = await countingEntities;

     return Ok(new {
          Total = total,
          Count = count,
          Last = count > 0 ? GetEntityKey(found.Last()) : default(Key),
          Data = found.Select(e => IsResourceOwner(e) ? MapToOwnerDTO(e) : MapToDTO(e)).ToList()
     });
}

这很有魅力，很好.然而，我最近被告知将响应metadata(即Total、Count和Last属性)作为响应自定义头而不是响应体发送.

我无法从ApicController访问Response.我想到了一个过滤器或属性，但如何获取元数据值呢？

我可以在响应中保留所有这些信息，然后有一个过滤器，在发送到客户机之前将响应反序列化，并创建一个带有标题的新过滤器，但这似乎既麻烦又糟糕.

有没有办法直接从这个方法在ApiController上添加自定义标题？