PushStreamContent使用SqlDataReader.ExecuteReaderAsync将CSV或分隔文件流式传输到客户端

I'm trying to utilize WebAPI to stream a large amount of data from SQL Server to a delimited file without waiting for the entire result set to return from the database. I'm really terrible with Async and Await, haven't wrapped my head around it. It seems what I'd like to do should be possible using the PushStreamContent and the SqlDataReader async methods.I'm trying to utilize WebAPI to stream a large