_context.Database.SqlQuery<ImgInfo>("select * from ImageInfo  litmt 1 ").FirstOrDefault();

_context.Database.SqlQuery<(int id,string body)>("select id,body from imageInfo").ToListAsync();

 _context.Database.ExecuteScalar<long>($"select  count(0)  from pg_class where relname = '{ImageInfo}'");

​     var r = _context.Database.ExecuteNonQuery(Properties.Resources._imageinfo);

 _context.Database.ExecuteScalar<long>("select  count(0)  from pg_class where relname = {0}","asdfds");