public static long Count <TKey, TEntity>(this IQueryStore <TKey, TEntity> queryStore, IStorageDbConnection conn, Expression <Func <TEntity, object> > member, WhereClauseResult whereClause)
     where TKey : IEquatable <TKey>
     where TEntity : class, IEntity <TKey>
 {
     if (queryStore == null)
     {
         throw new ArgumentNullException(nameof(queryStore));
     }
     return(queryStore.Count(conn, member, whereClause, null));
 }
 public static long Count <TKey, TEntity>(this IQueryStore <TKey, TEntity> queryStore, IStorageDbConnection conn, WhereClauseResult whereClause, IDbTransaction tr)
     where TKey : IEquatable <TKey>
     where TEntity : class, IEntity <TKey>
 {
     if (queryStore == null)
     {
         throw new ArgumentNullException(nameof(queryStore));
     }
     return(queryStore.Count(conn, null, whereClause, tr));
 }