public static async Task <IQueryable <TModel> > GetQueryAsync <TModel, TData>(this IQueryable <TData> query, IMapper mapper, ODataQueryOptions <TModel> options, QuerySettings querySettings = null) where TModel : class { var expansions = options.SelectExpand.GetExpansions(typeof(TModel)); List <Expression <Func <TModel, object> > > includeExpressions = expansions.Select(list => new List <Expansion>(list)).BuildIncludes <TModel> ( options.SelectExpand.GetSelects() ) .ToList(); Expression <Func <TModel, bool> > filter = options.Filter.ToFilterExpression <TModel>(querySettings?.ODataSettings?.HandleNullPropagation ?? HandleNullPropagationOption.False); Expression <Func <IQueryable <TModel>, IQueryable <TModel> > > queryableExpression = options.GetQueryableExpression(); Expression <Func <IQueryable <TModel>, long> > countExpression = LinqExtensions.GetCountExpression <TModel>(filter); options.AddExpandOptionsResult(); if (options.Count?.Value == true) { options.AddCountOptionsResult <TModel, TData>(await query.QueryAsync(mapper, countExpression)); } IQueryable <TModel> queryable = await query.GetQueryAsync(mapper, filter, queryableExpression, includeExpressions, querySettings?.ProjectionSettings); return(queryable.UpdateQueryableExpression(expansions)); }