public virtual IQueryState Accept(AggregateQueryExpression exp) { List <DbExpression> dbArguments = new List <DbExpression>(exp.Arguments.Count); foreach (Expression argument in exp.Arguments) { var arg = (LambdaExpression)argument; ScopeParameterDictionary scopeParameters = this._queryModel.ScopeParameters.Clone(arg.Parameters[0], this._queryModel.ResultModel); var dbArgument = GeneralExpressionParser.Parse(arg, scopeParameters, this._queryModel.ScopeTables); dbArguments.Add(dbArgument); } DbAggregateExpression dbAggregateExp = new DbAggregateExpression(exp.ElementType, exp.Method, dbArguments); PrimitiveObjectModel resultModel = new PrimitiveObjectModel(exp.ElementType, dbAggregateExp); QueryModel queryModel = new QueryModel(this._queryModel.ScopeParameters, this._queryModel.ScopeTables, this._queryModel.IgnoreFilters); queryModel.ResultModel = resultModel; queryModel.FromTable = this._queryModel.FromTable; queryModel.AppendCondition(this._queryModel.Condition); AggregateQueryState state = new AggregateQueryState(queryModel); return(state); }