internal static Expression <Func <TResult, bool> > WithParameter <TResult, TSource>(this Expression <Func <TSource, bool> > source, Expression <Func <TResult, TSource> > selector)
{
// Replace parameter with body of selector
var replaceParameter = new ParameterVisitor(source.Parameters, selector.Body);
// This will be the new body of the expression
var newExpressionBody = replaceParameter.Visit(source.Body);
return(Expression.Lambda <Func <TResult, bool> >(newExpressionBody, selector.Parameters));
}
protected internal virtual Query <T> CreateNewQuery(IQuery <T> query, Func <Expression, Expression, Expression> combiner)
{
var e2 = query.AsExpression();
var newE2 = new ParameterVisitor(e2.Parameters, _expression.Parameters).VisitAndConvert(e2.Body, nameof(CreateNewQuery));
var e3 = combiner(_expression.Body, newE2);
var lambda = Expression.Lambda <Func <T, bool> >(e3, _expression.Parameters);
return(new Query <T>(lambda));
}