public Specification <T> AndAlso(Expression <Func <T, bool> > andWhere)
{
if (Where == null)
{
Where = andWhere;
return(this);
}
var p = Where.Parameters[0];
var visitor = new SubstExpressionVisitor
{
Subst = { [andWhere.Parameters[0]] = p }
};
Expression body = Expression.AndAlso(Where.Body, visitor.Visit(andWhere.Body) ?? throw new InvalidOperationException());
Where = Expression.Lambda <Func <T, bool> >(body, p);
return(this);
}
public Specification <T> OrElse(Expression <Func <T, bool> > orWhere)
{
//TODO Refactor
if (Where == null)
{
Where = orWhere;
return(this);
}
var p = Where.Parameters[0];
var visitor = new SubstExpressionVisitor
{
Subst = { [orWhere.Parameters[0]] = p }
};
Expression body = Expression.OrElse(Where.Body, visitor.Visit(orWhere.Body) ?? throw new InvalidOperationException());
Where = Expression.Lambda <Func <T, bool> >(body, p);
return(this);
}