public override Expression <Func <Product, bool> > Build(NameValueCollection qs)
{
// 1. map query string dictionary with specification
foreach (string key in qs)
{
QueryStringConstants queryKey = QueryStringDictionary.Content[key];
ISpecification <Product> specification = _specificationFactory[queryKey].Create(qs[key]);
this._BaseSpecification = this._BaseSpecification.And(specification);
}
// 2. compile to Delegate
return(this._BaseSpecification.ToExpression());
}
public void SetSpecification(QueryStringConstants qConst, string type)
{
_sp = _spFactory[qConst].Create(type);
}
