Linq 演变的过程(delegate => Lamb => Linq)

演变的过程(delegate => Lamb => Linq)
1.
Func<string,bool> filter = delegate(string s){
                            return s.Length == 5;};
Func<string,string> extract = delegate(string s){
                            return s;}
Func<string,string> project = delegate(string s){
                            return s.ToUpper();}

IEnumerable<string> query = names
                            .where(filter)
                            .orderby(extract)
                            .select(project);
2.
IEnumerable<string> query = names
                            .where(s => s.Length ==5)
                            .orderby(s => s)
                            .select(s => s.ToUpper())

3.
IEnumerable<string> query = from s in names
                            where s.Length ==5
                            orderby s
                            select s.ToUpper();

了解了代码的演变,有助于对linq有一个初步认识.