LINQ Group Query

1.按照第一个字母进行分组

     static void Main(){string[] words = { "blueberry", "chimpanzee", "abacus", "banana", "apple", "cheese" };var wordGroupByFirstLetter =from word in wordsgroup word by word[0] into worderby w.Keyselect w;foreach (var groupedWord in wordGroupByFirstLetter){Console.WriteLine("word that start with letter is {0}",groupedWord.Key);foreach (var word in groupedWord){Console.WriteLine("{0}", word);}}}

2.按照平均分大于80的

public class Student{public string First { get; set; }public string Last { get; set; }public int ID { get; set; }public List<int> Scores;}class Program{public static List<Student> GetStudents(){List<Student> students = new List<Student>{new Student {First="Svetlana", Last="Omelchenko", ID=111, Scores= new List<int> {97, 72, 81, 60}},new Student {First="Claire", Last="O'Donnell", ID=112, Scores= new List<int> {75, 84, 91, 39}},new Student {First="Sven", Last="Mortensen", ID=113, Scores= new List<int> {99, 89, 91, 95}},new Student {First="Cesar", Last="Garcia", ID=114, Scores= new List<int> {72, 81, 65, 84}},new Student {First="Debra", Last="Garcia", ID=115, Scores= new List<int> {97, 89, 85, 82}} };return students;}static void Main(string[] args){List<Student> students = GetStudents();var boolenGroupQuery =from student in studentsgroup student by student.Scores.Average() > 80;foreach (var boolAverage in boolenGroupQuery){Console.WriteLine("{0}", boolAverage.Key == true ? "High Average" : "Low Average");foreach (var student in boolAverage){Console.WriteLine("First:{0},last:{1},Average:{2}", student.First, student.Last, student.Scores.Average());}}}

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