lyfz_repos/铂金版源码/LinQDome/LinQTest/Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //string[] words = { "cherry", "apple", "blueberry", "z", "cherry", "apple", "blueberry", "z" };
            //// words.GroupBy()
            //IEnumerable<IGrouping<string, string>> studentGroup = words.GroupBy(s => s);
            //foreach (IGrouping<string, string> word in studentGroup)
            //{
            //    Console.WriteLine(word.ToString());
            //    foreach (string value in word)
            //    {
            //        Console.WriteLine(value);
            //    }
            //}

            //Console.WriteLine("--------------------");

            //int shortestWordLength = words.Min(s => s.Length);
            //Console.WriteLine(shortestWordLength);
            //foreach (string word in words)
            //{
            //    Console.WriteLine(word);
            //}
            //Console.WriteLine("--------------------");
            //var temps = words.OrderBy(s=>s.Length);
            //foreach (string word in temps)
            //{
            //    Console.WriteLine(word);
            //}
            //Console.WriteLine("--------------------");
            //List<int> intList = new List<int>();
            //intList.AddRange(new[] {8,2,6,3,4,5,7,8,9,5 });
            //foreach (int word in intList)
            //{
            //    Console.WriteLine(word.ToString());
            //}
            //Console.WriteLine("--------------------");

            //var tempList = intList.OrderBy(s => s);
            //foreach (int word in tempList)
            //{
            //    Console.WriteLine(word.ToString());
            //}
            //Console.WriteLine("---------分组-----------");
            List<myMode> myModeList = new List<myMode>();
            myModeList.Add(new myMode("一班", "张三", 12));
            myModeList.Add(new myMode("一班", "李四", 20));
            myModeList.Add(new myMode("二班", "王五", 3));
            myModeList.Add(new myMode("二班", "小明", 60));
            myModeList.Add(new myMode("二班", "小丽", 18));
            IEnumerable<IGrouping<string, myMode>> studentGroup = myModeList.GroupBy(s => s.ClassName);
            foreach (IGrouping<string, myMode> word in studentGroup)
            {
                Console.WriteLine(word.Key);
                foreach (myMode value in word)
                {
                    Console.WriteLine(string.Format("班:{2}Name:{0},Age:{1}", value.Name, value.Age.ToString(), value.ClassName));
                }
            }

            //foreach (myMode m in myModeList)
            //{
            //    Console.WriteLine(string.Format("Name:{0},Age:{1}",m.Name,m.Age.ToString()));
            //}
            // Console.WriteLine("--------排序------------");
            //  var mys = myModeList.OrderBy(m => m.Age);
            //double gage=   myModeList.Average(s => s.Age);

            // foreach (myMode m in mys)
            // {
            //     Console.WriteLine(string.Format("Name:{0},Age:{1}", m.Name, m.Age.ToString()));
            // }
            // Console.WriteLine("--------查找------------");
            // IEnumerable<myMode> mModel = myModeList.Where(m => m.Age >12);//myModeList.Where(m=>m.Name=="李四");
            // foreach (myMode value in mModel)
            // {
            //     Console.WriteLine(string.Format("Name:{0},Age:{1}", value.Name, value.Age.ToString()));
            // }
            // Console.WriteLine("---------将序列中的每个元素投影到新表中---分组统计--------");
            //var newList= myModeList.GroupBy(g => g.ClassName).Select(s=>(new{NewClass=s.Key,GroupCount=s.Count(),Name=s.Max(item=>item.Name), Average_Age = s.Average(item => item.Age) }));

            // foreach (var value in newList)
            // {
            //     Console.WriteLine(string.Format("班:{2}Name:{0},Age:{1}", value.Name, value.Average_Age.ToString(), value.NewClass));
            // }

            Console.ReadKey();


            /*
             
            List<int> list = new List<int>();
            list.AddRange(new int[] { 1, 5, 10, 20, 33 });

            //使用Lambda表达式
            List<int> evenNumbers = list.FindAll(i => {

                bool ret = (i % 2) == 0;
                ret = ret == true && i > 10;
                return ret;
            });

            List<int> retList = new List<int>();
            foreach (int num in evenNumbers)
            {
                retList.Add(num);
            }
            int retIndex = list.FindIndex(1,2,i => ((i % 2) == 0));

            test((string s)=>{

                return "";
            });

             */

        }



    }


    class myMode
    {

        public myMode() {

        }
        public myMode(string c,string n,int a)
        {
            this.name = n;
            this.age = a;
            this.ClassName = c;
        }

        string _ClassName = "";

        string name = "";

        int age = 0;

        public string Name
        {
            get
            {
                return name;
            }

            set
            {
                name = value;
            }
        }

        public int Age
        {
            get
            {
                return age;
            }

            set
            {
                age = value;
            }
        }

        public string ClassName
        {
            get
            {
                return _ClassName;
            }

            set
            {
                _ClassName = value;
            }
        }

      
    }

}