Linq与委托

using System;
using System.Linq;
using System.Reflection;
using Stuglxt_Models;
namespace ConsoleApp1
{
    public delegate int MydeleGate(int a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            #region 委托与多播
            //Student student = new Student();
            //MydeleGate mydeleGate =(a,b)=> a+b;
            //dynamic result = mydeleGate(5, 2);
            //Console.WriteLine(result);
            //mydeleGate += student.Add;
            //result = mydeleGate==null? mydeleGate+=student.Sub:mydeleGate+=student.Add;            
            //result=result(1, 2);         
            //Console.WriteLine(result);
            #endregion
            #region 数组linq查询方法
            //linq
            //int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
            //var item = from num in nums where num % 2 == 0 orderby num descending select num;
            //foreach (var i in item) {
            //    Console.WriteLine(i);
            //}
            #endregion
            #region 字符串linq查询方法
            //string[] nums = { "张**", "年*", "陈*", "刘*", "王*", "韩*", "吴*","年*" };
            //var list = nums.Where(item => item.Length == 2).Select(item => item).GroupBy(item => item.Substring(0, 1));
            //foreach (var item in list) {
            //    Console.WriteLine("-----------");
            //    Console.WriteLine("分组字段：{0}",item.Key);
            //    foreach (var k in item) {
            //        Console.WriteLine(k);
            //    }
            //}
            #endregion
            #region linq高级查询方法
            int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
            //var Count = nums.Count();//获取元素个数
            //Console.WriteLine(Count);
            int[] nums0 = { 1, 2, 2, 4, 4, 7, 7, 8, 9, 10 };
            //var list = nums.Skip(1).Take(3);//指定列跳过和选择指定项个数输
            //var list = nums.SkipWhile(i => i % 3 != 0).TakeWhile(i => i % 2 != 0);//跳过符合条件的数列和选取符合条件的数列            
            var list = nums0.Distinct();//去重复
            foreach (var i in list) {
                Console.WriteLine(i);
            }            
            #endregion
            Console.ReadKey();
        }
        class Student
        {
            public int Add(int a, int b) => a + b;
            public int Sub(int a, int b) => a - b;
        }
    }
}