Ling && Lambda

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

 namespace Test_Lambda_Linq
 {
     class Program
     {
         static List<Person> PersonList = new List<Person>()
             {
                 new Person(){ Id=, Age=, Name="James", Gender="Male"},
                 new Person(){ Id=, Age=, Name="Harden", Gender="Male" },
                 new Person(){ Id=, Age=, Name="George", Gender="Female"},
                 new Person(){ Id=, Age=, Name="Ball", Gender="Female"},
                 new Person(){ Id=, Age=, Name="Kobe", Gender="Male"},
                 new Person(){ Id=, Age=, Name="Fames", Gender="Male"},
                 new Person(){ Id=, Age=, Name="Garden", Gender="Male" },
                 new Person(){ Id=, Age=, Name="Deorge", Gender="Female"},
                 new Person(){ Id=, Age=, Name="Hall", Gender="Female"},
                 new Person(){ Id=, Age=, Name="Dobe", Gender="Male"},
                 new Person(){ Id=, Age=, Name="Lames", Gender="Male"},
                 new Person(){ Id=, Age=, Name="Parden", Gender="Male" },
                 new Person(){ Id=, Age=, Name="Keorge", Gender="Female"},
                 new Person(){ Id=, Age=, Name="Yall", Gender="Female"},
                 new Person(){ Id=, Age=, Name="Robe", Gender="Male"}
             };
         static List<Children> ChildList = new List<Children>()
         {
             new Children(){ Id=, Name="Tomas", Age=, Class=, Gender="Female"},
             new Children(){ Id=, Name="James", Age=, Class=, Gender="Male"},
             new Children(){ Id=, Name="Jungle", Age=, Class=, Gender="Male"}
         };
         static void Main(string[] args)
         {
             //PersonList.Reverse();//全盘逆序
             //PersonList.Reverse(0,4);//指定范围逆序
             #region Lambda
             #region Sort排序
             //ServiceInvoke.Invoke(() =>
             //{
             //    foreach (var p in PersonList)
             //    {
             //        Console.WriteLine(p.Name);
             //    }
             //});

             //PersonList.Sort((p1, p2) => { return p1.Age - p2.Age; });
             //PersonList.Sort((p1, p2) =>  p1.Age - p2.Age );//排序

             //ServiceInvoke.Invoke(() =>
             //{
             //    foreach (var p in PersonList)
             //    {
             //        Console.WriteLine(p.Name);
             //    }
             //});
             #endregion

             #region Where筛选高手
             //ServiceInvoke.Invoke(() =>
             //{
             //    List<Person> pTemp = PersonList.Where(p => p.Age > 20 && p.Gender == "Male").ToList();
             //    foreach (var p in pTemp)
             //    {
             //        Console.WriteLine(p.Name + " is " + p.Age + " years old ");
             //    };
             //    PersonList.ForEach(p => Console.WriteLine(p.Name));
             //});
             #endregion

             #region Select投影大牛---查询投影
             //ServiceInvoke.Invoke(() =>
             //{
             //    List<Person> pTemp = PersonList.Where(p => p.Gender == "Male").Select(p => (Person)new LitePerson() { Name = p.Name , Age=p.Age}).ToList();
             //    foreach (var p in pTemp)
             //    {
             //        Console.WriteLine(p.Name + " is " + p.Age + " years old ");
             //    };
             //    PersonList.ForEach(p => Console.WriteLine(p.Name));
             //});
             #endregion

             #region OrderBy排序 第二次用ThenBy排序
             //ServiceInvoke.Invoke(() =>
             //{
             //    Console.WriteLine("Initial Order:"); PersonList.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old "));//原来
             //    List<Person> pTempDefault = PersonList.OrderBy(p => p.Age).ToList(); Console.WriteLine("Default Order:");//默认由小到大---升序
             //    pTempDefault.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old "));//排序后

             //    //单条件降序
             //    List<Person> pTempDescending = PersonList.OrderByDescending(p => p.Age).ToList(); Console.WriteLine("Descending Order:");//降序
             //    pTempDescending.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old "));

             //    //多条件综合排序
             //    List<Person> pTempOrderBy_ThenByDescending = PersonList.OrderBy(p => p.Age).ThenByDescending(p => p.Id).ToList(); Console.WriteLine("OrderBy_ThenByDescending Order:");
             //    pTempOrderBy_ThenByDescending.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old " + " And his Id is " + p.Id));
             //});
             #endregion

             #region Join 多个数据集(>=2)
             //ServiceInvoke.Invoke(() =>
             //{
             //    var joinedList = PersonList.Join(ChildList, p => p.Id, c => c.Id, (p, c) =>
             //    new { //匿名对象
             //        ParentID = p.Id,
             //        ChildID = c.Id,
             //        ParentName = p.Name,
             //        ChildName = c.Name
             //    }).ToList();
             //    joinedList.ForEach(j => Console.WriteLine(" ParentID: " + j.ParentID + " ChildID: " + j.ChildID + " ParentName: " + j.ParentName + " ChildName: " + j.ChildName));
             //});
             #endregion

             #region GroupBy
             //ServiceInvoke.Invoke(() =>
             //{
             //    IEnumerable<IGrouping<string, Person>> groups = PersonList.GroupBy(p => p.Gender);
             //    IList<IGrouping<string, Person>> groupList = groups.ToList();
             //    foreach (var g in groupList)
             //    {
             //        //Key是分组依据的类型---Gender
             //        Console.WriteLine("Group:{0}", g.Key=="Male" ? "Male" : "Female");
             //        foreach (Person p in g)
             //        {
             //            Console.WriteLine(p.Name + " is " + p.Gender);
             //        }
             //    }
             //});
             #endregion

             #region Skip与Take
             //实现分页
             //ServiceInvoke.Invoke(()=>
             //{
             //    Console.WriteLine("First Page:");
             //    var firstPageData = GetPagedListByIndex(1,5);
             //    firstPageData.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old " + " And his Id is " + p.Id));
             //    Console.WriteLine("Second Page:");
             //    var secondPageData = GetPagedListByIndex(2, 5);
             //    secondPageData.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old " + " And his Id is " + p.Id));
             //    Console.WriteLine("Third Page:");
             //    var thirdPageData = GetPagedListByIndex(1, 5);
             //    thirdPageData.ForEach(p => Console.WriteLine(p.Name + " is " + p.Age + " years old " + " And his Id is " + p.Id));
             //});
             #endregion
             #endregion

             #region Linq

             #region 基本查询
             //ServiceInvoke.Invoke(()=>
             //{
             //    var maleList = from p in PersonList
             //                   where p.Gender == "Male"
             //                   select p;
             //    maleList.ToList().ForEach(p => Console.WriteLine(p.Name + " is " + p.Gender));
             //});
             #endregion

             #region 排序条件查询
             //ServiceInvoke.Invoke(() =>
             //{
             //    var orderList = from p in PersonList
             //                   orderby p.Age descending//先按年龄排序
             //                   orderby p.Name ascending//在上面的基础上按姓名排序
             //                   select p;
             //    orderList.ToList().ForEach(p => Console.WriteLine(p.Name + " is " + p.Age));
             //});
             #endregion

             #region 连接查询
             //ServiceInvoke.Invoke(() =>
             //{
             //    var joinedList = from p in PersonList
             //                     join c in ChildList
             //                     on p.Id equals c.Id
             //                     select new
             //                     {
             //                         Person = p,
             //                         Child = c
             //                     };
             //    joinedList.ToList().ForEach(p => Console.WriteLine(" Person.Name is " + p.Person.Name + " Child.Name is " + p.Child.Name + " And Id is: "+ p.Child.Id));
             //});
             #endregion

             #region 分组查询
             ServiceInvoke.Invoke(() =>
             {
                 var groupList = from p in PersonList
                                  group p by p.Gender;
                 foreach (var g in groupList)
                 {
                     Console.WriteLine($"Group:{g.Key}");
                     foreach (var item in g)
                     {
                         Console.WriteLine(item.Name + " is "+ item.Gender);
                     }
                 }
             });
             #endregion

             #endregion
         }

         static List<Person> GetPagedListByIndex(int pageIndex, int pageSize)
         {
             List<Person> dataList = PersonList;
             return dataList.Skip((pageIndex - ) * pageSize).Take(pageSize).ToList();
         }
     }
 }