(input parameters) => expression
(x, y) => x==y;
() => Console.WriteLine("Hello World!");
当右边的表达式部分含有2个或以上表达式的时候,必须有“{“和”}”
(string x, int y) => { return y > x.Length};//返回一个布尔值
int[] arry = { 1, 2, 3, 5, 7, 9, 45, 12, 35, 62, 33, 44 };
//Where() 条件筛选
var query = arry.Where(val => val % 5 == 0);
foreach (var v in query)
Console.Write("{0} ", v);
Console.WriteLine();
输出结果:
int[] arry = { 1, 2, 3, 5, 7, 9, 45, 12, 35, 62, 33, 44 };
//OrderBy() 排序
//默认增序
var query = arry.OrderBy(val => val % 10);//将原来的数按取余10之后的大小排序
foreach (var v in query)
Console.Write("{0} ", v);
Console.WriteLine();
//OrderByDescending() 降序
query = arry.OrderByDescending(val => val % 10);//将原来的数按取余10之后的大小排序
foreach (var v in query)
Console.Write("{0} ", v);
int[] arry = { 1, 2, 3, 5, 7, 9, 45, 12, 35, 62, 33, 44 };
//Skip()、SkipWhile()跳过元素
//Skip(int n) 跳过前n个元素
var query1 = arry.Skip(3);
foreach (var v in query)
Console.Write("{0} ", v);
Console.WriteLine();
//SkipWhile() 跳过符合()中条件的元素
var query = query1.SkipWhile(num => num < 10);
foreach (var v in query)
Console.Write("{0} ", v);
2.5 用 //Take()、TakeWhile()提取元素
int[] arry = { 1, 2, 3, 5, 7, 9, 45, 12, 35, 62, 33, 44 };
//Take()、TakeWhile()提取元素
//Take(int n) 提取前n个元素
var query = arry.Take(3);
foreach (var v in query)
Console.Write("{0} ", v);
Console.WriteLine();
//TakeWhile() 提取符合()中条件的元素
query = arry.TakeWhile(num => num < 10);
foreach (var v in query)
Console.Write("{0} ", v);
int[] arry = { 1, 2, 3, 5, 7, 9, 45, 12, 35, 62, 33, 44 };
//运算操作 Max Min Average Sum
var max = arry.Max();
var min = arry.Min();
var ave = arry.Average();
var sum = arry.Sum();
Console.WriteLine("Max:{0} Min:{1} Average:{2} Sum:{3}", max, min, ave, sum);
string[] arry1 = { "Hello", "Tanks", "Sex", "Fun", "Apple" };
var max1 = arry1.Max();
var min1 = arry1.Min();
Console.WriteLine("Max:{0} Min:{1} ", max1, min1);
2.7 用Distinct() 删除重复元素
//Distinct() 删除重复元素
int[] arryy = { 1, 2, 1, 3, 6, 5, 7, 9, 5, 6, 4, 8, 5, 3 };
query = arryy.Distinct();
foreach (var v in query)
Console.Write("{0} ", v);
Console.WriteLine();
2.8 此外 Concat()连接两个集合 Union()并集 Intersect()交集 Except()差集