以下代码均来自微软官网 /// 
 /// This sample uses Take to get only the first 3 elements of the array. /// 
 public void Linq1() {
   int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; var first3Numbers = numbers.Take(3); //从第一个元素开始,获取三个     Console.WriteLine("First 3 numbers:"); foreach (var n in first3Numbers)     {
           Console.WriteLine(n);     } } result----- First 3 numbers: 5 4 1 /// 
 /// This sample uses TakeWhile to return elements starting from the beginning /// of the array until a number is hit that is not less than 6 /// 
 public void Linq2() {
   int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; //在这里需要注意.使用TakeWhile获取小于6的元素,是从第一个元素开始, //一直到不满足其小于6这个条件为止.也就是执行到和9这个元素比较后,就结束比较了 //可以想象一下执行过程. //5<6=true;4<6=true;1<6=true;3<6=true //9<6=false;   这里就停止继续比较了     var firstNumbersLessThan6 = numbers.TakeWhile(n => n < 6);     Console.WriteLine("First numbers less than 6:"); foreach (var n in firstNumbersLessThan6)     {
           Console.WriteLine(n);     } } result---- First numbers less than 6: 5 4 1 3 /// 
 /// This sample uses Skip to get all but the first 4 elements of the array /// 
 public void Linq3() {
   int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; var allButFirst4Numbers = numbers.Skip(4);  //跳过前四个元素,获取后面所有的元素     Console.WriteLine("All but first 4 numbers:"); foreach (var n in allButFirst4Numbers)     {
           Console.WriteLine(n);     } } result--- All but first 4 numbers: 9 8 6 7 2 0 /// 
 /// This sample uses SkipWhile to get the elements of the array starting from the first element divisible by 3. /// 
 public void Linq4() {
   int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; //跳过不能被3整除的所有元素 //这里和TakeWhiel又有些不一样。 //TakeWhile遇到条件不满足的时候,就会return, //但是SkipWhile如果执行到能被三整除的数,那么其后面的元素就不会继续比较了 //同样,想象一下执行过程 //5%3!=0==true;     4%3!=0==true;   1%3!=0==true; //3%3!=0==false;  运行到这里的时候,后面的就不再比较. //所以输出结果中会有8、7、2、0这几个不满足条件的元素     var allButFirst3Numbers = numbers.SkipWhile(n => n % 3 != 0);     Console.WriteLine("All elements starting from first element divisible by 3:"); foreach (var n in allButFirst3Numbers)     {
           Console.WriteLine(n);     } } result--- All elements starting from first element divisible by 3: 3 9 8 6 7 2 0