linq to js使用汇总

用途：方便js操作查询json数据。

下载网址：http://jslinq.codeplex.com/

使用方法：只需要引用linq.js即可。

查询方法：

一、where查询

var myList = [
  { Name: "Jim", Age: 20 },
  { Name: "Kate", Age: 21 },
  { Name: "Lilei", Age: 18 },
  { Name: "John", Age: 14 },
  { Name: "LinTao", Age: 25 }
];
var arrRes = Enumerable.From(myList).Where("x=>x.Name=='Jim'").ToArray();

二、排序：OrderBy

var myList = [
  { Name: "Jim", Age: 20 },
  { Name: "Kate", Age: 21 },
  { Name: "Lilei", Age: 18 },
  { Name: "John", Age: 14 },
  { Name: "LinTao", Age: 25 }
];
var arrRes = Enumerable.From(myList).OrderBy("x=>x.Age").ToArray();//降序OrderByDescending()

　

三、去重：Distinct

var myList = [
  { Name: "Jim", Age: 20 },
  { Name: "Kate", Age: 20 },
  { Name: "Lilei", Age: 20 },
  { Name: "John", Age: 14 },
  { Name: "LinTao", Age: 25 }
];
var arrRes = Enumerable.From(myList).Distinct("x=>x.Age").ToArray();

四、遍历：ForEach

var myList = [
  { Name: "Jim", Age: 20 },
  { Name: "Kate", Age: 20 },
  { Name: "Lilei", Age: 20 },
  { Name: "John", Age: 14 },
  { Name: "LinTao", Age: 25 }
   ];
   Enumerable.From(myList).ForEach(function(value, index){
        document.write("值="+value+",索引="+index);   
});

五、取唯一对象：First、FirstOrDefault、Last、LastOrDefault、Single、SingleOrDefault

var myList = [
  { Name: "Jim", Age: 20 },
  { Name: "Kate", Age: 20 },
  { Name: "Lilei", Age: 20 },
  { Name: "John", Age: 14 },
  { Name: "LinTao", Age: 25 }
];
var arrRes = Enumerable.From(myList).FirstOrDefault("x=>x.Age>18");

　

六、Skip、Take

Enumerable.Range(1,10).Skip(5)//结果[6,7,8,9,10]
Enumerable.Range(1,10).Take(5)//结果[1,2,3,4,5]