LINQ到列表/集合意味着在列表或集合上编写LINQ查询。通过对集合或列表使用LINQ查询，无涯教程可以用最少的代码过滤或排序或删除重复的元素。
LINQ to List或Collection的语法
下面是在列表或集合上编写LINQ查询以获取所需元素的语法。
var result = from e in objEmpselect new
{
Name = e.Name,
Location = e.Location
};
在上述语法中，我们编写了 LINQ 查询以从“objEmp”集合/列表对象中获取所需的数据。
LINQ到列表/集合的示例
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp1
{
class Programme2
{
static void Main(string[] args)
{
//创建 Employee 类的对象 objEmp 并创建 Employee 信息列表
List objEmp = new List
()
{
new Employee { EmpId=1,Name = "Akshay", Location="Chennai" },
new Employee { EmpId=2,Name = "Vaishali", Location="Chennai" },
new Employee { EmpId=3,Name = "Priyanka", Location="Guntur" },
new Employee { EmpId=4,Name = "Preeti", Location ="Vizag"},
};
//这里使用 LINQ 查询从数据集合中排序或选择元素
var result = from e in objEmp
where e.Location.Equals("Chennai")
select new
{
Name = e.Name,
Location = e.Location
};
//foreach 循环用于打印具有 LINQ 查询输出的“结果”的值
foreach (var item in result)
{
Console.WriteLine(item.Name + "\t | " + item.Location);
}
Console.ReadLine();
}
</span><span class="pun">}</span><span class="pln">
</span><span class="com">//创建员工类</span><span class="pln">
</span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Employee</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> </span><span class="typ">EmpId</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">get</span><span class="pun">;</span><span class="pln"> </span><span class="kwd">set</span><span class="pun">;</span><span class="pln"> </span><span class="pun">}</span><span class="pln">
</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">string</span><span class="pln"> </span><span class="typ">Name</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">get</span><span class="pun">;</span><span class="pln"> </span><span class="kwd">set</span><span class="pun">;</span><span class="pln"> </span><span class="pun">}</span><span class="pln">
</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">string</span><span class="pln"> </span><span class="typ">Location</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">get</span><span class="pun">;</span><span class="pln"> </span><span class="kwd">set</span><span class="pun">;</span><span class="pln"> </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span></employee></employee></pre></div>
在上面的代码中，我们使用了对列表“objEmp”的LINQ查询来根据需求获取需要的元素。
输出：
参考链接
