本文概述
LINQ到列表/集合意味着在列表或集合上编写LINQ查询。通过在集合或列表上使用LINQ查询, 我们可以用最少的编码来过滤, 排序或删除重复项。
LINQ到列表或集合的语法
这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 objEmp
select new
{
Name = e.Name, Location = e.Location
};在以上语法中, 我们编写了LINQ查询, 以从” objEmp”集合/列表对象获取所需的数据。
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)
{
//create object objEmp of class Employee and create a list of the Employee information
List<Employee> objEmp = new List<Employee>
()
{
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"}, };
//here use the LINQ query to sort or select the element from the collection of data
var result = from e in objEmp
where e.Location.Equals("Chennai")
select new
{
Name = e.Name, Location = e.Location
};
//foreach loop is used to print the value of the 'result' having the output of the LINQ query
foreach (var item in result)
{
Console.WriteLine(item.Name + "\t | " + item.Location);
}
Console.ReadLine();
}
}
//create class employee
class Employee
{
public int EmpId { get; set; }
public string Name { get; set; }
public string Location { get; set; }
}
}在上面的代码中, 我们在列表” objEmp”上使用了LINQ查询, 以根据需求获取所需的元素。
输出
