本文介绍了使用Linq在C#中进行列表操作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace ConsoleApplication1
{
public class Class1
{
static void Main(string[] args)
{
List<Car> mylist = new List<Car>();
Car car1;
Car car2;
Car car3;
car1 = new Car()
{
make = "Honda",
id = 1
};
car2 = new Car()
{
make = "toyota",
id = 2
};
car3 = new Car()
{
make = "Honda",
id = 3,
color = "red"
};
mylist.Add(car1);
mylist.Add(car2);
**////mylist.Where(p => p.id == 1).SingleOrDefault() = car3;**
}
}
public class Car
{
public int id { get; set; }
public string make { get; set; }
public string color { get; set; }
}
}
如何以最佳方式将ID 1的本田车替换为ID 3来更新列表.
How can I update the list by replacing the honda car of Id 1 with honda car with Id 3 in the best way.
推荐答案
所有嬉皮士说-加:
int index = mylist.FindIndex(p => p.id == 1);
if(index<0) {
mylist.Add(car3);
} else {
mylist[index] = car3;
}
这仅使用现有的FindIndex查找ID为1的汽车,然后替换或添加它.没有LINQ;没有SQL-只是一个lambda和List<T>
.
This just uses the existing FindIndex to locate a car with id 1, then replace or add it. No LINQ; no SQL - just a lambda and List<T>
.
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