C# 比较两个list 之间元素差异的常用方法

List<int> list1 = new List<int> { 1, 2, 3, 4, 5 };
List<int> list2 = new List<int> { 4, 5, 6, 7, 8 };
// 找出存在于list1中但不在list2中的元素
var diff = list1.Except(list2);
foreach (var item in diff)
{
    Console.WriteLine(item);
}

var diff2 = list2.Except(list1);
foreach (var item in diff2)
{
    Console.WriteLine(item);
}

var intersect = list1.Intersect(list2);

HashSet<int> set1 = new HashSet<int>(list1);
var diff3 = list2.Where(item => !set1.Contains(item));
var diff4 = list1.Where(item => !set1.Contains(item));

var customDiff = list1.Zip(list2, (a, b) => new { List1Value = a, List2Value = b })
                      .Where(pair => pair.List1Value != pair.List2Value)
                      .Select(pair => new { DifferentInList1 = pair.List1Value, DifferentInList2 = pair.List2Value });