筆記下按照某 bool 條件 (Id是否包含在指定清單中) 來排序集合
情境
一般使用某欄位按大小排序
需求是按照某清單，符合的優先，不符合地次之
結論
void Main()
{
List<User> users = new List<User> {
new User(1),
new User(2),
new User(3),
new User(4),
new User(5),
};
List<int> idList = new List<int> {2,4};
var newList = users.OrderByDescending(x=>idList.Contains(x.Id)).ToList();
newList.Dump();
}
// You can define other methods, fields, classes and namespaces here
public class User
{
public int Id { get; set; }
public User(int id) {Id = id;}
} 
