你如何使用LINQ查找特定属性的重复？ [英] How do you use LINQ to find the duplicate of a specific property?

问题描述

 客户customerOne =新客户（约翰福音，李四）; 
客户customerTwo =新客户（超级，人）; 
客户customerThree =新客户（疯狂的，人）; 
客户customerFour =新客户（简，李四）; 
客户customerFive =新客户（蝙蝠，人）; 
 
名单，LT;客户>客户=新的List<客户>（）; 
 customers.Add（customerOne）; 
 customers.Add（customerTwo）; 
 customers.Add（customerThree）; 
 customers.Add（customerFour）; 
 customers.Add（customerFive）; 
  

什么LINQ查询将返回一个枚举为所有客户提供相同的姓氏？

结果应该包括的一个实例：李四，李四，超男子，和蝙蝠男

解决方案

  VAR的结果=从C在客户
在c.LastName客户携手C2等于c2.LastName 
，其中c！= C2 
选择C; 
  

Customer customerOne = new Customer("John", "Doe");
Customer customerTwo = new Customer("Super", "Man");
Customer customerThree = new Customer("Crazy", "Guy");
Customer customerFour = new Customer("Jane", "Doe");
Customer customerFive = new Customer("Bat", "Man");

List<Customer> customers = new List<Customer>();
customers.Add(customerOne);
customers.Add(customerTwo);
customers.Add(customerThree);
customers.Add(customerFour);
customers.Add(customerFive);

What LINQ query would return an enumerable for all customers with the same last name?

Results should include one instance of: John Doe, Jane Doe, Super Man, and Bat Man

解决方案

    var result = from c in customers
                 join c2 in customers on c.LastName equals c2.LastName
                 where c != c2
                 select c;

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