csharp-linqmerge

C# Linq合并List中的对象

static void Main(string[] args){

	List<Person> pList = new List<Person>();

	Person person1 = new Person() { FirstName = "john", LastName = "wonder" };
	Person person3 = new Person() { FirstName = "john2", LastName = "wonder22" };
	Person person4 = new Person() { FirstName = "john2", LastName = "wonder2233" };

	pList.Add(person1);
	pList.Add(person3);
	pList.Add(person4);


    var pMergeList= pList.ToLookup(x => x.FirstName).Select(x => x.Aggregate((p1, p2) =>

        new Person{
             FirstName = p1.FirstName,
             LastName =  p1.LastName + ";"+ p2.LastName
        }
    )).ToList();

    foreach (var item in pMergeList)
    {
        Console.WriteLine("FirstName:" + item.FirstName);
        Console.WriteLine("LastName:" + item.LastName);

    }

    Console.Read();
	}


	class Person
	{
	    public string FirstName { get; set; }

	    public string LastName { get; set; }
	}


	class PersonModel
	{
	    public string FirstName { get; set; }

	    public string LastNameList { get; set; }
	}