如何在C#中对列表进行排序[重复]

Question

我有一堂课：

public class MyObject
{
public string Name;
public int Age;
}

我有一个 Myobject 对象列表：

Name Age
ABC 12
BBC 14
ABC 11

如何根据条件对该列表进行排序：先排序名称，然后再排序年龄。有了这个列表，排序后的结果：

Name Age
ABC 11
ABC 12
BBC 14

Answer 1

使用 LINQ 的两种不同方式：

1) 使用OrderBy 和ThenBy：

l = l.OrderBy(x => x.Name).ThenBy(x => x.Age).ToList();

2) 使用查询语法：

l = (from x in l
     orderby x.Name, x.Age
     select x).ToList();

Answer 2

class Program
{
    static void Main(string[] args)
    {
        var list = new List<MyObject>(new[]
        {
            new MyObject { Name = "ABC", Age = 12 },
            new MyObject { Name = "BBC", Age = 14 },
            new MyObject { Name = "ABC", Age = 11 },
        });
        var sortedList = from element in list
                         orderby element.Name
                         orderby element.Age
                         select element;

        foreach (var item in sortedList)
        {
            Console.WriteLine("{0} {1}", item.Name, item.Age);
        }
    }
}

Answer 3

使用System.Linq 可以轻松实现：

list = list.OrderBy(e=>e.Name).ThenBy(e=>e.Age);

同时检查这个答案：Sorting a list using Lambda/Linq to objects。

Answer 4

您可以使用 LINQ 执行以下操作：

class Program
{
    static void Main(string[] args)
    {
        List<MyObject> list = new List<MyObject>();

        list.Add(new MyObject() { Age = 12, Name = "ABC" });
        list.Add(new MyObject() { Age = 11, Name = "ABC" });
        list.Add(new MyObject() { Age = 14, Name = "BBC" });

        var sorted = list.OrderBy(mo => mo.Name).ThenBy(mo => mo.Age);

        foreach (var myObject in sorted)
        {
            Console.WriteLine(string.Format("{0} - {1}",
                              myObject.Name, myObject.Age));
        }
    }
}

Answer 5

您可以将一个新对象传递给 Order By，以便它按那个排序

class Program
{
    static void Main(string[] args)
    {
        var list = new List<MyObject>(new[]
        {
            new MyObject { Name = "ABC", Age = 12 },
            new MyObject { Name = "BBC", Age = 14 },
            new MyObject { Name = "ABC", Age = 11 },
        });
        var sortedList = list.OrderBy( x => new { x.Name , x.Age });

        foreach (var item in sortedList)
        {
            Console.WriteLine("{0} {1}", item.Name, item.Age);
        }
    }
}