c#中g(shù)roup如何對(duì)數(shù)據(jù)進(jìn)行分組

c#
小樊
81
2024-09-20 07:59:05

在C#中，你可以使用LINQ（Language Integrated Query）對(duì)數(shù)據(jù)進(jìn)行分組。以下是一個(gè)簡(jiǎn)單的示例，演示了如何使用GroupBy方法對(duì)數(shù)據(jù)進(jìn)行分組：

using System;
using System.Collections.Generic;
using System.Linq;

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

class Program
{
    static void Main()
    {
        List<Person> people = new List<Person>
        {
            new Person { Name = "Alice", Age = 30 },
            new Person { Name = "Bob", Age = 25 },
            new Person { Name = "Charlie", Age = 30 },
            new Person { Name = "David", Age = 25 },
            new Person { Name = "Eva", Age = 35 }
        };

        // 使用GroupBy方法對(duì)數(shù)據(jù)進(jìn)行分組
        var groupedPeople = people.GroupBy(p => p.Age);

        // 遍歷分組后的數(shù)據(jù)
        foreach (var group in groupedPeople)
        {
            Console.WriteLine($"Age: {group.Key}");
            foreach (var person in group)
            {
                Console.WriteLine($"Name: {person.Name}, Age: {person.Age}");
            }
        }
    }
}

在這個(gè)示例中，我們創(chuàng)建了一個(gè)Person類，并創(chuàng)建了一個(gè)包含Person對(duì)象的列表。然后，我們使用GroupBy方法根據(jù)年齡對(duì)人員進(jìn)行分組。最后，我們遍歷分組后的數(shù)據(jù)并輸出每個(gè)分組的信息。

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