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如何在c#中使用LINQ动态分组并计算合计和/最大值数据

在C#中使用LINQ动态分组并计算合计和/最大值数据,可以按照以下步骤进行:

  1. 导入命名空间:首先,在代码文件的顶部导入System.Linq命名空间,以便使用LINQ扩展方法。
代码语言:txt
复制
using System.Linq;
  1. 准备数据源:准备一个包含需要分组和计算的数据的集合,例如一个List或数组。
代码语言:txt
复制
List<Person> persons = new List<Person>
{
    new Person { Name = "Alice", Age = 25, Salary = 5000 },
    new Person { Name = "Bob", Age = 30, Salary = 6000 },
    new Person { Name = "Charlie", Age = 25, Salary = 5500 },
    new Person { Name = "David", Age = 35, Salary = 7000 },
    new Person { Name = "Eve", Age = 30, Salary = 6500 }
};
  1. 使用LINQ进行分组和计算:使用LINQ的GroupBy方法对数据进行分组,并使用聚合函数(如Sum、Max等)计算合计和/最大值数据。
代码语言:txt
复制
var result = persons
    .GroupBy(p => p.Age) // 按照年龄分组
    .Select(g => new
    {
        Age = g.Key,
        TotalSalary = g.Sum(p => p.Salary), // 计算总薪资
        MaxSalary = g.Max(p => p.Salary) // 计算最高薪资
    });
  1. 遍历结果:可以通过foreach循环遍历结果,并输出或处理每个分组的合计和/最大值数据。
代码语言:txt
复制
foreach (var group in result)
{
    Console.WriteLine($"Age: {group.Age}, Total Salary: {group.TotalSalary}, Max Salary: {group.MaxSalary}");
}

完整示例代码如下:

代码语言:txt
复制
using System;
using System.Collections.Generic;
using System.Linq;

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

public class Program
{
    public static void Main()
    {
        List<Person> persons = new List<Person>
        {
            new Person { Name = "Alice", Age = 25, Salary = 5000 },
            new Person { Name = "Bob", Age = 30, Salary = 6000 },
            new Person { Name = "Charlie", Age = 25, Salary = 5500 },
            new Person { Name = "David", Age = 35, Salary = 7000 },
            new Person { Name = "Eve", Age = 30, Salary = 6500 }
        };

        var result = persons
            .GroupBy(p => p.Age)
            .Select(g => new
            {
                Age = g.Key,
                TotalSalary = g.Sum(p => p.Salary),
                MaxSalary = g.Max(p => p.Salary)
            });

        foreach (var group in result)
        {
            Console.WriteLine($"Age: {group.Age}, Total Salary: {group.TotalSalary}, Max Salary: {group.MaxSalary}");
        }
    }
}

这样,你就可以在C#中使用LINQ动态分组并计算合计和/最大值数据了。

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