image.png
using System;
using System.Collections.Generic;
using System.Linq;
public class MyData
{
public string Field1 { get; set; }
public string Field2 { get; set; }
}
class Program
{
static void Main()
{
// 创建包含数据的列表
List<MyData> dataList = new List<MyData>
{
new MyData { Field1 = "A", Field2 = "X" },
new MyData { Field1 = "B", Field2 = "Y" },
new MyData { Field1 = "A", Field2 = "X" },
new MyData { Field1 = "B", Field2 = "Z" },
new MyData { Field1 = "C", Field2 = "Y" }
};
// 使用LINQ进行分组和统计
var groupedData = dataList.GroupBy(item => new { item.Field1, item.Field2 })
.Select(group =>
{
group.First().Field2 = string.Join(", ", group.Select(item => item.Field2));
return group.First();
}).ToList();
// 输出结果
foreach (var group in groupedData)
{
Console.WriteLine($"Field1: {group.Field1}, Field2: {group.Field2}");
}
}
}
