编辑“︁C Sharp LINQ 聚合”︁（章节）

== 实际应用案例 ==

=== 案例1：电商订单统计 ===

假设有一个订单列表，我们需要计算总销售额、平均订单金额和最大订单金额：

<syntaxhighlight lang="csharp">
public class Order
{
    public int OrderId { get; set; }
    public decimal Amount { get; set; }
}

List<Order> orders = new List<Order>
{
    new Order { OrderId = 1, Amount = 100.50m },
    new Order { OrderId = 2, Amount = 75.25m },
    new Order { OrderId = 3, Amount = 150.00m }
};

// 总销售额
decimal totalSales = orders.Sum(o => o.Amount);

// 平均订单金额
decimal averageOrder = orders.Average(o => o.Amount);

// 最大订单金额
decimal maxOrder = orders.Max(o => o.Amount);
</syntaxhighlight>

=== 案例2：学生成绩分析 ===

分析学生成绩数据，找出最高分、最低分和平均分：

<syntaxhighlight lang="csharp">
var studentScores = new[]
{
    new { Name = "Alice", Score = 85 },
    new { Name = "Bob", Score = 92 },
    new { Name = "Charlie", Score = 78 }
};

var analysis = new
{
    HighestScore = studentScores.Max(s => s.Score),
    LowestScore = studentScores.Min(s => s.Score),
    AverageScore = studentScores.Average(s => s.Score)
};
</syntaxhighlight>