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深入理解 LINQ：分组、匿名类型、扩展方法与 Lambda 表达式

1. LINQ 分组与 group 关键字

LINQ 的分组功能是一项强大特性，它允许我们根据指定的键值将序列分割成多个组。以下是一个分组查询的示例：

using System; using System.Collections.Generic; using System.Linq; namespace Programming_CSharp { // Customer address class public class Address { // Same as in Example 13-3 } // Main program public class Tester { static void Main( ) { List<Address> addresses = CreateAddressList( ); // Find addresses grouped by customer name var result = from address in addresses group address by address.Name; foreach (var group in result) { Console.WriteLine("{0}",