C# 匿名类型的使用小结

var person = new { Name = "Alice", Age = 30 };
Console.WriteLine($"{person.Name} is {person.Age} years old.");
// 输出：Alice is 30 years old.

string productName = "Laptop";
decimal price = 999.99m;

var product = new { productName, price };
Console.WriteLine($"{product.productName}: {product.price:C}");
// 输出：Laptop: $999.99

var person = new { Name = "Alice", Age = 30 };
// 不能写成：AnonymousType person = ...  // 类型名不存在

var words = new[] { "apple", "blueberry", "cherry" };

var results = words.Select(w => new { Word = w, Length = w.Length });

foreach (var item in results)
    Console.WriteLine($"{item.Word} has {item.Length} letters.");

// 输出：
// apple has 5 letters.
// blueberry has 9 letters.
// cherry has 6 letters.

var a = new { Name = "Alice", Age = 30 };
var b = new { Name = "Alice", Age = 30 };
var c = new { Name = "Bob", Age = 25 };

Console.WriteLine(a.Equals(b));  // True —— 相同类型、相同值
Console.WriteLine(a.Equals(c));  // False —— 值不同

var order = new
{
    OrderId = 1,
    Customer = new { Name = "Alice", City = "Seattle" },
    Total = 150.00m
};

Console.WriteLine($"Order {order.OrderId} for {order.Customer.Name} in {order.Customer.City}");
// 输出：Order 1 for Alice in Seattle