借助 C# 14 特性强化 .NET 后端数据验证的深度实践

public class UserRegistration
{
    public string Username { get; set; }
    public string Email { get; set; }
    public int Age { get; set; }
}

public class UserValidator
{
    public static bool Validate(UserRegistration user)
    {
        return user is { 
            Username: { Length: >= 3 }, 
            Email: { Length: >= 5, Contains: "@" }, 
            Age: >= 18 
        };
    }
}

class Program
{
    static void Main()
    {
        var validUser = new UserRegistration
        {
            Username = "testuser",
            Email = "test@example.com",
            Age = 20
        };

        var invalidUser = new UserRegistration
        {
            Username = "te",
            Email = "testexample.com",
            Age = 16
        };

        Console.WriteLine($"Valid user: {UserValidator.Validate(validUser)}");
        Console.WriteLine($"Invalid user: {UserValidator.Validate(invalidUser)}");
    }
}

public static void ProcessUsers<T>(List<T> users) where T : notnull
{
    foreach (var user in users)
    {
        // 处理用户逻辑，不用担心空引用
        Console.WriteLine($"Processing user: {user}");
    }
}

class Program
{
    static void Main()
    {
        var userList = new List<string> { "user1", "user2" };
        ProcessUsers(userList);
    }
}