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C# 自定义特性实战:验证、插件注册和命令路由的完整实现

C# 自定义特性实战:验证、插件注册和命令路由的完整实现

[HttpGet][Authorize][Required] ——这些你在 ASP.NET Core 里每天用的特性,背后都是同一个机制:一个继承自 System.Attribute 的类、一段用反射读取它的运行时代码。理解这个机制之后,你可以给自己的代码加上同样的扩展点。

这篇文章从定义原则出发,完整展示如何在三个真实场景中构建和使用自定义特性:属性验证、插件注册和命令路由。

特性是什么,不是什么

特性是元数据,不是行为。它是一个继承自 System.Attribute 的类,可以附加在类、方法、属性、参数和程序集上。编译器在编译时把特性数据编码进程序集的元数据表,运行时不会有任何事情自动发生。

特性是被动的。它不拦截方法调用,不修改行为,不在附加时做任何事。只有当某段代码主动用反射去读取它时,它才产生效果。

这和 PostSharp 之类的 AOP 工具不同,也和 MethodImpl 这种会直接指示 JIT 的特性不同。你自己写的自定义特性通常都是纯元数据。

定义自定义特性类

每个自定义特性继承自 System.Attribute,并用 [AttributeUsage] 标注自身,控制它可以出现在哪里、能否重复应用:

[AttributeUsage(
    AttributeTargets.Property,
    AllowMultiple = false,
    Inherited = true)]
public sealed class RequiredAttribute : Attribute
{
    public string ErrorMessage { get; }

    public RequiredAttribute(string errorMessage = "This field is required.")
    {
        ErrorMessage = errorMessage;
    }
}

几条命名和设计规范:

• 类名以 Attribute 结尾。应用时可以省略后缀(写 [Required] 而不是 [RequiredAttribute]),但类名本身应该带后缀。

• 除非打算继承,否则加 sealed

• 构造函数参数必须是编译时常量:字面量、typeof()nameof() 或枚举值。变量和方法返回值不允许。

• 通过命名参数([MyAttr(Name = "foo")])设置的属性必须有 public setter。

AttributeUsage 的三个参数

[AttributeUsage] 控制三件事:

AttributeTargets 是一个标志枚举,指定允许应用的位置。常用值:

适用位置
Class 类声明
Method 方法声明
Property 属性声明
Parameter 方法/构造函数参数
Assembly 程序集级别
All 所有合法目标

可以组合:AttributeTargets.Class | AttributeTargets.Interface

AllowMultipletrue 时,同一特性可以多次应用在同一目标上。对路由模板、允许的角色列表、命令别名这类场景很有用。默认 false

Inheritedtrue 时,调用 GetCustomAttributes(inherit: true) 时会包含基类上的特性。默认 true,但注意这对属性和参数上的特性不生效,只对类和方法有效。

在各种代码元素上应用特性

// 在类上
[PluginMetadata("OrderProcessor", Version = "1.0")]
public sealed class OrderProcessorPlugin : IPlugin { }

// 在方法上
[Command("greet")]
public void HandleGreet(string name) { }

// 在属性上(可以叠加)
[Required("Name is required.")]
[MaxLength(100)]
public string Name { get; set; } = string.Empty;

// 在参数上
public void Process([NotNull] string input) { }

// 在程序集上(通常放在 AssemblyInfo.cs,命名空间外面)
[assembly: AssemblyVersion("1.0.0.0")]

AllowMultiple = true 的特性可以在同一目标上多次出现。

用反射读取特性

读取特性的主要 API 在 System.Reflection 里。TypeMethodInfoPropertyInfo 等都继承自 MemberInfo,都提供这些方法:

// 读取单个特性,找不到时返回 null
RequiredAttribute? attr = propertyInfo.GetCustomAttribute<RequiredAttribute>();

// 读取同类型的所有特性(AllowMultiple 场景)
IEnumerable<MaxLengthAttribute> allAttrs =
    propertyInfo.GetCustomAttributes<MaxLengthAttribute>();

// 读取全部特性,非泛型版本
object[] allRaw = propertyInfo.GetCustomAttributes(inherit: true);

inherit 参数决定是否包含基类成员上的特性,大多数验证场景传 true

实战一:属性验证

自定义特性最直接的用法是在属性上标注约束,再用一个 validator 在运行时检查:

[AttributeUsage(AttributeTargets.Property)]
public sealed class RequiredAttribute : Attribute
{
    public string ErrorMessage { get; init; } = "This field is required.";
}

[AttributeUsage(AttributeTargets.Property)]
public sealed class MaxLengthAttribute : Attribute
{
    public int Length { get; }
    public MaxLengthAttribute(int length) => Length = length;
}

读取并执行约束的 validator:

public static class ObjectValidator
{
    public static IReadOnlyList<string> Validate(object instance)
    {
        var errors = new List<string>();
        Type type = instance.GetType();

        foreach (PropertyInfo prop in type.GetProperties(
            BindingFlags.Public | BindingFlags.Instance))
        {
            object? value = prop.GetValue(instance);

            var required = prop.GetCustomAttribute<RequiredAttribute>();
            if (required is not null
                && string.IsNullOrWhiteSpace(value?.ToString()))
            {
                errors.Add($"{prop.Name}: {required.ErrorMessage}");
            }

            var maxLength = prop.GetCustomAttribute<MaxLengthAttribute>();
            if (maxLength is not null
                && value is string str
                && str.Length > maxLength.Length)
            {
                errors.Add(
                    $"{prop.Name}: Must be {maxLength.Length} characters or fewer.");
            }
        }

        return errors;
    }
}

使用方式:

public sealed class CreateOrderRequest
{
    [Required]
    [MaxLength(200)]
    public string CustomerName { get; init; } = string.Empty;

    [Required]
    public string ProductId { get; init; } = string.Empty;
}

var request = new CreateOrderRequest { CustomerName = "", ProductId = "P001" };
var errors = ObjectValidator.Validate(request);
// errors 包含: "CustomerName: This field is required."

FluentValidation、DataAnnotations 以及 .NET 生态里所有基于特性的验证框架,本质上都是这个循环。

实战二:插件注册

加载外部程序集时需要找出所有插件类型,特性扫描是比标记接口更干净的注册方式:

[AttributeUsage(
    AttributeTargets.Class,
    AllowMultiple = false,
    Inherited = false)]
public sealed class PluginMetadataAttribute : Attribute
{
    public string Name { get; }
    public string Description { get; init; } = string.Empty;
    public string Version { get; init; } = "1.0.0";

    public PluginMetadataAttribute(string name)
    {
        Name = name;
    }
}

扫描程序集发现所有插件:

public static IReadOnlyList<(Type Type, PluginMetadataAttribute Metadata)>
    DiscoverPlugins(Assembly assembly)
{
    return assembly.GetTypes()
        .Where(t => t.IsClass && !t.IsAbstract)
        .Select(t => (
            Type: t,
            Metadata: t.GetCustomAttribute<PluginMetadataAttribute>()))
        .Where(x => x.Metadata is not null)
        .Select(x => (x.Type, Metadata: x.Metadata!))
        .ToList();
}

一个插件实现:

[PluginMetadata(
    "OrderProcessor",
    Description = "Handles order processing pipeline",
    Version = "2.1.0")]
public sealed class OrderProcessorPlugin : IPlugin
{
    public void Execute(IPluginContext context) { /* ... */ }
}

这个模式不要求插件实现任何标记接口,注册信息(名称、版本、描述)直接附加在类型本身,扫描时一次性读取。

实战三:命令路由

CLI 工具和聊天机器人框架常用特性把字符串命令映射到处理方法:

[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
public sealed class CommandAttribute : Attribute
{
    public string Name { get; }
    public CommandAttribute(string name) => Name = name;
}

AllowMultiple = true 让同一方法可以绑定多个命令名。构建命令注册表:

public sealed class CommandRegistry
{
    private readonly Dictionary<string, MethodInfo> _commands =
        new(StringComparer.OrdinalIgnoreCase);
    private readonly object _handler;

    public CommandRegistry(object handler)
    {
        _handler = handler;

        foreach (MethodInfo method in handler.GetType()
            .GetMethods(BindingFlags.Public | BindingFlags.Instance))
        {
            foreach (var attr in method.GetCustomAttributes<CommandAttribute>())
            {
                _commands[attr.Name] = method;
            }
        }
    }

    public bool TryInvoke(string commandName, string[] args)
    {
        if (!_commands.TryGetValue(commandName, out MethodInfo? method))
        {
            return false;
        }

        method.Invoke(_handler, new object[] { args });
        return true;
    }
}

处理器类:

public sealed class BotCommandHandler
{
    [Command("help")]
    [Command("?")]  // AllowMultiple = true 才允许这样写
    public void HandleHelp(string[] args)
    {
        Console.WriteLine("Available commands: help, greet, status");
    }

    [Command("greet")]
    public void HandleGreet(string[] args)
    {
        string name = args.Length > 0 ? args[0] : "World";
        Console.WriteLine($"Hello, {name}!");
    }
}

HandleHelp 同时响应 help? 两个命令名,这是 AllowMultiple = true 的直接体现。

热路径要缓存反射结果

GetCustomAttribute<T>() 每次调用都会扫描成员的元数据。在验证场景中,如果每秒要验证数千个对象,这个开销会积累起来。

解决方法:按 TypeMemberInfo 缓存结果:

public static class AttributeCache
{
    private static readonly ConcurrentDictionary<PropertyInfo, RequiredAttribute?>
        _required = new();

    public static RequiredAttribute? GetRequired(PropertyInfo prop)
        => _required.GetOrAdd(
            prop,
            static p => p.GetCustomAttribute<RequiredAttribute>());
}

第一次调用时通过反射读取,结果存入 ConcurrentDictionary。后续调用直接返回缓存值,不再走反射。这个模式适用于所有在热路径里读取特性的场景。

也可以在类型首次被验证时一次性扫描所有属性上的特性,把结果存进一个按 Type 索引的静态字典,比逐属性缓存更彻底。

源代码生成器:在编译期处理特性

反射读取特性是运行时操作,每次都有开销。.NET 的 Roslyn 源代码生成器让你在编译期处理特性并生成代码,运行时完全不需要反射。

选哪种方式取决于场景:

• 插件系统:类型在运行时从外部程序集动态加载,只能用反射。

• 你自己控制的类型:如果所有类型都是源代码形式、性能要求高,源代码生成器更合适。

源代码生成器更复杂,需要实现 IIncrementalGenerator,但生成的代码没有任何反射开销。性能敏感的框架(如 AOT 场景)通常会这样做。

几个常见问题

特性的构造函数可以传变量吗:不可以。必须是编译时常量:字符串字面量、数值字面量、typeof()nameof() 或枚举值。原因是编译器在编译时就把参数编码进元数据,这时还不存在运行时值。

应用了不允许的特性会怎样:编译时报错。C# 编译器会检查 AttributeUsage 限定的范围,如果你把一个只允许用在属性上的特性用在方法上,编译器会拒绝并提示类似 Attribute 'RequiredAttribute' is not valid on this declaration type. 的错误。

只想检查特性是否存在,不需要读取数据怎么做:用 IsDefined,比 GetCustomAttribute 稍快:

bool hasRequired = propertyInfo.IsDefined(
    typeof(RequiredAttribute),
    inherit: true);

GetCustomAttribute 是线程安全的吗:是的。.NET 的反射 API 读取元数据是线程安全的,程序集加载后元数据是只读的,多个线程可以并发读取同一个 MemberInfo 上的特性。

基类上的特性怎么读取:调用 GetCustomAttributesIsDefined 时传 inherit: true,反射会遍历继承链包含基类成员上的特性。注意这只对类和方法有效,PropertyInfo.GetCustomAttributes(inherit: true) 不会自动遍历基类属性链。

结语

C# 自定义特性的核心模式三步:继承 Attribute 定义类、用 [AttributeUsage] 限定范围、运行时用 GetCustomAttribute<T>() 读取。

验证、插件注册和命令路由覆盖了大多数真实场景,它们的核心代码结构都一样:获取类型的成员,检查每个成员上有没有目标特性,根据特性数据执行逻辑。

热路径里要缓存反射结果。类型源代码可控且性能要求高时,考虑把反射替换为源代码生成器。特性本身是被动的——在你主动读取它们之前,什么都不会发生。

如果你关注 C#、.NET 开发实践和工具效率,可以关注 Aide Hub。这里会持续分享能落地的技术教程和工程经验。

参考

• Custom Attributes in C#: Build, Apply, and Read Them with Reflection: https://www.devleader.ca/2026/05/23/custom-attributes-in-c-build-apply-and-read-them-with-reflection

• Reflection in C#: 4 Simple But Powerful Code Examples: https://www.devleader.ca/2024/02/26/reflection-in-c-4-simple-but-powerful-code-examples

• Plugin Architecture in C#: The Complete Guide to Extensible .NET Applications: https://www.devleader.ca/2026/04/07/plugin-architecture-in-c-the-complete-guide-to-extensible-net-applications

• Source Generation vs Reflection in Needlr: https://www.devleader.ca/2026/02/07/source-generation-vs-reflection-in-needlr-choosing-the-right-approach

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  1. CONNECT:[ UseTime:0.000704s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000755s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002129s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000866s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001555s ]
  6. SELECT * FROM `set` [ RunTime:0.000607s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001572s ]
  8. SELECT * FROM `article` WHERE `id` = 774857 LIMIT 1 [ RunTime:0.001158s ]
  9. UPDATE `article` SET `lasttime` = 1781953262 WHERE `id` = 774857 [ RunTime:0.023251s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000647s ]
  11. SELECT * FROM `article` WHERE `id` < 774857 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001085s ]
  12. SELECT * FROM `article` WHERE `id` > 774857 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002495s ]
  13. SELECT * FROM `article` WHERE `id` < 774857 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002162s ]
  14. SELECT * FROM `article` WHERE `id` < 774857 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003864s ]
  15. SELECT * FROM `article` WHERE `id` < 774857 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002487s ]
0.220257s