轻量级 AOP 动态代理，支持 .NetCore 或 .NetFramework4.0+ 平台。
dotnet add package FreeSql.DynamicProxy
1、定义拦截器
class CustomAttribute : FreeSql.DynamicProxyAttribute
{
[FreeSql.DynamicProxyFromServices]
IServiceProvider _service;
public override Task Before(FreeSql.DynamicProxyBeforeArguments args)
{
Console.WriteLine($"{args.MemberInfo.Name} Before");
return base.Before(args);
}
public override Task After(FreeSql.DynamicProxyAfterArguments args)
{
Console.WriteLine($"{args.MemberInfo.Name} After");
return base.After(args);
}
}- 拦截器和特性一起定义，合二为一；
- 私有字段可从Ioc反转获得对象，如上面的 _service；
2、开始拦截
public class CustomRepository
{
[Custom]
public virtual string Get(string key)
{
Console.WriteLine($"CustomRepository Get");
return $"CustomRepository.Get({key}) value";
}
}- 拦截的方法须使用修饰符 virtual；
3、Before/After 参数说明
- Before args
| Property | Type | Notes |
|---|---|---|
| Sender | Object | 代理对象 |
| InjectorType | Enum | Method, PropertyGet, PropertySet |
| MemberInfo | MemberInfo | 反射信息 |
| Parameters | Dictionary<string, object> | 方法的参数列表 |
| ReturnValue | Object | 设置方法的返回值 |
拦截并修改方法的参数值： args.Parameters["key"] = "NewKey";
拦截方法的返回值：args.ReturnValue = "NewValue";
- After args
| Property | Type | Notes |
|---|---|---|
| Sender | Object | 代理对象 |
| InjectorType | Enum | Method, PropertyGet, PropertySet |
| MemberInfo | MemberInfo | 反射信息 |
| Parameters | Dictionary<string, object> | 方法的参数列表 |
| ReturnValue | Object | 获取方法的返回值 |
| Exception | Exception | 原方法执行的异常对象 |
| ExceptionHandled | bool | 控制原方法执行发生异常后的行为 |
ExceptionHandled：False: 抛出异常 (默认), True: 忽略异常 (继续执行)
4、AspNetCore 环境
第一步. 修改 Program.cs
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
})
.UseServiceProviderFactory(new FreeSql.DynamicProxyServiceProviderFactory());
}第二步. 注入 CustomRepository
public void ConfigureServices(IServiceCollection services)
{
services.AddScoped<CustomRepository>();
}第三步. 创建 Controller
public class ValuesController : ControllerBase
{
[HttpGet("1")]
public string Get([FromServices]CustomRepository repo, [FromQuery]string key)
{
return repo.Get(key);
}
}第四步. 控制台输出
Get Before
CustomRepository Get
Get After5、动态接口实现
var api = DynamicProxy.Resolve<IUserApi>();
Console.WriteLine(api.Get("001"));
public interface IUserApi
{
[HttpGet("api/user")]
string Get(string id);
}
class HttpGetAttribute : FreeSql.DynamicProxyAttribute
{
string _url;
public HttpGetAttribute(string url)
{
_url = url;
}
public override Task Before(FreeSql.DynamicProxyBeforeArguments args)
{
args.ReturnValue = $"{args.MemberInfo.Name} HttpGet {_url}";
return base.Before(args);
}
}
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