using AspectCore.DynamicProxy;
 
public class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Start...");
        ProxyGeneratorBuilder proxyGeneratorBuilder = new ProxyGeneratorBuilder();
        using (IProxyGenerator proxyGenerator = proxyGeneratorBuilder.Build())
        {
            Person p = proxyGenerator.CreateClassProxy<Person>();
            Console.WriteLine(p.GetType().BaseType);
            p.Say($"{Environment.NewLine} Hello World!");
        }
        Console.WriteLine("End");
        Console.ReadLine();
    }
}
 
public class CustomInterceptor : AbstractInterceptorAttribute
{
    public async override Task Invoke(AspectContext context, AspectDelegate next)
    {
        try
        {
            Console.WriteLine("Before service call");
            await next(context);
        }
        catch (Exception)
        {
            Console.WriteLine("Service threw an exception!");
            throw;
        }
        finally
        {
            Console.WriteLine("After service call");
        }
    }
}
 
public class Person
{
    [CustomInterceptor]
    public virtual void Say(string msg)
    {
        Console.WriteLine("service calling..." + msg);
    }
}

public class CustomInterceptor : AbstractInterceptorAttribute
{
    public async override Task Invoke(AspectContext context, AspectDelegate next)
    {
        try
        {
            Console.WriteLine("Before service call");
            if (false)
                await next(context);
            else
                await Task.Delay(1000);
        }
        catch (Exception)
        {
            Console.WriteLine("Service threw an exception!");
            throw;
        }
        finally
        {
            Console.WriteLine("After service call");
        }
    }
}