DispatchProxy and dynamic proxy AOP

DispatchProxy dynamic proxy class is under DotnetCore class, source address: Github , official documents: the MSDN . Mainly Activator and AssemblyBuilder to achieve, to achieve AOP framework Dora's garden Jiang boss also provided extensive use of these two, but DispatchProxy implementation more simple.

AOP implementations:

#region 动态代理 dispatchproxy aop示例
class GenericDecorator : DispatchProxy
{
    public object Wrapped { get; set; }
    public Action<MethodInfo, object[]> Start { get; set; }
    public Action<MethodInfo, object[], object> End { get; set; }

    protected override object Invoke(MethodInfo targetMethod, object[] args)
    {
        Start(targetMethod, args);
        object result = targetMethod.Invoke(Wrapped, args);
        End(targetMethod, args, result);
        return result;
    }
}

interface IEcho
{
    void Echo(string message);
    string Method(string info);
}

class EchoImpl : IEcho
{
    public void Echo(string message) => Console.WriteLine($"Echo参数：{message}");

    public string Method(string info)
    {
        Console.WriteLine($"Method参数：{info}");
        return info;
    }
}
#endregion

transfer:

static void EchoProxy()
{
    var toWrap = new EchoImpl();
    var decorator = DispatchProxy.Create<IEcho, GenericDecorator>();
    ((GenericDecorator)decorator).Wrapped = toWrap;
    ((GenericDecorator)decorator).Start = (tm, a) => Console.WriteLine($"{tm.Name}({string.Join(',', a)})方法开始调用");
    ((GenericDecorator)decorator).End = (tm, a, r) => Console.WriteLine($"{tm.Name}({string.Join(',', a)})方法结束调用，返回结果{r}");
    decorator.Echo("Echo");
    decorator.Method("Method");
}

DispatchProxy is an abstract class, we customize a class derived from the class, you can rely on the establishment of a proxy class and proxy interfaces by the Create method. result:

DispatchProxy and dynamic proxy AOP

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