.Net Object Proxy

proxy.cs

void Main()
{
	var fooInstance = new FooImpl();
	var proxy = DispatchProxy.Create<IFoo, FooProxy>();
		
	dynamic p = proxy;
	p.SetTarget(fooInstance);
	var s = proxy.Bar(123);

	Console.WriteLine(s);
}


interface IFoo
{
	string Bar(int boo);
}

class FooImpl : IFoo
{
	public string Bar(int boo)
	{
		return $"Value {boo} was passed";
	}
}



class FooProxy : DispatchProxy
{
	private object target;

	public void SetTarget(object target)
	{
		this.target = target;
	}
	
	public FooProxy()
	{
		
	}

	protected override object Invoke(MethodInfo targetMethod, object[] args)
	{
		args[0]=987;
		return targetMethod.Invoke(target, args);
	}
}

need install "System.Reflection.DispatchProxy" NuGet package