Idea for intercepting an indirection.

PList`1.cs

using System.ComponentModel;
using Urasandesu.Prig.Framework;

namespace System.Collections.Generic.Prig
{
    public class PList<T> : PListBase 
    {
        public static zzAdd Add() 
        {
            return new zzAdd();
        }

        [EditorBrowsable(EditorBrowsableState.Never)]
        public class zzAdd 
        {
            public IndirectionAction<List<T>, T> Body
            {
                set
                {
                    var info = new IndirectionInfo();
                    info.AssemblyName = "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";
                    info.Token = TokenOfAdd_T;
                    var indirections = LooseCrossDomainAccessor.GetOrRegister<IndirectionHolder<IndirectionAction<List<T>, T>>>();
                    var _value = value;
                    _value = (List<T> arg1, T arg2) =>
                    {
                        var interceptions = default(InterceptionHolder<IndirectionAction<List<T>, T>>);
                        if (LooseCrossDomainAccessor.TryGet(out interceptions))
                        {
                            var intercepted = default(IndirectionAction<List<T>, T>);
                            if (interceptions.TryGet(info, out intercepted))
                            {
                                intercepted(arg1, arg2);
                                return;
                            }
                        }
                        value(arg1, arg2);
                    };
                    indirections.AddOrUpdate(info, _value);
                }
            }
        }
    }
}