nosiema, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public class MappingModel
        {
            public long identifier { get; set; }
        }
        
        interface IChildInfo<T>{
            T nosiema {get;set;}
        }
        
        public static void Main(string[] args)
        {
            object temp = make();
            Console.WriteLine(temp.GetType().FullName);
            //temp is List<IChildInfo<long>>
        }
        
        static object make()
        {
            var propertyInfo = typeof(MappingModel).GetProperty("identifier");
            // get that property's type
            Type propertyType = propertyInfo.PropertyType;

// now that you have a property type you can make a specialized generic type:
            Type ichildtype = typeof(IChildInfo<>).MakeGenericType(propertyType);
            // create a type definition for that particular list
            Type listtype = typeof(List<>).MakeGenericType(ichildtype);
            // create an instance of that list
            return Activator.CreateInstance(listtype);
        } 
    }
}

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Compilation time: 0,16 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 13 Mb, average nr of threads: 3