using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var database = new Database();

        var dbType = database.GetType();

        var getChangesMethod = dbType.GetMethod("GetChanges");

        foreach(var type in dbType.GetProperties().Select(p => p.PropertyType).Where(t => t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Set<>)).Select(t => t.GenericTypeArguments.First()))

        {

            var concrateGetChangesMethod =  getChangesMethod.MakeGenericMethod(type);

            concrateGetChangesMethod.Invoke(database, null);

        }

    }

​

    public class Alarm { }

    public class Area { }

​

    public class Database

    {

        public Set<Alarm> Alarms { get; set; }

        public Set<Area> Areas { get; set; }

        public int Other { get; set; }

​

        public void GetChanges<T>()

        {

            Console.WriteLine("GetChanges for type: " + typeof(T).Name);

        }

    }

​

    public class Set<T>

    {

​

    }

}