AIMS_BD_IATI.DAL.AimsDbIatiDAL.PrepareMappedActivities C# (CSharp) Метод

        private List<ProjectFieldMapModel> PrepareMappedActivities(List<iatiactivity> iatiActivities, Activity a, AimsDAL aimsDAL)
        {
            //step 1: project structure
            var iactivities = new List<iatiactivity>();
            if (a.Hierarchy == 1)
                iactivities = ImportLogic.LoadH1ActivitiesWithChild(iatiActivities); // here pass all activities to find out their child activities
            else
                iactivities = ImportLogic.LoadH2ActivitiesWithParent(iatiActivities);

            //step 2: get mapped iatiActivity and aimsProject
            var iatiActivity = iactivities.Find(f => f.IatiIdentifier == a.IatiIdentifier);
            // SetExchangedValues
            SetExchangedValues(iatiActivity);
            iatiActivity.childActivities.ForEach(ra => SetExchangedValues(ra));

            var aimsProject = new iatiactivity();
            if (a.ProjectId > 0)
            {
                aimsProject = aimsDAL.GetAIMSProjectInIATIFormat(a.ProjectId);
            }
            else if (a.MappedProjectId > 0) //for co-finance projects
            {
                aimsProject = aimsDAL.GetAIMSProjectInIATIFormat(a.MappedProjectId);
            }

            //step 3: get general preference
            var generalPreference = GetFieldMappingPreferenceGeneral(a.OrgId);

            //step 4: create a ProjectFieldMapModel using iatiActivity, aimsProject and generalPreference
            var ProjectFieldMapModel = new ProjectFieldMapModel(iatiActivity, aimsProject, generalPreference);

            //step 5: SetFieldMappingPreferences
            var ProjectFieldMapModels = new List<ProjectFieldMapModel>(); // here we make a list just to use existing method (e.g existing method require a List parameter)
            ProjectFieldMapModels.Add(ProjectFieldMapModel);

            ImportLogic.SetFieldMappingPreferences(ProjectFieldMapModels, ProjectFieldMapModel);
            return ProjectFieldMapModels;
        }