Demo/Data/Repository/GroupRepositoryImpl.cs

using Demo.Data.LocalData;
using Demo.domain.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo.Data.Repository
{
    public class GroupRepositoryImpl
    {
        public GroupRepositoryImpl() {

            GetAllGroups = LocalStaticData.groups;
        }
        public List<GroupLocalEntity> GetAllGroups
        { get; set; }

        public GroupLocalEntity? UpdateGroupName(GroupLocalEntity groupUpdateLocalEntity) {

            int index = GetAllGroups.FindIndex(x => x.Id == groupUpdateLocalEntity.Id);
            if (index == -1) return null;
            GetAllGroups[index].Name = groupUpdateLocalEntity.Name;
            return GetAllGroups[index];
        }

        public GroupLocalEntity? CreateGroup(GroupLocalEntity groupCreateLocalEntity) {
            
            if (GetAllGroups.Any(x => x.Id == groupCreateLocalEntity.Id)) return null;

            GetAllGroups.Add(groupCreateLocalEntity);
            return groupCreateLocalEntity;
        }
    }
}