Meeting.Demo/Demo.Common/Extensions/ObservableCollectionExtension.cs

using Demo.Common.Models;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo.Common.Extensions
{
    public static class ObservableCollectionExtension
    {
        public static void InitUserList<T>(this ObservableCollection<T> list, int count) where T : User
        {
            for (int i = 0; i < count; i++)
            {
                list.Add((T)User.GetInit());
            }
        }

        public static int AddUser<T>(this ObservableCollection<T> list, T user) where T : User
        {
            for (int i = 0; i < list.Count; i++)
            {
                if (list[i].Id == 0)
                {
                    list[i] = user;
                    return i;
                }
            }
            return -1;
        }

        public static int ClearUserById<T>(this ObservableCollection<T> list, long Id) where T : User
        {
            for (int i = 0; i < list.Count; i++)
            {
                if (list[i].Id == Id)
                {
                    list[i] = (T)User.GetInit(); 
                    return i;
                }
            }

            return -1;
        }

        public static void ClearAllUser<T>(this ObservableCollection<T> list) where T : User
        {
            for (int i = 0; i < list.Count; i++)
            {
                list[i] = (T)User.GetInit();
            }
        }
    }
}