MyFirstMAUI/MyFirstMauiApp/UseRestService/ViewModels/AddPartViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UseRestService.Data;

namespace UseRestService.ViewModels
{
    public partial class AddPartViewModel : ObservableObject
    {
        [ObservableProperty]
        string _partID;

        [ObservableProperty]
        string _partName;

        [ObservableProperty]
        string _suppliers;

        [ObservableProperty]
        string _partType;

        public AddPartViewModel()
        {
        }

        [RelayCommand]
        async Task SaveData()
        {
            if (string.IsNullOrWhiteSpace(PartID))
                await InsertPart();
            else
                await UpdatePart();
        }


        [RelayCommand]
        async Task InsertPart()
        {
            await PartsManager.Add(PartName, Suppliers, PartType);

            WeakReferenceMessenger.Default.Send(new RefreshMessage(true));

            await Shell.Current.GoToAsync("..");
        }


        [RelayCommand]
        async Task UpdatePart()
        {
            Part partToSave = new()
            {
                PartID = PartID,
                PartName = PartName,
                PartType = PartType,
                Suppliers = Suppliers.Split(",").ToList()
            };

            await PartsManager.Update(partToSave);

            WeakReferenceMessenger.Default.Send(new RefreshMessage(true));

            await Shell.Current.GoToAsync("..");
        }

        [RelayCommand]
        async Task DeletePart()
        {
            if (string.IsNullOrWhiteSpace(PartID))
                return;

            await PartsManager.Delete(PartID);

            WeakReferenceMessenger.Default.Send(new RefreshMessage(true));

            await Shell.Current.GoToAsync("..");
        }

        [RelayCommand]
        async Task DoneEditing()
        {
            await Shell.Current.GoToAsync("..");
        }
    }
}