如何使我的 DataService 与 ObservableCollection 保持同步？

Question

我有一个名为 CustomerService 的类，它只是从文件中读取客户集合或创建一个客户集合并将其传递回主模型视图，在主模型视图中将其转换为 ObservableCollection。确保 CustomerService 和 ObservableCollection 中的项目同步的最佳实践是什么。我猜我可以连接 CustomerService 对象来响应 RaisePropertyChanged，但这不是只能与 WPF 控件一起使用吗？有更好的办法吗？

using System;

public class MainModelView
{
    public MainModelView()
    {
        _customers = new ObservableCollection<CustomerViewModel>(new CustomerService().GetCustomers());
    }

    public const string CustomersPropertyName = "Customers"
    private ObservableCollection<CustomerViewModel> _customers;
    public ObservableCollection<CustomerViewModel> Customers
    {
        get
        {
            return _customers;
        }

        set
        {
            if (_customers == value)
            {
                return;
            }

            var oldValue = _customers;
            _customers = value;

            // Update bindings and broadcast change using GalaSoft.MvvmLight.Messenging
            RaisePropertyChanged(CustomersPropertyName, oldValue, value, true);
        }
    }
}

public class CustomerService
{
        /// <summary>
        /// Load all persons from file on disk.
        /// </summary>

        _customers = new List<CustomerViewModel>
                       {
                           new CustomerViewModel(new Customer("Bob", "" )),
                           new CustomerViewModel(new Customer("Bob 2", "" )),                           
                           new CustomerViewModel(new Customer("Bob 3", "" )),                       
                       };

        public IEnumerable<LinkViewModel> GetCustomers()
        {
            return _customers;
        }
}

Answer 1

处理“Customers”的CollectionChanged 事件。当它发生变化时，请致电您的服务以保持同步。

绑定“客户”时，请确保在 xaml 中指定“Mode=TwoWay”。