Question

我有一个名为CustomerService的类，它只是从文件中读取客户的集合或创建一个客户，然后将其传递回主模型视图，并将其转换为ObservableCollection。确保CustomerService和ObservableCollection中的项目保持同步的最佳做法是什么。我猜我可以连接CustomerService对象来响应RaisePropertyChanged，但这不仅仅是用于WPF控件吗？还有更好的方法吗？

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“客户”的CollectionChanged事件。如果更改，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”。

如何使用ObservableCollection使DataService保持最新状态？

1 个答案: