Windows 8开发入门（二十一） Windows 8 下进行MVVM开发

在本文中将演示如何在Windows 8进行MVVM开发，首先我们准备两个辅助类如下：

ViewModeBase类 ：

public class ViewModeBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        /// <summary>
        /// 属性变化时触发事件
        /// </summary>
        /// <param name="propertyName"></param>
        protected void OnPropertyChanged( string propertyName )
        {
            var handler = this.PropertyChanged;
            if ( handler != null )
            {
                handler( this, new PropertyChangedEventArgs( propertyName ) );
            }
        }
    }

DelegateCommand类：

public class DelegateCommand : ICommand
    {
        private readonly Action m_exeAction;
        private readonly Func<bool> m_canExeAction;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="executeAction"></param>
        /// <param name="canExecuteAction"></param>
        public DelegateCommand(Action executeAction, Func<bool> canExecuteAction)
        {
            m_exeAction = executeAction;
            m_canExeAction = canExecuteAction;
        }

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="executeAction"></param>
        /// <param name="canExecuteAction"></param>
        public DelegateCommand(Action executeAction)
            : this(executeAction, null)
        {
        }
        /// <summary>
        /// 判断是否执行操作
        /// </summary>
        /// <param name="parameter"></param>
        /// <returns></returns>
        public bool CanExecute(object parameter)
        {
            if (m_canExeAction != null)
            {
                return m_canExeAction();
            }
            return true;
        }
        /// <summary>
        /// 是否执行操作的变更发生时
        /// </summary>
        public event EventHandler CanExecuteChanged;

        /// <summary>
        /// 执行操作的内容，可以变为Action行为
        /// </summary>
        /// <param name="parameter"></param>
        public void Execute(object parameter)
        {
            if (CanExecute(parameter))
            {
                m_exeAction();
            }
        }

        protected void OnCanExecuteChanged(object sender, EventArgs args)
        {
            var handler = CanExecuteChanged;
            if ( handler != null )
            {
                handler( this, EventArgs.Empty );
            }
        }

        public void RaiseCanExecuteChanged()
        {
            OnCanExecuteChanged(this, EventArgs.Empty);
        }
    }

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