转 WPF MVVM模式下关闭窗口的实现

转自https://www.cnblogs.com/XzcBlog/p/4876816.html

首先在nuget中找到

通过行为来实现

实现界面与逻辑的分离

窗口关闭行为：其中含有布尔型的Close属性，将相应的关闭行为绑定到该属性上，则可以实现窗口的关闭行为，从而实现VM与View的分离

  public class WindowCloseBehaviour : Behavior<Window>
    {
        public static readonly DependencyProperty CloseProperty =
          DependencyProperty.Register(
          "Close",
          typeof(bool),
          typeof(WindowCloseBehaviour),
          new FrameworkPropertyMetadata(
                    false,
                    OnCloseChanged));
 
        public bool Close
        {
            get { return (bool)GetValue(CloseProperty); }
            set { SetValue(CloseProperty, value); }
        }
 
        private static void OnCloseChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var window = ((WindowCloseBehaviour)d).AssociatedObject;
            var newValue = ((bool)e.NewValue);
            if (newValue)
            {
                window.Close();
            }
        }

View：
xmlns:event="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

而behaviors则是声明的WindowCloseBehaviour的命名空间

   <event:Interaction.Behaviors>
        <behaviors:WindowCloseBehaviour Close="{Binding IsWinClose}"/>
    </event:Interaction.Behaviors>

ViewModel：

        private bool _isWinClose;
        /// <summary>
        /// 指示窗口是否关闭
        /// </summary>
        public bool IsWinClose
        {
            get { return _isWinClose; }
            set
            {
                _isWinClose = value;
                OnPropertyChanged("IsWinClose");
 
                //窗口关闭则重置窗口状态
                if (IsWinClose)
                {
                    ResetWindowCloseState();
                }
            }
        }
 
        //重置窗口状态
        private void ResetWindowCloseState()
        {
            IsWinClose = false;
        }