WPF通过附加属性控制窗口关闭

标签：typeof   microsoft   binding   ble   ima   form   pat   sof   消息   

场景1

当使用 ShowDialog() 方式显示窗口时，通过定义附加属性的方式可实现在 ViewModel 中进行数据绑定(bool?)来控制子窗口的显示和关闭

public class ExWindow
{
    public static bool? GetDialogResult(DependencyObject obj)
    {
        return (bool?)obj.GetValue(DialogResultProperty);
    }

    public static void SetDialogResult(DependencyObject obj, bool value)
    {
        obj.SetValue(DialogResultProperty, value);
    }

    // Using a DependencyProperty as the backing store for DialogResult.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty DialogResultProperty =
        DependencyProperty.RegisterAttached("DialogResult", typeof(bool?), typeof(ExWindow), new PropertyMetadata(true, (d, e) =>
        {
            var handler = d as Window;
            handler.DialogResult = e.NewValue as bool?;
        }));
}

• 参考地址：
  • Getting “DialogResult can be set only after Window is created and shown as dialog” when implementing WPF MVVM pattern for form closing
  • DialogResult can be set only after Window is created and shown as dialog

场景2

当主窗口的显示和关闭也想通过在 ViewModel 中来进行控制的话可以通过事件和消息级制来实现，具体可参考 MVVM Light 中的 Messenger 使用方式

WPF通过附加属性控制窗口关闭

标签：typeof   microsoft   binding   ble   ima   form   pat   sof   消息   

原文地址：https://www.cnblogs.com/lonelyxmas/p/10129760.html