WPF通过附加属性控制窗口关闭

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