绑定窗口启动位置

本文关键字：位置 启动 窗口 绑定 | 更新日期: 2023-09-27 18:34:48

>我正在尝试使我的主窗口记住并在启动时恢复位置和大小。因此，我尝试将窗口的启动位置绑定到视图模型中的属性，如下所示：

<Window x:Class="MyApp.Views.MainWindow"
    ...
    Width="{Binding Width}"
    Height="{Binding Height}"
    WindowStartupLocation="{Binding WindowStartupLocation}"
    WindowState="{Binding WindowState}"
    MinHeight="600"
    MinWidth="800"
    Closing="OnWindowClosing"
    Closed="OnWindowClosed"
    ContentRendered="OnMainWindowReady"
    ...>

我的视图模型：

        ...
        // Default settings
        WindowState = (WindowState)FormWindowState.Normal;
        this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
        Width = 800;
        Height = 600;
        // check if the saved bounds are nonzero and is visible on any screen
        if (Properties.Settings.Default.WindowStartupLocation != Rectangle.Empty &&
            IsVisibleOnAnyScreen(Properties.Settings.Default.WindowStartupLocation))
        {
            this.WindowStartupLocation = WindowStartupLocation.Manual;
            this.WindowState = (WindowState)Properties.Settings.Default.WindowState;
            Height = Properties.Settings.Default.WindowStartupLocation.Size.Height;
            Width = Properties.Settings.Default.WindowStartupLocation.Size.Width;
            Left = Properties.Settings.Default.WindowStartupLocation.Left;
            Top = Properties.Settings.Default.WindowStartupLocation.Top;
        }
        ...

当我运行应用程序时，我得到一个System.Windows.Markup.XamlParseException和其他信息：不能在类型为"MainWindow"的"WindowStartupLocation"属性上设置"绑定"。"绑定"只能在依赖对象的依赖属性上设置。

我应该如何纠正？

绑定窗口启动位置

尝试使用允许您绑定 WindowStartupLocation 属性的附加行为：

namespace YourProject.PropertiesExtension
{
    public static class WindowExt
    {
        public static readonly DependencyProperty WindowStartupLocationProperty;
        public static void SetWindowStartupLocation(DependencyObject DepObject, WindowStartupLocation value)
        {
            DepObject.SetValue(WindowStartupLocationProperty, value);
        }
        public static WindowStartupLocation GetWindowStartupLocation(DependencyObject DepObject)
        {
            return (WindowStartupLocation)DepObject.GetValue(WindowStartupLocationProperty);
        }
        static WindowExt() 
        {            
            WindowStartupLocationProperty = DependencyProperty.RegisterAttached("WindowStartupLocation",
                                                      typeof(WindowStartupLocation),
                                                      typeof(WindowExt),
                                                      new UIPropertyMetadata(WindowStartupLocation.Manual, OnWindowStartupLocationChanged));
        }
        private static void OnWindowStartupLocationChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            Window window = sender as Window; 
            if (window != null) 
            {
                window.WindowStartupLocation = GetWindowStartupLocation(window);
            }
        }
    }
}

用法： 

<Window
  PropertiesExtension:WindowExt.WindowStartupLocation="{Binding ..}" />

正如错误所述，WindowStartupLocation不是依赖项，这意味着您无法绑定它。解决方案可以是派生自 Window 并创建依赖项属性，也可以使用附加行为。

您不能绑定 WindowsStartupLocation，此行将生成错误：

WindowStartupLocation="{Binding WindowStartupLocation}"

您可以将其设置为某个特定值，如下所示： 

WindowStartupLocation="CenterScreen"
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