C# 绑定窗口起始位置

我试图让我的主窗口在启动时记住并恢复位置和大小。因此，我尝试将窗口的启动位置绑定到viewmodel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"
    ...>

运行应用程序时，我会得到一个System.Windows.Markup.XamlParseException和附加信息：无法在类型为“MainWindow”的“WindowsStartUpLocation”属性上设置“Binding”。“绑定”只能在DependencyObject的DependencyProperty上设置。

---

如何更正此错误？

您无法绑定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"

---

无法绑定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"

---

尝试使用附加行为，该行为允许您绑定

WindowStartupLocation

属性：

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

不是依赖属性，这意味着您无法绑定它。解决方案可以从

窗口派生，并创建依赖项属性，也可以使用附加行为。
尝试使用附加行为，该行为允许您绑定
窗口起始位置
属性：

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
不是依赖属性，这意味着您无法绑定它。解决方案可以是从
窗口
派生，创建依赖属性，或者使用附加行为。
Hmm问题似乎比我想象的更复杂。但是谢谢，我试试看：）嗯，这个问题似乎比我想的更复杂。但是谢谢，我会尝试一下：）@Lync特别尝试绑定属性以支持恢复窗口的启动位置。他不想硬编码。@Lync特别尝试绑定该属性以支持还原窗口的启动位置。他不想硬编码。