Question

我有一个MainView窗口，其宽度和高度我试图从它的Code-Behind类绑定。

<Window x:Class="RpP25.MainView"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:shared="http://schemas.actiprosoftware.com/winfx/xaml/shared"     
   xmlns:docking="http://schemas.actiprosoftware.com/winfx/xaml/docking"
   xmlns:themes="http://schemas.actiprosoftware.com/winfx/xaml/themes"
   xmlns:RpWin="clr-namespace:RpP25"
   xmlns:RpWinCmds="clr-namespace:RpP25.Commands"
   xmlns:diagnostics="clr-namespace:System.Diagnostics;assembly=WindowsBase"
   Title="{Binding Path=FileName, Converter={StaticResource WindowTitleNameConverter}}"
   Height="{Binding Path=WindowHeight, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"
   Width="{Binding Path=WindowWidth, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"
   Icon="images/CobWhite.ico"
   Loaded="Window_Loaded"
   Closing="Window_Closing">

后面的代码具有属性，并且还通过ViewModel MainVM设置datacontext。

public partial class MainView : Window, INotifyPropertyChanged
{
    // Constant Fields
    private const double windowDefaultWidth_ = 720;
    private const double windowDefaultHeight_ = 400;

    // Private Fields
    private RegistryKey RegKey_;                                // Registry Key to hold Registry Subkey
    private WindowState windowState_ = WindowState.Normal;   // Display State of the MainWindow (Min,Max or Normal)
    private double windowWidth_ = windowDefaultWidth_;    // Width of the MainWindow
    private double windowHeight_ = windowDefaultHeight_;  // Height of the MainWindow

    #region Constructors

    public MainView()
    {
        InitializeComponent();
        DataContext = new MainVM();

        // Get the state of the window and the width/height from the registry
        ReadRegistryValues();

    /// <summary>
    /// Gets the Width of the Window
    /// </summary>
    public double WindowWidth
    {
        get { return windowWidth_; }
        set { windowWidth_ = value; NotifyPropertyChanged("WindowWidth"); }
    }

    /// <summary>
    /// Gets the Height of the Window
    /// </summary>
    public double WindowHeight
    {
        get { return windowHeight_; }
        set { windowHeight_ = value; NotifyPropertyChanged("windowHeight"); }
    }

    ...
}

此窗口是从App::OnStartup()创建的。

当我运行代码时，调试器会在输出窗口中抛出以下错误。

找不到引用'RelativeSource FindAncestor，AncestorType ='System.Windows.Window'，AncestorLevel ='1'的绑定源。 BindingExpression：路径= WINDOWHEIGHT;的DataItem = NULL; target元素是'MainView'（Name =''）; target属性是'Height'（类型'Double'）

和WindowWidth的类似内容。

我以为我理解了绑定模式，但我想我错了：（

我在想使用FindAncestor查找一个Window会导致它查找可视树，直到找到包含我的属性的MainView窗口。

任何帮助都会非常感激。

Answer 1

试

Width="{Binding Path=WindowWidth, RelativeSource={RelativeSource Self}}"

Codebehind与您的窗口相同。所以使用自我绑定。

绑定到MainView窗口的Width属性时出现绑定错误

1 个答案: