WPF 错误：“找不到管理 FrameworkElement 或 Framework...”
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WPF Error: "Cannot find governing FrameworkElement or Framework..."
提问by Gustavo Calderon
Im getting the following error:
我收到以下错误：
System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=ImagePath; DataItem=null; target element is 'VisualBrush' (HashCode=52892165); target property is 'Visual' (type 'Visual')
System.Windows.Data 错误：2：找不到目标元素的管理 FrameworkElement 或 FrameworkContentElement。BindingExpression:Path=ImagePath; 数据项=空；目标元素是“VisualBrush”（HashCode=52892165）；目标属性是“Visual”（类型“Visual”）
I'm trying to set a Canvastype from MainWindowto my WPF Control(Named SearchTextBox) property ImagePath, so the control show it. This Canvaswraps the path of an icon. When i try and run it i cant see the icon and i get the:
我正在尝试将Canvas类型设置MainWindow为我的WPF Control(Named SearchTextBox) 属性ImagePath，以便控件显示它。这Canvas包装了一个图标的路径。当我尝试运行它时，我看不到图标，我得到：
System.Windows.Data Error: 2.
System.Windows.Data 错误：2。
This is my code:
这是我的代码：
My WPF Control:
我的 WPF 控件：
SearchTextBox.cs:
搜索文本框.cs：
public static readonly DependencyProperty ImagePathProperty =
DependencyProperty.Register(
"ImagePath",
typeof(Canvas),
typeof(SearchTextBox));
public Canvas ImagePath
{
get { return (Canvas)GetValue(ImagePathProperty); }
set { SetValue(ImagePathProperty, value); }
}
Generic.xaml
通用文件
<Border x:Name="PART_SearchIconBorder"
Grid.Column="2"
VerticalAlignment="Stretch"
HorizontalAlignment="Stretch"
BorderBrush="{StaticResource SearchTextBox_SearchIconBorder}">
<Rectangle
Width="15"
Height="15">
<Rectangle.Fill>
<VisualBrush Stretch="Fill"
Visual="{Binding ImagePath}" />
</Rectangle.Fill>
</Rectangle>
My View:
我的看法：
<Controls:MetroWindow x:Class="TestUI.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:l="clr-namespace:UIControls;assembly=SearchTextBox"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
Title="Window1" Height="423" Width="487">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Resources/Icons.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colours.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<Grid> //----appbar_add is the canvas
<l:SearchTextBox ImagePath="{StaticResource appbar_add}" Height="39" Margin="118,52,116,0" VerticalAlignment="Top" Name="m_txtTest" />
<TextBox Margin="118,0,116,68" Name="m_txtSearchContent" Height="65" VerticalAlignment="Bottom" />
<TextBlock HorizontalAlignment="Left" Margin="118,0,0,139" Width="107" Text="Search content" FontSize="14" Height="20" VerticalAlignment="Bottom" />
</Grid>
Any ideas? Thanks in advance.
有任何想法吗？提前致谢。
回答by Flangus
I'm assuming the content in Generic.xaml is part of the ControlTemplatefor the SearchTextBoxclass. Since it's a control template, you need to use TemplateBindingto bind to the properties of the control that the template is applied to. So, change:
我假设在Generic.xaml内容的部分ControlTemplate为SearchTextBox类。既然是控件模板，就需要使用TemplateBinding来绑定到应用模板的控件的属性上。所以，改变：
Visual="{Binding ImagePath}"
to
到
Visual="{TemplateBinding ImagePath}"
