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我試圖從單獨的窗口使用RadDiagram命令。我的綁定不起作用,因爲「無法找到與參考綁定的源'ElementName = Diagram'」。我(簡體)XAML看起來是這樣的:棘手的命令源問題
<UserControl x:Class="Client.Wpf.EditableLayoutControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:s="clr-namespace:Client.Wpf" xmlns:Converters="clr-namespace:Client.Wpf.Converters"
mc:Ignorable="d" DataContext="{Binding RelativeSource={RelativeSource Self}}"
d:DesignHeight="300" d:DesignWidth="800" Background="Transparent" Name="Root">
<UserControl.Resources>
<Converters:MultiBoolToVisibilityConverter x:Key="multiBoolToVis"/>
<Converters:ObjectToBooleanConverter x:Key="objToBool"/>
<telerik:InvertedBooleanConverter x:Key="invBool"/>
</UserControl.Resources>
<telerik:RadDocking HasDocumentHost="False" BorderThickness="0" Name="DockingStation">
<telerik:RadSplitContainer>
<telerik:RadPaneGroup>
<telerik:RadPane CanDockInDocumentHost="False" Title="Controls" >
<telerik:RadPane.TitleTemplate>
<DataTemplate>
<Grid Margin="0 5">
<ContentPresenter Content="{Binding}" VerticalAlignment="Center"/>
<telerik:RadButton Command="telerik:DiagramCommands.Undo" CommandTarget="{Binding Path=Diagram, Source={RelativeSource FindAncestor, AncestorType={x:Type s:EditableLayoutControl}}}" />
</Grid>
</DataTemplate>
</telerik:RadPane.TitleTemplate>
<telerik:RadTabControl ...></telerik:RadTabControl>
</telerik:RadPane>
</telerik:RadPaneGroup>
</telerik:RadSplitContainer>
<telerik:RadSplitContainer>
<telerik:RadPaneGroup>
<telerik:RadPane PaneHeaderVisibility="Collapsed" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
<Grid>
<telerik:RadDiagram Name="Diagram">...
</telerik:RadDiagram>
</Grid>
</telerik:RadPane>
</telerik:RadPaneGroup>
</telerik:RadSplitContainer>
</telerik:RadDocking>
</UserControl>
有問題的代碼行是這樣的BEAUT從裏面的DataTemplate:
CommandTarget="{Binding Path=Diagram, Source={RelativeSource FindAncestor, AncestorType={x:Type s:EditableLayoutControl}}}"
這行代碼不起作用,因爲圖是不是屬性,並且綁定需要屬性。使用ElementName而不是Path也不起作用,因爲ElementName和Source是獨佔的。我也試過這個:
CommandTarget="{Binding ElementName=Diagram}"
那行代碼不起作用。它給出了這樣的錯誤:
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Diagram'. BindingExpression:(no path); DataItem=null; target element is 'RadButton' (Name=''); target property is 'CommandTarget' (type 'IInputElement')
我也試過CommandTarget="{x:Reference Diagram}"
,但該功能是顯然尚未實現在.NET 4.0中。它是如何完成的?