问题描述
嘿,我对WPF和Binding还是很陌生,在输出中出现了一个错误,错误提示:
System.Windows.Data错误:40:BindingExpression路径错误:在``object''``''ImpModel''(HashCode = 38389450)''上找不到``DataContext''属性. BindingExpression:Path = DataContext; DataItem ="ImpModel''(HashCode = 38389450);目标元素是``TreeView''(Name =''_ View''); target属性是"NoTarget"(类型"Object")
这是我的Xaml:
Hey I am pretty new to WPF and Binding I am having an issue in the Output where the error says:
System.Windows.Data Error: 40 : BindingExpression path error: ''DataContext'' property not found on ''object'' ''''ImpModel'' (HashCode=38389450)''. BindingExpression:Path=DataContext; DataItem=''ImpModel'' (HashCode=38389450); target element is ''TreeView'' (Name=''_View''); target property is ''NoTarget'' (type ''Object'')
Here is my Xaml:
<TreeView x:Name="_View" ItemsSource="{Binding List}" Margin="2"
SelectedValuePath="DataContext" ItemTemplate="{StaticResource TreeViewItemTemplate}" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectedItemChanged">
<i:InvokeCommandAction Command="{Binding SelectedTemplateCommand}"
CommandParameter="{Binding SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType=TreeView}}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TreeView>
推荐答案
<Window x:Class="WpfApplication.AllControls.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" x:Name="root">
<TreeView x:Name="_View" ItemsSource="{Binding List}" Margin="2"
SelectedValuePath="{Binding Path=DataContext, ElementName=root}" ItemTemplate="{StaticResource TreeViewItemTemplate}" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectedItemChanged">
<i:InvokeCommandAction Command="{Binding SelectedTemplateCommand}"
CommandParameter="{Binding SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType=TreeView}}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TreeView>
这应该可行.
This should work.
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