C# 从子xaml检索treeviewitem的datacontext
我有一个数据绑定的treeview,从中创建/显示treeview项,并具有上下文菜单。这工作正常。然后,我尝试使用一个自定义的menuitem类,这样就可以通过从contextmenu触发的命令检索treevieItem的datacontext。抱歉,这让人困惑。我可能做得不对 这是我的xamlC# 从子xaml检索treeviewitem的datacontext,c#,wpf,xaml,treeview,datacontext,C#,Wpf,Xaml,Treeview,Datacontext,我有一个数据绑定的treeview,从中创建/显示treeview项,并具有上下文菜单。这工作正常。然后,我尝试使用一个自定义的menuitem类,这样就可以通过从contextmenu触发的命令检索treevieItem的datacontext。抱歉,这让人困惑。我可能做得不对 这是我的xaml <UserControl x:Class="Pipeline_General.Custom_Controls.ProjectTree" xmlns="http://schema
<UserControl x:Class="Pipeline_General.Custom_Controls.ProjectTree"
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:pm="clr-namespace:Pipeline_General"
mc:Ignorable="d"
DataContext = "{Binding RelativeSource={RelativeSource Self}}"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<TreeView Name="StructureTree" Background="{x:Static pm:myBrushes.defaultBG}" ItemsSource="{Binding ProjectList}">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
<Setter Property="Margin" Value="5,5,5,5" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu Background="{x:Static pm:myBrushes.defaultBG}" Foreground="{x:Static pm:myBrushes.gray}">
<pm:ProjectTreeMenuItem Header="Add Episode.."
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.AddEpCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Add Sequence.."
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.AddSeqCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Add Scene.."
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.AddScCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
</ContextMenu>
</Setter.Value>
</Setter>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type pm:ProjectRoot}" ItemsSource="{Binding Episodes}">
<TextBlock Text="{Binding Path=Title}" Foreground="{x:Static pm:myBrushes.pink}"
FontFamily="Calibri" FontSize="18"/>
<HierarchicalDataTemplate.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
<Setter Property="Margin" Value="5,5,5,5" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu Background="{x:Static pm:myBrushes.defaultBG}" Foreground="{x:Static pm:myBrushes.gray}">
<pm:ProjectTreeMenuItem Header="Add Sequence.."
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.AddSeqCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Add Scene.."
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.AddScCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<Separator Height="15" Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Cut"
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.CutCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Un-Cut"
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.UnCutCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
</ContextMenu>
</Setter.Value>
</Setter>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<HierarchicalDataTemplate.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type pm:Episode}" ItemsSource="{Binding Sequences}">
<TextBlock Text="{Binding Path=Key}" Foreground="{x:Static pm:myBrushes.yellow}"
FontFamily="Calibri" FontSize="14"/>
<HierarchicalDataTemplate.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
<Setter Property="Margin" Value="5,5,5,5" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu Background="{x:Static pm:myBrushes.defaultBG}" Foreground="{x:Static pm:myBrushes.gray}">
<pm:ProjectTreeMenuItem Header="Add Scene.."
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.AddScCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<Separator Height="15" Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Cut"
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.CutCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Un-Cut"
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.UnCutCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
</ContextMenu>
</Setter.Value>
</Setter>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<HierarchicalDataTemplate.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type pm:Sequence}" ItemsSource="{Binding Scenes}">
<TextBlock Text="{Binding Path=Key}" Foreground="{x:Static pm:myBrushes.yellow}"
FontFamily="Calibri" FontSize="14"/>
<HierarchicalDataTemplate.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu Background="{x:Static pm:myBrushes.defaultBG}" Foreground="{x:Static pm:myBrushes.gray}">
<pm:ProjectTreeMenuItem Header="Cut"
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.CutCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
<pm:ProjectTreeMenuItem Header="Un-Cut"
Element="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"
Command="{x:Static pm:MyCommands.UnCutCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
Margin="20,0"/>
</ContextMenu>
</Setter.Value>
</Setter>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
</HierarchicalDataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
以及我的自定义菜单项类和命令
public static class MyCommands
{
static MyCommands()
{
AddEpCommand = new SimpleDelegateCommand(p =>
{
var menuItem = p as ProjectTreeMenuItem;
var Element = menuItem.Element as ProjectElement;
Console.WriteLine(Element.Key);
Console.WriteLine("EP");
});
AddSeqCommand = new SimpleDelegateCommand(p =>
{
var menuItem = p as ProjectTreeMenuItem;
var Element = menuItem.Element as ProjectElement;
Console.WriteLine(Element.Key);
Console.WriteLine("SEQ");
});
AddScCommand = new SimpleDelegateCommand(p =>
{
var menuItem = p as ProjectTreeMenuItem;
var Element = menuItem.Element as ProjectElement;
Console.WriteLine(Element.Key);
Console.WriteLine("SC");
});
CutCommand = new SimpleDelegateCommand(p =>
{
var menuItem = p as ProjectTreeMenuItem;
var Element = menuItem.Element as ProjectElement;
Console.WriteLine(Element.Key);
Console.WriteLine("SC");
});
UnCutCommand = new SimpleDelegateCommand(p =>
{
var menuItem = p as ProjectTreeMenuItem;
var Element = menuItem.Element as ProjectElement;
Console.WriteLine(Element.Key);
Console.WriteLine("SC");
});
}
public static ICommand AddEpCommand { get; set; }
public static ICommand AddSeqCommand { get; set; }
public static ICommand AddScCommand { get; set; }
public static ICommand CutCommand { get; set; }
public static ICommand UnCutCommand { get; set; }
}
public class SimpleDelegateCommand : ICommand
{
public SimpleDelegateCommand(Action<object> executeAction)
{
_executeAction = executeAction;
}
private Action<object> _executeAction;
public bool CanExecute(object parameter)
{
return true;
}
public event EventHandler CanExecuteChanged;
public void Execute(object parameter)
{
_executeAction(parameter);
}
}
public class ProjectTreeMenuItem : MenuItem
{
#region Element (DependencyProperty)
public ProjectElement Element
{
get { return (ProjectElement)GetValue(ElementProperty); }
set { SetValue(ElementProperty, value); }
}
public static readonly DependencyProperty ElementProperty =
DependencyProperty.Register("Element", typeof(ProjectElement), typeof(ProjectTreeMenuItem),
new PropertyMetadata { PropertyChangedCallback = ElementChanged });
private static void ElementChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ProjectTreeMenuItem so = d as ProjectTreeMenuItem;
if (so != null && e.NewValue != null)
{
so.Element = (ProjectElement)e.NewValue;
Console.WriteLine("HERE " + so.Element.Title);
}
}
#endregion
public ProjectTreeMenuItem()
:base()
{
}
}
公共静态类MyCommands
{
静态MyCommands()
{
AddEpCommand=新的SimpleDelegateCommand(p=>
{
var menuItem=p作为项目树menuItem;
var Element=menuItem.Element作为ProjectElement;
Console.WriteLine(Element.Key);
控制台写入线(“EP”);
});
AddSeqCommand=新的SimpleDelegateCommand(p=>
{
var menuItem=p作为项目树menuItem;
var Element=menuItem.Element作为ProjectElement;
Console.WriteLine(Element.Key);
控制台写入线(“SEQ”);
});
AddScCommand=新的SimpleDelegateCommand(p=>
{
var menuItem=p作为项目树menuItem;
var Element=menuItem.Element作为ProjectElement;
Console.WriteLine(Element.Key);
控制台写入线(“SC”);
});
CUTCOMAND=新的SimpleDelegateCommand(p=>
{
var menuItem=p作为项目树menuItem;
var Element=menuItem.Element作为ProjectElement;
Console.WriteLine(Element.Key);
控制台写入线(“SC”);
});
UNUCTCOMAND=新的SimpleDelegateCommand(p=>
{
var menuItem=p作为项目树menuItem;
var Element=menuItem.Element作为ProjectElement;
Console.WriteLine(Element.Key);
控制台写入线(“SC”);
});
}
公共静态ICommand AddEpCommand{get;set;}
公共静态ICommand addSeq命令{get;set;}
公共静态ICommand AddScCommand{get;set;}
公共静态ICommand命令{get;set;}
公共静态ICOMAND UNCUTCOMAND{get;set;}
}
公共类SimpleDelegateCommand:ICommand
{
公共SimpleDelegateCommand(操作执行)
{
_executeAction=executeAction;
}
私人行动——执行;
公共布尔CanExecute(对象参数)
{
返回true;
}
公共事件处理程序CanExecuteChanged;
public void Execute(对象参数)
{
_执行(参数);
}
}
公共类ProjectTreeMenuItem:MenuItem
{
#区域元素(从属属性)
公共项目元素
{
获取{return(ProjectElement)GetValue(ElementProperty);}
set{SetValue(ElementProperty,value);}
}
公共静态只读DependencyProperty ElementProperty=
DependencyProperty.Register(“元素”)、typeof(项目元素)、typeof(项目树元素),
新属性元数据{PropertyChangedCallback=ElementChanged});
私有静态void元素已更改(DependencyObject d、DependencyPropertyChangedEventArgs e)
{
ProjectTreeMenuItem so=d作为ProjectTreeMenuItem;
if(so!=null&&e.NewValue!=null)
{
元素=(ProjectElement)e.NewValue;
Console.WriteLine(“此处”+so.Element.Title);
}
}
#端区
公共项目树元素()
:base()
{
}
}
projectElement类(我在项目的数百个其他地方使用)有一个String键,String Title属性,在其他地方可以正常工作。我很确定我的问题在于通过xaml通过datac设置元素属性
<ContextMenu Background="{x:Static pm:myBrushes.defaultBG}" Foreground="{x:Static pm:myBrushes.gray}"
DataContext="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}">
<MenuItem Header="Add Episode.."
Command="{x:Static pm:MyCommands.AddEpCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ContextMenu}}, Path=PlacementTarget.DataContext}"
Margin="20,0"/>
<MenuItem Header="Add Sequence.."
Command="{x:Static pm:MyCommands.AddSeqCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ContextMenu}}, Path=PlacementTarget.DataContext}"
Margin="20,0"/>
<MenuItem Header="Add Scene.."
Command="{x:Static pm:MyCommands.AddScCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ContextMenu}}, Path=PlacementTarget.DataContext}"
Margin="20,0"/>
</ContextMenu>