C# 未在关联菜单中调用DelegateCommand

我似乎无法让这个右击弹出菜单工作

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

//委托的命令
公共DelegateCommand命令PopupClick{get；set；}
//分配委托命令。
CommandPopupClick=新的DelegateCommand（PopupClick，CanMyCommand）；
//单击右键单击选项的事件
公共void弹出式单击（对象参数）
{
var something=Parameters；//这里是Break，查看事件是否触发
}

我可以看到带有“删除”和“属性”的弹出菜单。但是，当我单击其中一个按钮时，它不会触发事件

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

注意：委托命令系统适用于所有其他方面，我认为这不是问题所在

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

我真的不想使用

Name.Click+=newroutedEvent（）

，如果我能帮上忙的话

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

谢谢

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

按要求调试时出错

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
'Enterprise.exe' (CLR v4.0.30319: Enterprise.exe): Loaded 'Microsoft.GeneratedCode'. 
'Enterprise.exe' (CLR v4.0.30319: Enterprise.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemCore\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemCore.dll'. Cannot find or open the PDB file.
A first chance exception of type 'System.IO.IOException' occurred in PresentationFramework.dll
A first chance exception of type 'System.IO.IOException' occurred in PresentationCore.dll
'Enterprise.exe' (CLR v4.0.30319: Enterprise.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll'. Cannot find or open the PDB file.
The thread 0x1954 has exited with code 259 (0x103).

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

决议：

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

---

感谢所有帮助您的人。

您不能使用

相对资源绑定

从

上下文菜单

访问

树视图。数据上下文

，因为它不在主UI可视树中。这是一个有很好文档记录的问题，解决方案是使用

ContextMeny.PlacementTarget

属性和应用了

ContextMenu

的对象上的

Tag

属性将

DataContext

对象传递到

ContextMenu

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

---

关于这一点，我已经写了很多次了，现在，我更愿意请您阅读我对Stack Overflow的回答和这里的问题，以获得完整的解释和代码示例。如果您需要进一步的帮助，只需在internet上搜索“WPF ContextMenu DataContext”或类似内容，就可以找到几十本关于此主题的教程。

ContextMenu

不是可视树的一部分，因此

FindanceStorey

数据绑定将无法工作

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

您可以在

ContextMenu

上显式设置

DataContext

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

e、 g.您可以直接在XAML中创建ViewModel/DataContext的实例（如果可以的话）

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

<Style TargetType="{x:Type TreeViewItem}">
  <Setter Property="ContextMenu">
    <Setter.Value>
      <ContextMenu>
        <ContextMenu.DataContext>
          <local:MyViewModel/>
        </ContextMenu.DataContext>

        <MenuItem Command="{Binding Path=CommandPopupClick}"
                  CommandParameter="{Binding Path=SelectedItem}"
                  Header="Delete" />
        <Separator />
        <MenuItem Command="{Binding Path=CommandPopupClick}"
                  CommandParameter="{Binding Path=SelectedItem}"
                  Header="Properties" />
      </ContextMenu>
    </Setter.Value>
  </Setter>
</Style>

---

自从越来越多地了解C#和WPF以来，如果其他人正在寻找关于这一点的答案。 答案很简单

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

你走错了路。 如果您需要一次又一次地使用“行为”，并且您需要使用MVVM样式的代码（或者您认为您需要，因为它可能还不完全存在） 您需要使用他们所谓的附加属性

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

简单地说

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

创建附加的属性类。你应该开始了

创建菜单项的模板示例如下

创建标准菜单项

处理附加属性PropertyMetadata事件处理程序中的所有内容

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

 <Style TargetType="MenuItem">
      <Setter Property="Properties:ControlMenuItem.InvokeClick" Value="{Binding  RelativeSource={RelativeSource Self}}"/>
 </Style>

---

绑定中是否存在数据错误？调试时检查输出窗格。根据请求添加了错误代码。很遗憾，没有一个是数据绑定错误，查看打开关联菜单或单击该菜单时是否出现任何数据错误。是否可以尝试在

菜单项

上设置

数据关联

，而不是父项

关联菜单

？右键单击该项并打开关联菜单时没有错误。当我单击菜单项时，输出窗口中没有输出。是，这可以工作。但是你说这两个都创建了我的viewmodel的新实例？谢谢，这给了我解决问题所需的详细信息