禁用某些DatGrid单元格WPF上的上下文菜单

我已经定义了这样的数据网格：：

 <cc:PEDataGrid AutoGenerateColumns="False"
               ItemsSource="{Binding Rows}"
               Width="Auto"                
               PreviewMouseRightButtonDown="PEGrid_PreviewMouseRightButtonDown"
               Loaded="CommonPEGrid_Loaded">             
      <wpfkit:DataGrid.ContextMenu>
        <ContextMenu>
            <MenuItem Header="Cut" />
            <MenuItem Header="Copy"/>
            <MenuItem Header="Paste"/>              
        </ContextMenu>
    </wpfkit:DataGrid.ContextMenu>
</cc:PEDataGrid>

---

我想知道我哪里做错了！！请帮我解决这个问题。如果我以错误的方式实现了我的需求，请指导我以更好的方式完成：）

嘿，我解决了它：：我修改的代码如下：：

private void PEGrid_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
    DependencyObject depObj = (DependencyObject)e.OriginalSource;

    while ((depObj != null) && !(depObj is DataGridColumnHeader))
    {
        depObj = VisualTreeHelper.GetParent(depObj);
    }

    if (depObj == null)
    {
        return;
    }

    if (depObj is DataGridColumnHeader)
    {
          dg.ContextMenu.Visibility = Visibility.Visible;  //works
    }
    else
    {
          dg.ContextMenu.Visibility = Visibility.Collapsed; //works
     }
}

---

我认为这个版本要快得多，而且您不必设置上下文菜单的可见性。如果单击是在列标题上，则只需取消单击事件

private void PEGrid_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
    var depObj = (DependencyObject)e.OriginalSource;
    while ((depObj != null) && !(depObj is DataGridColumnHeader))
    {
        depObj = VisualTreeHelper.GetParent(depObj);
    }
    if (depObj is DataGridColumnHeader)
    {
        e.Handled = true;
    }
}

---

DataGridCell中的RichTextBox不是VisualTree元素。我的代码：

private void dgLog_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        FrameworkContentElement fce = e.OriginalSource as FrameworkContentElement;
        DependencyObject depObj = e.OriginalSource as DependencyObject;
        DataGridCell dgc = null;
        DataGridRow dgr = null;
        try
        {
            while (fce != null && !(fce is DataGridCell))
            {
                depObj = fce.Parent;
                fce = depObj as FrameworkContentElement;
            }
            while (depObj != null && !(depObj is DataGridRow))
            {
                if (depObj is DataGridCell)
                    dgc = depObj as DataGridCell;
                depObj = VisualTreeHelper.GetParent(depObj);
            }
            if (depObj == null)
                return;
            dgr = depObj as DataGridRow;
            if (((LogRecord)dgr.Item).SourceType == "FileMessage" && dgc.Column.DisplayIndex == 1)
                dgLog.ContextMenu = cm_dgLog;
            else
                dgLog.ContextMenu = null;
        }
        catch (Exception ex)
        {
            MessageBox.Show(...);
            TraceHelper.TraceError(ex, GetType());
        }
    }//private void dgLog_PreviewMouseRightButtonDown

LogRecord是DataGridColumn.Item的类型

    private void dgLog_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        FrameworkContentElement fce = e.OriginalSource as FrameworkContentElement;
        DependencyObject depObj = e.OriginalSource as DependencyObject;
        DataGridCell dgc = null;
        DataGridRow dgr = null;
        try
        {
            while (fce != null && !(fce is DataGridCell))
            {
                depObj = fce.Parent;
                fce = depObj as FrameworkContentElement;
            }
            while (depObj != null && !(depObj is DataGridRow))
            {
                if (depObj is DataGridCell)
                    dgc = depObj as DataGridCell;
                depObj = VisualTreeHelper.GetParent(depObj);
            }
            if (depObj == null)
                return;
            dgr = depObj as DataGridRow;
            if (((LogRecord)dgr.Item).SourceType == "FileMessage" && dgc.Column.DisplayIndex == 1)
                dgLog.ContextMenu = cm_dgLog;
            else
                dgLog.ContextMenu = null;
        }
        catch (Exception ex)
        {
            MessageBox.Show(...);
            TraceHelper.TraceError(ex, GetType());
        }
    }//private void dgLog_PreviewMouseRightButtonDown

---

对不起。第一次尝试不太好。

我使用此响应作为停止在标题上显示上下文菜单的基础。感谢您发布最终功能解决方案。如果我在OnMouseRIghtButtonUp事件中使用此代码，那么这里唯一适合我的版本。

    private void dgLog_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        FrameworkContentElement fce = e.OriginalSource as FrameworkContentElement;
        DependencyObject depObj = e.OriginalSource as DependencyObject;
        DataGridCell dgc = null;
        DataGridRow dgr = null;
        try
        {
            while (fce != null && !(fce is DataGridCell))
            {
                depObj = fce.Parent;
                fce = depObj as FrameworkContentElement;
            }
            while (depObj != null && !(depObj is DataGridRow))
            {
                if (depObj is DataGridCell)
                    dgc = depObj as DataGridCell;
                depObj = VisualTreeHelper.GetParent(depObj);
            }
            if (depObj == null)
                return;
            dgr = depObj as DataGridRow;
            if (((LogRecord)dgr.Item).SourceType == "FileMessage" && dgc.Column.DisplayIndex == 1)
                dgLog.ContextMenu = cm_dgLog;
            else
                dgLog.ContextMenu = null;
        }
        catch (Exception ex)
        {
            MessageBox.Show(...);
            TraceHelper.TraceError(ex, GetType());
        }
    }//private void dgLog_PreviewMouseRightButtonDown