一些数据网格细胞禁用上下文菜单WPF

Question

我已经定义这样的：结果

一个数据网格

 <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>

这是每一个细胞由此可见contextMenu当右键点击完成。结果的我要为所有除报头中的细胞禁用上下文菜单，并也对某些条件标题。 （我不想使用，因为我不想在这里解释了一些其他问题DataGridHeaderStyle。）的搜索结果

我已经在DataGrid中定义的处理程序的PreviewMouseRightButtonDown并在处理程序，我试图做一些这样的：

    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)
        {
            //some condition here which says whether contextmenu is required on this header

            (depObj as DataGridColumnHeader).ContextMenu = null;
            //the above line is not working!!!!
        }
        else
        {
             (depObj as DataGridCell).ContextMenu = null;
              //the above line not working!!!!
         }
    }

我想知道我要去哪里错了！请帮我对此。还指导我以更好的方式做，如果我达到我的要求，以错误的方式：）

Answer 1

嘿我解决它::我修改代码如下:::结果

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
     }
}

Answer 2

我觉得这个版本是这样更快，你不必设置上下文菜单的可见性。只是取消点击事件，如果点击的是列标题。

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;
    }
}

Answer 3

我在DataGridCell RichTextBox中不是的VisualTree元件。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

的LogRecord是DataGridColumn.Item的类型

Answer 4

的Generac odiceta制备>抱歉。第一次尝试就没有那么好。