Question

我有以下g++ -o pathfinder main.o OpenCL.o -L/opt/AMDAPP/lib/x86_64/ -lOpenCL -lrt：

listview

它有一些文本项和一个组合框。在我更改组合框值后，我想对所选项目执行某些操作，该项目应该是其组合框刚刚与之交互的项目。但是，当我与项目上的组合框进行交互而没有与项目进行任何其他操作时，它不会被选中。当我与该项目的组合框进行交互时，如何设置所选项目？

Answer 1

尝试这样的事情：

(sender as ComboBox).TryFindParent<ListView>().SelectedItem = (sender as ComboBox).TryFindParent<ListViewItem>();

你的dropDownClosed事件

上的

TryFindParent<T>()是一个帮助函数，可在此处找到：http://www.hardcodet.net/2008/02/find-wpf-parent

/// <summary>
/// Finds a parent of a given item on the visual tree.
/// </summary>
/// <typeparam name="T">The type of the queried item.</typeparam>
/// <param name="child">A direct or indirect child of the
/// queried item.</param>
/// <returns>The first parent item that matches the submitted
/// type parameter. If not matching item can be found, a null
/// reference is being returned.</returns>
public static T TryFindParent<T>(this DependencyObject child)
    where T : DependencyObject
{
  //get parent item
  DependencyObject parentObject = GetParentObject(child);

  //we've reached the end of the tree
  if (parentObject == null) return null;

  //check if the parent matches the type we're looking for
  T parent = parentObject as T;
  if (parent != null)
  {
    return parent;
  }
  else
  {
    //use recursion to proceed with next level
    return TryFindParent<T>(parentObject);
  }
}

/// <summary>
/// This method is an alternative to WPF's
/// <see cref="VisualTreeHelper.GetParent"/> method, which also
/// supports content elements. Keep in mind that for content element,
/// this method falls back to the logical tree of the element!
/// </summary>
/// <param name="child">The item to be processed.</param>
/// <returns>The submitted item's parent, if available. Otherwise
/// null.</returns>
public static DependencyObject GetParentObject(this DependencyObject child)
{
  if (child == null) return null;

  //handle content elements separately
  ContentElement contentElement = child as ContentElement;
  if (contentElement != null)
  {
    DependencyObject parent = ContentOperations.GetParent(contentElement);
    if (parent != null) return parent;

    FrameworkContentElement fce = contentElement as FrameworkContentElement;
    return fce != null ? fce.Parent : null;
  }

  //also try searching for parent in framework elements (such as DockPanel, etc)
  FrameworkElement frameworkElement = child as FrameworkElement;
  if (frameworkElement != null)
  {
    DependencyObject parent = frameworkElement.Parent;
    if (parent != null) return parent;
  }

  //if it's not a ContentElement/FrameworkElement, rely on VisualTreeHelper
  return VisualTreeHelper.GetParent(child);
}

Answer 2

Filippo的解决方案很接近，但在我的情况下不起作用。我最终使用了他提到的TryFindParent<T>()函数，但我的代码看起来像这样：

private void ComboBox_DropDownClosed(object sender, System.EventArgs e)
{
    listView.SelectedItem = null;
    var newSelectedItem = (sender as ComboBox).TryFindParent<ListViewItem>();         
    newSelectedItem.IsSelected = true;
}

其中listView是我的ListView的名称。

选择组合框时，WPF在列表视图中设置所选项目

2 个答案: