TreeViewItem不能在BackgroundWorker中更新

本文关键字：更新 BackgroundWorker 不能 TreeViewItem | 更新日期: 2023-09-27 18:12:39

我有这个方法来更新我的TreeView。如果我不使用BackgroundWorker，一切都很好。但如果这样做，那么我的TreeViewItem不更新，但它的DataContex的变化。这也很好:item.IsEnabled = false; 

private void twSports_Expanded(object sender, RoutedEventArgs e)    
{       
TreeViewItem item = e.OriginalSource as TreeViewItem;
TreeLeaf leaf = item.DataContext as TreeLeaf;  var bgWorker = new BackgroundWorkerOnGrid(gridPartitions);
bgWorker.DoWork += delegate(object s, DoWorkEventArgs args)
{              
    if (leaf.Item != null)
    {
        if (leaf.Item.GetType() == typeof(SportType))
        {
            SportType sport = leaf.Item as SportType;
            args.Result = LoadSportPartitions(sport);
        }
        if (leaf.Item.GetType() == typeof(SportPartition))
        {
            SportPartition partition = leaf.Item as SportPartition;
            args.Result = LoadSportPartitions(partition);
        }
    }
};
bgWorker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
{
    List<SportPartition> partitions = args.Result as List<SportPartition>;
    if (partitions != null)
    {
        leaf.LoadChilds(partitions.ToArray());    //it doesn't work
        item.IsEnabled = false; //it works
    }
    (s as BackgroundWorkerOnGrid).Dispose();
};
bgWorker.RunWorkerAsync(leaf.Item);}

任何想法?

TreeViewItem不能在BackgroundWorker中更新

使用Invoke方法http://msdn.microsoft.com/en-us/library/zyzhdc6b.aspx(如何从c#中的另一个线程更新GUI ?)，这里有一个例子如何http://www.codeproject.com/KB/tree/ThreadingTreeView.aspx.

我不确定问题是否更WPF具体;如果是这样，我的建议是:

如果你已经使用了数据绑定，这可能是一个DataContext解决问题，你的DataContext被一些其他值覆盖/替换。关于DataContext如何工作，请参考以下两个链接:

http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.datacontext.aspx

http://msdn.microsoft.com/en-us/library/ms752347.aspx

http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.datacontextchanged.aspx

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