Question

我有这种方法来更新我的TreeView。如果我不使用BackgroundWorker一切正常。但是如果这样做，那么我的TreeViewItem不会更新，但它的DataContex会发生变化。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);}

有什么想法吗？

Answer 1

使用调用方法http://msdn.microsoft.com/en-us/library/zyzhdc6b.aspx（How to update the GUI from another thread in C#?），以下是http://www.codeproject.com/KB/tree/ThreadingTreeView.aspx的示例。

Answer 2

我不确定问题是否更具体 WPF ;但如果是，那么这是我的建议：

如果您使用过DataBinding，这可能是一个DataContext解决问题，您的DataContext将被其他一些值覆盖/替换。请参考这两个关于DataContext如何工作的链接：

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

TreeViewItem无法在BackgroundWorker中更新

2 个答案: