如何从另一个线程在Treeview中添加对象 [英] How to add object in treeview from another thread

问题描述

我有一个多线程应用程序，我需要将另一个线程中的对象添加到树视图中.但我不断遇到异常

I have a multithreading app, and I need to add object from another thread to the treeview. But I keep getting an exception

正在从错误的线程调用对此控件执行的操作.使用Control.Invoke或Control.BeginInvoke将其编组到正确的线程以执行此操作.

Action being performed on this control is being called from the wrong thread. Marshal to the correct thread using Control.Invoke or Control.BeginInvoke to perform this action.

这是我的代码

ThreadPool.QueueUserWorkItem(new WaitCallback(GetFiles), entryPoint);

private void GetFiles(object entryPoint) 
{ 
      var localData = entryPoint as EntryPoint; 
      this.GetFiles(localData.DirectoryInfo, localData.TreeNode); 
      localData.ManualEvent.Set(); 
}

private void GetFiles(DirectoryInfo directory, TreeNode tree) 
{ 
    for (int i = 0; i < allFiles.GetLength(0); i++) 
    { 
        tree.Nodes.Add(allFiles[i].Name);
    }
}

推荐答案

由于错误状态，您需要在UI线程上执行与UI相关的操作.为此，您可以在控件本身中使用BeginInvoke.

As the error states, you need to perform UI related actions on the UI thread. In order to do this, you can use BeginInvoke from the control itself.

private void GetFiles(DirectoryInfo directory, TreeNode tree) 
{ 
    if (TreeViewControl.InvokeRequired)
    {
        TreeViewControl.BeginInvoke((MethodInvoker)delegate
        {
            for (int i = 0; i < allFiles.GetLength(0); i++) 
            { 
                tree.Nodes.Add(allFiles[i].Name);
            }
        });
    }
}

您可以在此处.

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