也许有点过量，但这是我通常解决问题的方式：

由于同步，此处不需要调用。BasicClassThreadExample对我来说只是一种布局，因此请根据您的实际需要进行更改。

这很简单，因为您不需要处理UI线程中的内容！

public partial class Form1 : Form
{
    BasicClassThreadExample _example;

    public Form1()
    {
        InitializeComponent();
        _example = new BasicClassThreadExample();
        _example.MessageReceivedEvent += _example_MessageReceivedEvent;
    }

    void _example_MessageReceivedEvent(string command)
    {
        listBox1.Items.Add(command);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        listBox1.Items.Clear();
        _example.Start();
    }
}

public class BasicClassThreadExample : IDisposable
{
    public delegate void MessageReceivedHandler(string msg);

    public event MessageReceivedHandler MessageReceivedEvent;

    protected virtual void OnMessageReceivedEvent(string msg)
    {
        MessageReceivedHandler handler = MessageReceivedEvent;
        if (handler != null)
        {
            handler(msg);
        }
    }

    private System.Threading.SynchronizationContext _SynchronizationContext;
    private System.Threading.Thread _doWorkThread;
    private bool disposed = false;

    public BasicClassThreadExample()
    {
        _SynchronizationContext = System.ComponentModel.AsyncOperationManager.SynchronizationContext;
    }

    public void Start()
    {
        _doWorkThread = _doWorkThread ?? new System.Threading.Thread(dowork);

        if (!(_doWorkThread.IsAlive))
        {
            _doWorkThread = new System.Threading.Thread(dowork);
            _doWorkThread.IsBackground = true;
            _doWorkThread.Start();
        }
    }

    public void dowork()
    {
        string[] retval = System.IO.Directory.GetFiles(@"C:\Windows\System32", "*.*", System.IO.SearchOption.TopDirectoryOnly);
        foreach (var item in retval)
        {
            System.Threading.Thread.Sleep(25);
            _SynchronizationContext.Post(new System.Threading.SendOrPostCallback(delegate(object obj)
            {
                OnMessageReceivedEvent(item);
            }), null);
        }
    }

    protected virtual void Dispose(bool disposing)
    {
        if (!disposed)
        {
            if (disposing)
            {
                _doWorkThread.Abort();
            }
            disposed = true;
        }
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    ~BasicClassThreadExample() { Dispose(false); }

}

您需要在GUI线程上调用该方法。您可以通过调用Control.Invoke来实现这一点。

例如：

delegate void UpdateLabelDelegate (string message);

void UpdateLabel (string message)
{
    if (InvokeRequired)
    {
         Invoke (new UpdateLabelDelegate (UpdateLabel), message);
         return;
    }

    MyLabelControl.Text = message;
}

我想添加一个警告，因为我注意到一些简单的解决方案忽略了InvokeRequired检查。

我注意到，如果您的代码在创建控件的窗口句柄之前（例如，在显示表单之前）执行，Invoke会抛出异常。因此，我建议在调用Invoke或BeginInvoke之前始终检查InvokeRequired。

只需使用以下内容：

 this.Invoke((MethodInvoker)delegate
            {
                progressBar1.Value = e.ProgressPercentage; // runs on UI thread
            });

为了在WPF中实现这一点，我采用以下方式。

 new Thread(() => 
 {
     while (...)
     {
         SomeLabel.Dispatcher.BeginInvoke((Action)(() => SomeLabel.Text = ...));
     }
 }).Start();

必须使用invoke和delegate

private delegate void MyLabelDelegate();
label1.Invoke( new MyLabelDelegate(){ label1.Text += 1; });