这是您应该采用的经典方法：

using System;
using System.Windows.Forms;
using System.Threading;

namespace Test
{
    public partial class UIThread : Form
    {
        Worker worker;

        Thread workerThread;

        public UIThread()
        {
            InitializeComponent();

            worker = new Worker();
            worker.ProgressChanged += new EventHandler<ProgressChangedArgs>(OnWorkerProgressChanged);
            workerThread = new Thread(new ThreadStart(worker.StartWork));
            workerThread.Start();
        }

        private void OnWorkerProgressChanged(object sender, ProgressChangedArgs e)
        {
            // Cross thread - so you don't get the cross-threading exception
            if (this.InvokeRequired)
            {
                this.BeginInvoke((MethodInvoker)delegate
                {
                    OnWorkerProgressChanged(sender, e);
                });
                return;
            }

            // Change control
            this.label1.Text = e.Progress;
        }
    }

    public class Worker
    {
        public event EventHandler<ProgressChangedArgs> ProgressChanged;

        protected void OnProgressChanged(ProgressChangedArgs e)
        {
            if(ProgressChanged!=null)
            {
                ProgressChanged(this,e);
            }
        }

        public void StartWork()
        {
            Thread.Sleep(100);
            OnProgressChanged(new ProgressChangedArgs("Progress Changed"));
            Thread.Sleep(100);
        }
    }


    public class ProgressChangedArgs : EventArgs
    {
        public string Progress {get;private set;}
        public ProgressChangedArgs(string progress)
        {
            Progress = progress;
        }
    }
}

工作线程有一个事件。UI线程启动另一个线程来完成工作，并挂接该工作线程事件，以便显示工作线程的状态。

然后在UI中，您需要跨线程来更改实际控件。。。如标签或进度条。

激发并忘记.NET 3.5的扩展方法+

using System;
using System.Windows.Forms;

public static class ControlExtensions
{
    /// <summary>
    /// Executes the Action asynchronously on the UI thread, does not block execution on the calling thread.
    /// </summary>
    /// <param name="control"></param>
    /// <param name="code"></param>
    public static void UIThread(this Control @this, Action code)
    {
        if (@this.InvokeRequired)
        {
            @this.BeginInvoke(code);
        }
        else
        {
            code.Invoke();
        }
    }
}

这可以使用以下代码行调用：

this.UIThread(() => this.myLabel.Text = "Text Goes Here");

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); }

}

您必须确保更新发生在正确的线程上；UI线程。

为了做到这一点，您必须调用事件处理程序，而不是直接调用它。

您可以通过以下方式发起活动：

（代码是在我的脑海中打出来的，所以我没有检查语法等是否正确，但它应该能让你继续。）

if( MyEvent != null )
{
   Delegate[] eventHandlers = MyEvent.GetInvocationList();

   foreach( Delegate d in eventHandlers )
   {
      // Check whether the target of the delegate implements 
      // ISynchronizeInvoke (Winforms controls do), and see
      // if a context-switch is required.
      ISynchronizeInvoke target = d.Target as ISynchronizeInvoke;

      if( target != null && target.InvokeRequired )
      {
         target.Invoke (d, ... );
      }
      else
      {
          d.DynamicInvoke ( ... );
      }
   }
}

请注意，上面的代码在WPF项目上不起作用，因为WPF控件不实现ISynchronizeInvoke接口。

为了确保上面的代码适用于Windows窗体和WPF以及所有其他平台，您可以查看AsyncOperation、AsyncOperationManager和SynchronizationContext类。

为了以这种方式轻松地引发事件，我创建了一个扩展方法，它允许我通过调用以下命令来简化引发事件：

MyEvent.Raise(this, EventArgs.Empty);

当然，您也可以使用BackGroundWorker类，它将为您抽象这个问题。

在我的案例（WPF）中，解决方案简单如下：

private void updateUI()
{
    if (!Dispatcher.CheckAccess())
    {
        Dispatcher.BeginInvoke(updateUI);
        return;
    }

    // Update any number of controls here
}

例如，访问当前线程以外的控件：

Speed_Threshold = 30;
textOutput.Invoke(new EventHandler(delegate
{
    lblThreshold.Text = Speed_Threshold.ToString();
}));

lblThreshold是一个标签，Speed_Threshold则是一个全局变量。