在这个问题上，大多数其他答案对我来说都有点复杂（我是C#新手），所以我写了我的答案：

我有一个WPF应用程序，并定义了如下工作人员：

问题：

BackgroundWorker workerAllocator;
workerAllocator.DoWork += delegate (object sender1, DoWorkEventArgs e1) {
    // This is my DoWork function.
    // It is given as an anonymous function, instead of a separate DoWork function

    // I need to update a message to textbox (txtLog) from this thread function

    // Want to write below line, to update UI
    txt.Text = "my message"

    // But it fails with:
    //  'System.InvalidOperationException':
    //  "The calling thread cannot access this object because a different thread owns it"
}

解决方案：

workerAllocator.DoWork += delegate (object sender1, DoWorkEventArgs e1)
{
    // The below single line works
    txtLog.Dispatcher.BeginInvoke((Action)(() => txtLog.Text = "my message"));
}

我还没有弄清楚上面这句话的意思，但它奏效了。

对于WinForms：

解决方案：

txtLog.Invoke((MethodInvoker)delegate
{
    txtLog.Text = "my message";
});

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;
}

即使操作很耗时（在我的示例中为thread.sleep）-此代码不会锁定您的UI：

 private void button1_Click(object sender, EventArgs e)
 {

      Thread t = new Thread(new ThreadStart(ThreadJob));
      t.IsBackground = true;
      t.Start();         
 }

 private void ThreadJob()
 {
     string newValue= "Hi";
     Thread.Sleep(2000); 

     this.Invoke((MethodInvoker)delegate
     {
         label1.Text = newValue; 
     });
 }

最简单的方法是调用如下：

 Application.Current.Dispatcher.Invoke(new Action(() =>
             {
                    try
                    {
                        ///
                    }
                    catch (Exception)
                    {
                      //
                    }


                    }
     ));

只需使用以下内容：

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

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。