我无法理解这一丑陋实现背后的微软逻辑，但你必须有两个功能：

void setEnableLoginButton()
{
  if (InvokeRequired)
  {
    // btn_login can be any conroller, (label, button textbox ..etc.)

    btn_login.Invoke(new MethodInvoker(setEnable));

    // OR
    //Invoke(new MethodInvoker(setEnable));
  }
  else {
    setEnable();
  }
}

void setEnable()
{
  btn_login.Enabled = isLoginBtnEnabled;
}

这些片段对我有用，所以我可以在另一个线程上执行一些操作，然后更新GUI：

Task.Factory.StartNew(()=>
{
    // THIS IS NOT GUI
    Thread.Sleep(5000);
    // HERE IS INVOKING GUI
    btn_login.Invoke(new Action(() => DoSomethingOnGUI()));
});

private void DoSomethingOnGUI()
{
   // GUI
   MessageBox.Show("message", "title", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}

更简单的是：

btn_login.Invoke(new Action(()=>{ /* HERE YOU ARE ON GUI */ }));

最简单的方法是调用如下：

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


                    }
     ));

创建类变量：

SynchronizationContext _context;

在创建UI的构造函数中设置它：

var _context = SynchronizationContext.Current;

要更新标签时：

_context.Send(status =>{
    // UPDATE LABEL
}, null);

只使用ui的同步上下文

using System.Threading;

// ...

public partial class MyForm : Form
{
    private readonly SynchronizationContext uiContext;

    public MyForm()
    {
        InitializeComponent();
        uiContext = SynchronizationContext.Current; // get ui thread context
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Thread t = new Thread(() =>
            {// set ui thread context to new thread context                            
             // for operations with ui elements to be performed in proper thread
             SynchronizationContext
                 .SetSynchronizationContext(uiContext);
             label1.Text = "some text";
            });
        t.Start();
    }
}

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。

这是一个古老问题的新视角，使用了更实用的风格。如果您在所有项目中都保留TaskXM类，那么只有一行代码不再担心跨线程更新。

public class Example
{
    /// <summary>
    /// No more delegates, background workers, etc. Just one line of code as shown below.
    /// Note it is dependent on the Task Extension method shown next.
    /// </summary>
    public async void Method1()
    {
        // Still on the GUI thread here if the method was called from the GUI thread
        // This code below calls the extension method which spins up a new task and calls back.
        await TaskXM.RunCodeAsync(() =>
        {
            // Running an asynchronous task here
            // Cannot update the GUI thread here, but can do lots of work
        });
        // Can update GUI on this line
    }
}


/// <summary>
/// A class containing extension methods for the Task class
/// </summary>
public static class TaskXM
{
    /// <summary>
    /// RunCodeAsyc is an extension method that encapsulates the Task.run using a callback
    /// </summary>
    /// <param name="Code">The caller is called back on the new Task (on a different thread)</param>
    /// <returns></returns>
    public async static Task RunCodeAsync(Action Code)
    {
        await Task.Run(() =>
        {
            Code();
        });
        return;
    }
}