如何更新命令'；s"；CanExecute"；来自不同线程的值

在我的应用程序中，我有一个命令，我只希望用户在尚未运行时能够触发它。有问题的命令绑定到一个WPF按钮，这意味着如果CanExecute为false，它会自动禁用该按钮。到目前为止还不错。

不幸的是，该命令执行的操作运行时间很长，因此需要在不同的线程上执行。我不认为这会是个问题。。。但看起来确实如此。

我提取了一个最小的样本来说明这个问题。如果绑定到按钮(通过LocalCommands.Problem静态引用(，该按钮将根据需要被禁用。当工作线程尝试更新CanExecute时，将从System.Windows.Controls.Primitives.ButtonBase.内部引发InvalidOperationException

解决这个问题最合适的方法是什么？

下面的示例命令代码：

using System;
using System.Threading;
using System.Windows.Input;
namespace InvalidOperationDemo
{
    static class LocalCommands
    {
        public static ProblemCommand Problem = new ProblemCommand();
    }
    class ProblemCommand : ICommand
    {
        private bool currentlyRunning = false;
        private AutoResetEvent synchronize = new AutoResetEvent(false);
        public bool CanExecute(object parameter)
        {
            return !CurrentlyRunning;
        }
        public void Execute(object parameter)
        {
            CurrentlyRunning = true;
            ThreadPool.QueueUserWorkItem(ShowProblem);
        }
        private void ShowProblem(object state)
        {
            // Do some work here. When we're done, set CurrentlyRunning back to false.
            // To simulate the problem, wait on the never-set synchronization object.
            synchronize.WaitOne(500);
            CurrentlyRunning = false;
        }
        public bool CurrentlyRunning
        {
            get { return currentlyRunning; }
            private set
            {
                if (currentlyRunning == value) return;
                currentlyRunning = value;
                var onCanExecuteChanged = CanExecuteChanged;
                if (onCanExecuteChanged != null)
                {
                    try
                    {
                        onCanExecuteChanged(this, EventArgs.Empty);
                    }
                    catch (Exception e)
                    {
                        System.Windows.MessageBox.Show(e.Message, "Exception in event handling.");
                    }
                }
            }
        }
        public event EventHandler CanExecuteChanged;
    }
}

Application.Current.Dispatcher.BeginInvoke((Action)(onCanExecuteChanged(this, EventArgs.Empty)));