使用Dispatcher更改标签的前景会引发异常

Dispatcher 更改其 Content 和 ToolTip 价值观,但我不能改变它 Foreground

无效操作异常 :

这是我的代码:

private void SetPing(Brush foreground, string content, string tooltip)
{
    try
    {
        this.Dispatcher.BeginInvoke(DispatcherPriority.Send, (Action)(() =>
        {
            this.Ping.Content = content;
            this.Ping.ToolTip = tooltip;
        }));

        // this.Dispatcher or this.Ping.Dispatcher throws the same error
        this.Ping.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
        {
            this.Ping.Foreground = foreground;
        }));
    }
    catch (Exception)
    {
    }
}

我从 PerformPing 此处的方法:

new Thread(() =>
{
    while (true)
    {
        this.PerformPing(this.Host);
        Thread.Sleep(1);
    }
}).Start();