創建另一個線程來獲取當前窗口（System.Windows.Application.Current.MainWindow）

Question

我需要當前窗口來顯示一個自定義的MessageBox。我這樣做：

Window owner = System.Windows.Application.Current.MainWindow; 

有時它的工作原理。當它不工作，我得到這個錯誤：

System.InvalidOperationException: {"The calling thread cannot access this object because a different thread owns it."} 
InnerException: null 
Message: The calling thread cannot access this object because a different thread owns it. 

會解決是踢這個調用關閉以比主線程一個單獨的線程？如果是這樣，我該怎麼做？謝謝。

Answer 1

你需要使用的調度和調用/的BeginInvoke封送回調到UI線程：

System.Windows.Application.Current.Dispatcher.Invoke((Action)() => 
{ 
     Window owner = System.Windows.Application.Current.MainWindow; 

     // Use owner here - it must be used on the UI thread as well.. 
     ShowMyWindow(owner); 
});