先上代碼：
[csharp]
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
Thread t = new Thread(new ParameterizedThreadStart(threadTest));
t.Start(@"C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg");
}
void threadTest(object obj)
{
string path = obj as string;
this.Dispatcher.Invoke(new Func<object>(() => this.Background = new ImageBrush(new BitmapImage(new Uri(path)))));
}
}
上面這段代碼可以正確運行，但是該成如下形式的就錯誤了：
[html]
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
Thread t = new Thread(new ParameterizedThreadStart(threadTest));
t.Start(@"C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg");
}
void threadTest(object obj)
{
string path = obj as string;
//this.Dispatcher.Invoke(new Func<object>(() => this.Background = new ImageBrush(new BitmapImage(new Uri(path)))));
ImageBrush background = new ImageBrush(new BitmapImage(new Uri(path)));
this.Dispatcher.Invoke(new Func<object>(() => this.Background = background));
}
}
兩個代碼的唯一區別是，前一個代碼在主線程中創建ImageBrush對象，而後一個代碼在子線程中創建ImageBrush對象。
難道WPF中，所有線程只能調用本線程創建的對象嗎？
