因此,我正在构建一个 WPF 控件,该控件需要从磁盘加载(并显示)400 到 600 个图像(每个图像的大小约为 200Kb)。接下来是控件的代码隐藏。
private List<BitmapImage> pages = new List<BitmapImage>();
private BackgroundWorker worker;
public PagesListBox()
{
InitializeComponent();
worker = new BackgroundWorker();
worker.WorkerSupportsCancellation = false;
worker.WorkerReportsProgress = false;
worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
}
void worker_DoWork(object sender, DoWorkEventArgs e)
{
List<BitmapImage> pagesList = new List<BitmapImage>();
var files = DirectoryServices.GetFiles(Properties.Settings.Default.PagesScanDirectory, new string[] { "*.tiff", "*.jpg", "*.png", "*.bmp" });
foreach (var file in files)
{
Uri uri = new Uri(file);
pagesList.Add(new BitmapImage(uri));
}
e.Result = pagesList;
}
void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
Pages.ItemsSource = (List<BitmapImage>)e.Result;
}
internal void LoadPages()
{
worker.RunWorkerAsync();
}
internal List<BitmapImage> AttachPages()
{
List<BitmapImage> attachedPages = new List<BitmapImage>();
foreach (BitmapImage eachItem in Pages.SelectedItems)
{
attachedPages.Add(eachItem);
pages.Remove(eachItem);
}
Pages.ItemsSource = null;
Pages.ItemsSource = pages;
return attachedPages;
}
我尝试将页面列表分配给视图(我不能使用后台工作人员),但它失败了。
是否有任何其他方式来异步加载图像(也许更新 UI)或者我正在尝试的这种后台工作方法很好。而且,如果没问题,我该如何解决异常(在完成的事件中):
Must create DependencySource on same Thread as the DependencyObject.
谢谢