5
我有自定义对象的集合称为DataItems包含图像0的URI的,我想加载,并把收集在我的Silverlight应用程序中使用。如何通过WebClient请求传递信息来识别被加载的对象?
当我处理每个DataItem的,我得到它的SourceUri(例如 “http://..../picture001.png”),并启动它装载:
void LoadNext()
{
WebClient webClientImgDownloader = new WebClient();
if (loadedItemIndex < RegisteredDataEntries.Count())
{
DataItem dataItem = RegisteredDataEntries[registeredIdCodes[loadedItemIndex]];
if (dataItem.Kind == DataItemKind.Image)
{
webClientImgDownloader.OpenReadCompleted +=
new OpenReadCompletedEventHandler(webClientImgDownloader_OpenReadCompleted);
webClientImgDownloader.OpenReadAsync(new Uri(dataItem.SourceUri,
UriKind.Absolute));
webClientImgDownloader.AddObject(dataItem); //????????????????????
webClientImgDownloader.Headers["idCode"] = dataItem.IdCode; //?????????????
webClientImgDownloader.ResponseHeaders["idCode"] = dataItem.IdCode; //?????????????
}
}
else
{
OnLoadingComplete(this, null);
}
}
然后,当该图像的加载已完成,我救
void webClientImgDownloader_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
dataItemIdCode = e.DataItem.IdCode; //???????????????????
dataitemIdCode = ((DataItem)sender).IdCode; //?????????????????????
BitmapImage bitmap = new BitmapImage();
bitmap.SetSource(e.Result);
Image image = new Image();
image.Source = bitmap;
Images.Add(dataItemIdCode, image);
}
:在集合图像但是,如何将当前DataItem的IdCode传递给我的OpenReadCompleted方法,以便当该图像完成加载后,我还可以根据其IdCode识别它?
答:
弗郎的建议的作品,这里是为别人寻找这::
webClientImgDownloader.OpenReadAsync(new Uri(dataItem.SourceUri,
UriKind.Absolute), dataItem);
...
DataItem dataItem = e.UserState as DataItem;
到底我在找什么,谢谢 – 2010-03-09 17:42:05