/// <summary>
/// 下载一个ImageModel并写入到本地(异步)
/// </summary>
/// <param name="imageModel"></param>
/// <returns>Task</returns>
private static async Task downloadAImageAndSave(ImageModel imageModel)
{
try
{
if (imageModel.ImageUrl != null)
{
Byte[] imageBytes = await HttpDownloader.DownloadBytes(imageModel.ImageUrl);
FileWriter.WriteToFile(imageBytes, imageModel.ImageSavePath);
}
}
catch (TaskCanceledException e)
{
Debug.WriteLine("失败：" + "下载二进制文件超时。" + imageModel.ImageUrl);
throw e;
}
catch (Exception e)
{
Debug.WriteLine("失败：" + imageModel.ImageUrl + " 下载失败，原因：" + e.Message);
throw e;
}
}
private static async Task ParseAndDownload(EbookPageModel webpage)
{
EbookPageModel page = await parser.FindEbookUrl(webpage);
//下载图书文件
int success = 0;
foreach (EbookFileModel ebook in page.EBooks)
{
try
{
byte[] file = await HttpDownloader.DownloadBytes(ebook.DownloadUrl);
FileWriter.WriteToFile(file, ebook.FileSavePath);
success++;
ebook.IsDownloaded = true;
DownloadFileCount++;
Debug.WriteLine("下载文件数量=" + DownloadFileCount);
}
catch (TaskCanceledException)
{
Debug.WriteLine("下载图书文件超时");
continue;
}
catch (HttpRequestException e)
{
Debug.WriteLine("访问图书下载连接失败：" + e.Message);
continue;
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
continue;
}
}
if (success == 0)
{
return;
}
//下载图书图片
try
{
byte[] imageBytes = await HttpDownloader.DownloadBytes(page.Image.ImageUrl);
FileWriter.WriteToFile(imageBytes, page.Image.ImageSavePath);
//如果图片下载成功，则填入地址，失败则为null
page.ImagePath = page.Image.ImageSavePath;
}
catch (TaskCanceledException)
{
Debug.WriteLine("下载图片超时");
}
catch (HttpRequestException e)
{
Debug.WriteLine("访问图片连接失败：" + e.Message);
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
}
//添加对象属性
page.FilePaths = string.Join(", ", page.EBooks.Where(x => x.IsDownloaded).Select(x => x.FileSavePath));
page.FileFormat = string.Join(", ", page.EBooks.Where(x => x.IsDownloaded).Select(x => x.FileExtention));
page.FileCount = page.EBooks.Where(x => x.IsDownloaded).Count();
//写入数据库
//using (var db=new MyAppDbContext())
//{
// db.Blogs.Add(page);
// db.SaveChanges();
// RecordCount++;
// Debug.WriteLine("写入记录条数=" + RecordCount);
//}
}