/// <summary>
/// 下载文件方法（自动确定是否使用分片下载）
/// </summary>
/// <param name="fileEnumerable">文件列表</param>
/// <param name="downloadParts"></param>
public static async Task AdvancedDownloadListFile(IEnumerable <DownloadFile> fileEnumerable,
int downloadParts = 16)
{
ProcessorHelper.SetMaxThreads();
var filesBlock =
new TransformManyBlock <IEnumerable <DownloadFile>, DownloadFile>(d =>
{
var dl = d.ToList();
foreach (var df in dl.Where(df => !Directory.Exists(df.DownloadPath)))
{
Directory.CreateDirectory(df.DownloadPath);
}
return(dl);
});
var actionBlock = new ActionBlock <DownloadFile>(async d =>
{
if (d.FileSize is >= 1048576 or 0)
{
await MultiPartDownloadTaskAsync(d, downloadParts);
}
/// <summary>
/// 下载文件方法（自动确定是否使用分片下载）
/// </summary>
/// <param name="fileEnumerable">文件列表</param>
/// <param name="downloadThread">下载线程</param>
/// <param name="tokenSource"></param>
public static async Task AdvancedDownloadListFile(IEnumerable <DownloadFile> fileEnumerable, int downloadThread,
CancellationTokenSource tokenSource, int downloadParts = 16)
{
var downloadFiles = fileEnumerable.ToList();
var token = tokenSource?.Token ?? CancellationToken.None;
var processorCount = ProcessorHelper.GetPhysicalProcessorCount();
if (downloadThread <= 0)
{
downloadThread = processorCount;
}
using var bc = new BlockingCollection <DownloadFile>(downloadThread * 4);
using var downloadQueueTask = Task.Run(() =>
{
foreach (var df in downloadFiles)
{
bc.Add(df, token);
}
bc.CompleteAdding();
}, token);
using var downloadTask = Task.Run(() =>
{
void DownloadAction()
{
foreach (var df in bc.GetConsumingEnumerable())
{
var di = new DirectoryInfo(
df.DownloadPath.Substring(0, df.DownloadPath.LastIndexOf('\\')));
if (!di.Exists)
{
di.Create();
}
// DownloadData(df);
if (df.FileSize >= 1048576 || df.FileSize == 0) // || df.FileSize == default)
{
MultiPartDownload(df, downloadParts);
}
else
{
DownloadData(df);
}
}
}
var threads = new List <Thread>();
for (var i = 0; i < downloadThread * 2; i++)
{
threads.Add(new Thread(DownloadAction));
}
foreach (var t in threads)
{
t.Start();
}
foreach (var t in threads)
{
t.Join();
}
}, token);
await Task.WhenAll(downloadQueueTask, downloadTask).ConfigureAwait(false);
}
