public static async void Start(DownloadInfo info, IDownloadManagerListener managerListener)
{
try
{
var file = await GetFileSize(info);
info.FileSize = file.Item2;
if (string.IsNullOrEmpty(info.Name))
{
info.Name = file.Item1;
}
info.Listener.OnDownloadStart(info);
if (info.FileSize > _multiThreadMinSize)
{
Task.Run(() => DownloadWithMultiThreed(info, managerListener));
}
else if (info.FileSize > 0)
{
Task.Run(() => DownloadWithSingleThreed(info, managerListener));
}
else
{
DownloadUnKownSizeFile(info, managerListener);
}
}
catch (Exception ex)
{
Logger.LogHelper.Error("下载文件出错", ex);
info.Exception = ex;
info.Message = ex.Message;
info.Listener.OnDownloadFailed(info);
}
}
private static async void DownloadUnKownSizeFile(DownloadInfo info, IDownloadManagerListener managerListener)
{
try
{
using (var httpClient = CreateHttpClient())
{
var response =
await
httpClient.GetAsync(info.Url, HttpCompletionOption.ResponseHeadersRead,
info.CancellationTokenSource.Token);
using (var stream = await response.Content.ReadAsStreamAsync())
{
var bytes = new byte[_bytesLength];
using (
var fileStream = new FileStream(Path.Combine(info.Url, info.Name), FileMode.Append,
FileAccess.Write))
{
int writeLength;
stream.Position = fileStream.Length;
while ((writeLength = (stream.Read(bytes, 0, _bytesLength))) > 0)
{
if (info.CancellationTokenSource.Token.IsCancellationRequested)
{
info.DownloadStatus = DownloadStatus.UnDownload;
info.Listener.OnDownloadCancled(info);
break;
}
fileStream.Write(bytes, 0, writeLength);
info.DownloadSize += writeLength;
info.Listener.OnDownloadProgress(info);
}
fileStream.Flush();
fileStream.Close();
stream.Flush();
stream.Close();
}
if (info.DownloadStatus == DownloadStatus.Downloading)
{
info.DownloadStatus = DownloadStatus.Downloaded;
info.Listener.OnDownloadCompleted(info);
managerListener.OnDownloadCompleted(info);
}
}
}
}
catch (Exception ex)
{
Logger.LogHelper.Error("下载文件出错", ex);
info.Exception = ex;
info.Message = ex.Message;
info.DownloadStatus = DownloadStatus.DownloadFailed;
info.Listener.OnDownloadFailed(info);
}
}
/// <summary>
/// 单线程下载
/// </summary>
/// <param name="info"></param>
/// <param name="managerListener"></param>
public static async void DownloadWithSingleThreed(DownloadInfo info, IDownloadManagerListener managerListener)
{
try
{
var contentLength = info.FileSize;
if (info.FileSize <= 0 || string.IsNullOrEmpty(info.Name))
{
var file = await GetFileSize(info);
if (string.IsNullOrEmpty(info.Name))
{
info.Name = file.Item1;
}
if (file.Item2 <= 0)
{
DownloadUnKownSizeFile(info, managerListener);
return;
}
}
if (string.IsNullOrEmpty(info.Name))
{
info.Name = Guid.NewGuid().ToString();
}
info.Listener.OnDownloadStart(info);
using (var httpClient = CreateHttpClient())
{
if (!Directory.Exists(info.SavePath))
{
Directory.CreateDirectory(info.SavePath);
}
using (var fileStream = new FileStream(Path.Combine(info.SavePath, info.Name), FileMode.Append, FileAccess.Write))
{
var bytes = new byte[_bytesLength];
var beginSecond = DateTime.Now.Second;
if (fileStream.Length >= contentLength)
{
info.Listener.OnDownloadCompleted(info);
managerListener.OnDownloadCompleted(info);
return;
}
httpClient.DefaultRequestHeaders.Add("Range", "bytes = " + fileStream.Length + " - " + (contentLength - 1));
contentLength -= fileStream.Length;
var response = await httpClient.GetAsync(info.Url, info.CancellationTokenSource.Token);
using (var stream = await response.Content.ReadAsStreamAsync())
{
int writeLength;
var readLength = _bytesLength;
if (readLength != -1 && contentLength < readLength)
{
readLength = (int)contentLength;
}
while ((writeLength = (stream.Read(bytes, 0, readLength))) > 0)
{
if (info.CancellationTokenSource.Token.IsCancellationRequested)
{
info.Listener.OnDownloadCancled(info);
}
fileStream.Write(bytes, 0, writeLength);
info.DownloadSize += writeLength;
info.Progress = info.DownloadSize / contentLength;
if (beginSecond != DateTime.Now.Second)
{
info.Speed = writeLength / (DateTime.Now.Second - beginSecond) / 1024;
}
info.Listener.OnDownloadProgress(info);
contentLength -= writeLength;
if (contentLength <= 0)
{
info.DownloadStatus = DownloadStatus.Downloaded;
info.Listener.OnDownloadCompleted(info);
managerListener.OnDownloadCompleted(info);
}
}
stream.Flush();
stream.Close();
}
fileStream.Flush();
fileStream.Close();
}
}
}
catch (Exception ex)
{
Logger.LogHelper.Error("下载文件出错", ex);
info.Message = ex.Message;
info.Exception = ex;
info.DownloadStatus = DownloadStatus.DownloadFailed;
info.Listener.OnDownloadFailed(info);
managerListener.OnDownloadFailed(info);
}
}
public static async void DownloadWithMultiThreed(DownloadInfo info, IDownloadManagerListener managerListener)
{
try
{
var contentLength = info.FileSize;
if (info.FileSize <= 0 || string.IsNullOrEmpty(info.Name))
{
var file = await GetFileSize(info);
if (string.IsNullOrEmpty(info.Name))
{
info.Name = file.Item1;
}
if (file.Item2 <= 0)
{
DownloadUnKownSizeFile(info, managerListener);
return;
}
}
if (string.IsNullOrEmpty(info.Name))
{
info.Name = Guid.NewGuid().ToString();
}
info.Listener.OnDownloadStart(info);
var fileInfo = new FileInfo {
FileLength = contentLength
};
if (_downloadingFiles.ContainsKey(info.Url))
{
_downloadingFiles.Remove(info.Url);
}
_downloadingFiles.Add(info.Url, fileInfo);
int taskCount = (int)(_downloadingFiles[info.Url].FileLength / _oneThreadSize);
var tasks = new List <Task>();
for (int i = 0; i < _maxThread; i++)
{
if (taskCount <= 0)
{
break;
}
taskCount--;
var t = Task.Run(async() => { await DownloadChunk(info); });
tasks.Add(t);
}
Task.WaitAll(tasks.ToArray());
if (info.DownloadStatus == DownloadStatus.Downloading)
{
MergeFile(info);
info.DownloadStatus = DownloadStatus.Downloaded;
info.Listener.OnDownloadCompleted(info);
managerListener.OnDownloadCompleted(info);
}
}
catch (Exception ex)
{
Logger.LogHelper.Error("下载文件出错", ex);
if (info.Message == null)
{
info.Exception = ex;
info.Message = ex.Message;
}
info.DownloadStatus = DownloadStatus.DownloadFailed;
info.Listener.OnDownloadFailed(info);
managerListener.OnDownloadFailed(info);
}
}
