private void ProgressTimer_Callback(object state)
{
long workID = (long)state;
DownloadProgressArgs args;
// 获取下载状态
lock (this._syncRoot)
{
if (workID != this._workID)
{
return; // 这次下载已经过期
}
var segments = this._writer.GetSegments();
args = new DownloadProgressArgs(segments);
var now = DateTime.Now;
args.Speed = (args.DownloadedSize - this._lastDownloadedSize) / Math.Max(1, (long)(now - this._lastProgressChangeTime).TotalSeconds);
this._lastProgressChangeTime = now;
this._lastDownloadedSize = args.DownloadedSize;
}// lock
// 触发进度改变事件
this.OnProgressChanged(args);
// 启动下一次进度计时
lock (this._syncRoot)
{
if (workID != this._workID)
{
return; // 这次下载已经过期
}
this._progressTimer.Change(ProgressTimerInterval, Timeout.Infinite);
}
}
private void OnProgressChanged(DownloadProgressArgs e)
{
EventHandler <DownloadProgressArgs> handler = this.ProgressChanged;
if (handler != null)
{
handler(this, e);
}
}
