/// <summary>
/// 暂停，继续下载
/// </summary>
/// <param name="bstop"></param>
public void myTaskReStart(bool bstop)
{
try
{
if (bstop)
{
if (bolDownloadingFlag)
{
//webcDownloading.Suspend()
if (webcDownloading.IsBusy)
{
//取消异步下载
webcDownloading.CancelAsync();
//异步取消，直到IsBusy为False
while (webcDownloading.IsBusy)
{
//do something
if (bolItemDestroyed)
{
break;
}
}
}
}
}
else
{
// '如果开启了下载，且下载任务EventDone状态不为已完成，则继续下载，
// 'WebClient的异步下载文件已修改为支持断点续传
if (bolDownloadingFlag)
{
//已修改WebClient增加断点续传
DownloadFileAsync(this.DownloadUrl);
}
}
}
catch (Exception ex)
{
}
}