public ServerFileInfo GetFileInfo(string url)
{
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
ServerFileInfo fileinfo = new ServerFileInfo();
fileinfo.ResponseUri = response.ResponseUri;
fileinfo.FileType = response.ContentType;
fileinfo.FileSize = response.ContentLength;
fileinfo.LastModified = response.LastModified;
fileinfo.Method = response.Method;
fileinfo.Server = response.Server;
fileinfo.AcceptRange = string.Compare(response.Headers["Accept-Ranges"], "bytes", true) == 0;
fileinfo.StatueCode = response.StatusCode;
fileinfo.CharacterSet = response.CharacterSet;
fileinfo.ContentEncoding = response.ContentEncoding;
fileinfo.ProtocolVersion = response.ProtocolVersion.ToString();
fileinfo.StatusDescription = response.StatusDescription;
response.Close();
return fileinfo;
}
/// <summary>
/// 开始暂停的任务
/// </summary>
private void StartPrepared()
{
int errorTime = 0;
try
{
do
{
errorTime++;
try
{
serverFileInfo = httpManager.GetFileInfo(url);
break;
}
catch
{
if (errorTime < Settings.Default.MaxConnect)
{
SetState(DownloadState.WaitForConnect);
Thread.Sleep(TimeSpan.FromMilliseconds(Settings.Default.RetryDelay));
}
else
{
return;
}
}
} while (true);
}
finally
{
SetState(DownloadState.prepared);
}
StartSegments();
}
private void StartNeedToPrepare()
{
int errorTime = 0;
SetState(DownloadState.Preparing);
do
{
if (state == DownloadState.pausing)
{
SetState(DownloadState.NeedToPrepare);
return;
}
SetState(DownloadState.Preparing);
errorTime++;
try
{
serverFileInfo = httpManager.GetFileInfo(url);
if ((HttpStatusCode)serverFileInfo.StatueCode == HttpStatusCode.OK)
{
break;
}
}
catch (ThreadAbortException)
{
SetState(DownloadState.NeedToPrepare);
return;
}
catch (Exception ex)
{
if (errorTime < Settings.Default.MaxConnect)
{
SetState(DownloadState.WaitForConnect);
Thread.Sleep(TimeSpan.FromMilliseconds(Settings.Default.RetryDelay));
}
else
{
SetState(DownloadState.NeedToPrepare);
return;
}
}
} while (true);
try
{
CreateSegments();
}
catch(ThreadAbortException)
{
throw;
}
catch
{
SetState(DownloadState.EndedWithError);
}
}