private void CheckForUpdateAsync(object state)
{
if (state == null)
{
if (DateTime.UtcNow < _lastUpdateCheckedOn.AddDays(_checkUpdateIntervalDays))
return;
}
//update last check time
_lastUpdateCheckedOn = DateTime.UtcNow;
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_checkUpdateURL);
request.UserAgent = GetUserAgent();
request.IfModifiedSince = _lastModifiedGMT;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
switch (response.StatusCode)
{
case HttpStatusCode.OK:
_updateInfo = new UpdateInfo(response.GetResponseStream());
_lastModifiedGMT = DateTime.Parse(response.Headers["Last-Modified"]);
if (_updateInfo.IsUpdateAvailable(_currentVersion))
{
//update available, stop timer
_checkTimer.Change(Timeout.Infinite, Timeout.Infinite);
//raise event to user UI
RaiseEventUpdateAvailable();
}
else
{
//if manual check then raise event
if (state != null)
RaiseEventNoUpdateAvailable();
}
break;
default:
//if manual check then raise event
if (state != null)
RaiseEventNoUpdateAvailable();
break;
}
}
catch (WebException ex)
{
HttpWebResponse response = ex.Response as HttpWebResponse;
if (response != null)
{
switch (response.StatusCode)
{
case HttpStatusCode.NotModified:
case HttpStatusCode.NotFound:
//if manual check then raise event
if (state != null)
RaiseEventNoUpdateAvailable();
break;
default:
//if manual check then raise event
if (state != null)
RaiseEventUpdateError(ex);
break;
}
}
else
{
//if manual check then raise event
if (state != null)
RaiseEventUpdateError(ex);
}
}
catch (Exception ex)
{
//if manual check then raise event
if (state != null)
RaiseEventUpdateError(ex);
}
if (state != null)
_checkUpdate = null;
}
private void CheckForUpdateAsync(object state)
{
if (state == null)
{
if (DateTime.UtcNow < _lastUpdateCheckedOn.AddDays(_checkUpdateIntervalDays))
{
return;
}
}
//update last check time
_lastUpdateCheckedOn = DateTime.UtcNow;
try
{
using (WebClientEx client = new WebClientEx())
{
client.Proxy = _proxy;
client.UserAgent = GetUserAgent();
client.IfModifiedSince = _lastModifiedGMT;
byte[] responseData = client.DownloadData(_checkUpdateURL);
_updateInfo = new UpdateInfo(new MemoryStream(responseData, false));
_lastModifiedGMT = DateTime.Parse(client.ResponseHeaders["Last-Modified"]);
if (_updateInfo.IsUpdateAvailable(_currentVersion))
{
//update available, stop timer
_checkTimer.Change(Timeout.Infinite, Timeout.Infinite);
//raise event to user UI
RaiseEventUpdateAvailable();
}
else
{
//if manual check then raise event
if (state != null)
{
RaiseEventNoUpdateAvailable();
}
}
}
}
catch (WebException ex)
{
HttpWebResponse response = ex.Response as HttpWebResponse;
if (response != null)
{
switch (response.StatusCode)
{
case HttpStatusCode.NotModified:
case HttpStatusCode.NotFound:
//if manual check then raise event
if (state != null)
{
RaiseEventNoUpdateAvailable();
}
break;
default:
//if manual check then raise event
if (state != null)
{
RaiseEventUpdateError(ex);
}
break;
}
}
else
{
//if manual check then raise event
if (state != null)
{
RaiseEventUpdateError(ex);
}
}
}
catch (Exception ex)
{
//if manual check then raise event
if (state != null)
{
RaiseEventUpdateError(ex);
}
}
if (state != null)
{
_checkUpdate = null;
}
}