/// <summary>
/// Reads the Atom feed at <see cref="ReleaseUpdateUri"/> and fills the <see cref="Releases"/>
/// collection with information. If a release with higher version number than <see cref="ApplicationVersion"/>
/// is found then the <see cref="ReleaseToUpdate"/> is set to this release.
/// </summary>
/// <param name="force"></param>
/// <returns></returns>
public async Task <bool> CheckForUpdate(bool force = false)
{
EnsureUpdateEntry();
if (updateEntry.LastCheck == DateTime.Today && !force)
{
return(false);
}
try
{
using (var cl = new HttpClient())
{
var response = await cl.GetAsync(ReleaseUpdateUri);
response.EnsureSuccessStatusCode();
using (var xmlReader = XmlReader.Create(await response.Content.ReadAsStreamAsync(),
new XmlReaderSettings
{
Async = true
}))
{
Releases.Clear();
ReleaseToUpdate = null;
var feedReader = new AtomFeedReader(xmlReader);
while (await feedReader.Read())
{
switch (feedReader.ElementType)
{
case SyndicationElementType.Category:
await feedReader.ReadCategory();
break;
case SyndicationElementType.Image:
await feedReader.ReadImage();
break;
case SyndicationElementType.Item:
var entry = await feedReader.ReadEntry();
var r = new Release();
r.DownloadUri = entry.Links.FirstOrDefault(x => x.RelationshipType == "alternate")?.Uri;
if (r.DownloadUri != null)
{
r.Updated = entry.LastUpdated.ToUniversalTime().LocalDateTime;
r.ParsedVersion = ParseVersion(r.DownloadUri.AbsolutePath);
if (r.ParsedVersion != null)
{
Releases.Add(r);
}
}
break;
case SyndicationElementType.Link:
await feedReader.ReadLink();
break;
case SyndicationElementType.Person:
await feedReader.ReadPerson();
break;
default:
await feedReader.ReadContent();
break;
}
}
if (Releases.Count == 0)
{
return(false);
}
var top = Releases.OrderByDescending(x => x.ParsedVersion).First();
if (top.ParsedVersion > ApplicationVersion)
{
ReleaseToUpdate = top;
return(true);
}
}
}
}
catch (Exception ex)
{
LogException(ex);
return(false);
}
updateEntry.LastCheck = DateTime.Today;
SaveUpdateEntry();
return(false);
}