/// <summary>
/// Instructs the AutoUpdateDownloader to query for the latest version available
/// </summary>
/// <param name="progressViewer">The progress viewer by which progress should be displayed</param>
/// <param name="options">The options that affect this downloader</param>
/// <param name="productToUpdate">The product descriptor for the product that should be updated</param>
/// <param name="updateAvailable">The download descriptor that describes the download that could potentially occur</param>
/// <returns></returns>
public override bool QueryLatestVersion(IProgressViewer progressViewer, AutoUpdateOptions options, AutoUpdateProductDescriptor productToUpdate, out AutoUpdateDownloadDescriptor updateAvailable)
{
updateAvailable = null;
try
{
// create a manual web service proxy based on the url specified in the options
Debug.WriteLine(string.Format("Creating a web service proxy to the following url.\n\tThe web service url is '{0}'.", options.WebServiceUrl), MY_TRACE_CATEGORY);
AutoUpdateWebServiceProxy service = new AutoUpdateWebServiceProxy(options.WebServiceUrl);
// use the web service to query for updates
Debug.WriteLine(string.Format("Querying the web service for the latest version of '{0}'.\n\tThe current product's version is '{1}'.\n\tThe current product's id is '{2}'.\n\tThe web service url is '{3}'.", productToUpdate.Name, productToUpdate.Version.ToString(), productToUpdate.Id, options.WebServiceUrl), MY_TRACE_CATEGORY);
XmlNode node = service.QueryLatestVersion(productToUpdate.Name, productToUpdate.Version.ToString(), productToUpdate.Id);
// if the service returned no results, then there is no update availabe
if (node == null)
{
// bail out
Debug.WriteLine(string.Format("No updates are available from the web service at '{0}' for this product.", options.WebServiceUrl), MY_TRACE_CATEGORY);
return(false);
}
// otherwise create a reader and try and read the xml from the xml node returned from the web service
XmlAutoUpdateManifestReader reader = new XmlAutoUpdateManifestReader(node);
// using the reader we can recreate the manifeset from the xml
AutoUpdateManifest manifest = reader.Read();
/*
* now create a download descriptor that says, yes we have found an update.
* we are capable of downloading it, according to these options.
* the autoupdate manager will decide which downloader to use to download the update
* */
updateAvailable = new AutoUpdateDownloadDescriptor(manifest, this, options);
// just to let everyone know that there is a version available
Debug.WriteLine(string.Format("Version '{0}' of '{1}' is available for download.\n\tThe download url is '{2}'.\n\tThe size of the download is {3}.", updateAvailable.Manifest.Product.Version.ToString(), updateAvailable.Manifest.Product.Name, updateAvailable.Manifest.UrlOfUpdate, this.FormatFileLengthForDisplay(updateAvailable.Manifest.SizeOfUpdate)), MY_TRACE_CATEGORY);
// we've successfully queried for the latest version of the product to update
return(true);
}
catch (ThreadAbortException)
{
}
catch (WebException ex)
{
Debug.WriteLine(ex.Message, MY_TRACE_CATEGORY);
}
return(false);
}
/// <summary>
/// Initializes a new instance of the AutoUpdateManagerWithDownloadDescriptorEventArgs class.
/// </summary>
/// <param name="manager">The AutoUpdateManager that is handling the update.</param>
/// <param name="progressViewer">The IProgressViewer that can be used to display progress about the update.</param>
/// <param name="downloadDescriptor">The AutoUpdateDownloadDescriptor that describes teh update available.</param>
public AutoUpdateManagerWithDownloadDescriptorEventArgs(AutoUpdateManager manager, IProgressViewer progressViewer, AutoUpdateDownloadDescriptor downloadDescriptor)
: base(manager, progressViewer)
{
_downloadDescriptor = downloadDescriptor;
}
/// <summary>
/// Initializes a new instance of the AutoUpdateManagerWithDownloadDescriptorCancelEventArgs class.
/// </summary>
/// <param name="manager">The AutoUpdateManager that is handling the update.</param>
/// <param name="progressViewer">The IProgressViewer that can be used to display progress about the update.</param>
/// <param name="downloadDescriptor">The AutoUpdateDownloadDescriptor that describes teh update available.</param>
/// <param name="cancel">A flag that indicates whether the event should be cancelled or not.</param>
public AutoUpdateManagerWithDownloadDescriptorCancelEventArgs(AutoUpdateManager manager, IProgressViewer progressViewer, AutoUpdateDownloadDescriptor downloadDescriptor, bool cancel)
: base(manager, progressViewer, downloadDescriptor)
{
_cancel = cancel;
}
