/// <summary>
/// Verifies the specified URL.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="title">The title.</param>
/// <param name="question">The question.</param>
public static void Verify(string url, string title, string question, bool infoIfVersionUpdated)
{
// get the running version of executable
Version curVersion = System.Reflection.Assembly.GetEntryAssembly().GetName().Version;
NewVersion newVersion = GetLastPublishedVersion(url);
if (newVersion == null)
{
return;
}
// compare the versions
if (curVersion.CompareTo(newVersion.AvaiableVersion) < 0)
{
// ask the user if he would like
// to download the new version
if (DialogResult.Yes ==
MessageBox.Show("Current version " + curVersion + "\n\n" + question + "\n\nNew version " + newVersion.AvaiableVersion + "\nDate " + newVersion.Since, title,
MessageBoxButtons.YesNo,
MessageBoxIcon.Question))
{
// navigate the default web
// browser to our app
// homepage (the url
// comes from the xml content)
System.Diagnostics.Process.Start(newVersion.Url);
}
}
else
{
if (infoIfVersionUpdated)
{
MessageBox.Show("The software is updated!", "Updated",
MessageBoxButtons.OK,
MessageBoxIcon.Information);
}
}
}
/// <summary>
/// Gets the last published version.
/// </summary>
/// <param name="url">The URL.</param>
/// <returns></returns>
internal static NewVersion GetLastPublishedVersion(string url)
{
// in newVersion variable we will store the
// version info from xml file
NewVersion newVersion = null;
// and in this variable we will put the url we
// would like to open so that the user can
// download the new version
// it can be a homepage or a direct
// link to zip/exe file
url = (url == null) ? "" : url;
if (url.Trim().Length == 0)
{
return(newVersion);
}
string date;
try
{
// provide the XmlTextReader with the URL of
// our xml document
string xmlURL = url;
XmlTextReader reader =
new XmlTextReader(xmlURL);
// simply (and easily) skip the junk at the beginning
reader.MoveToContent();
// internal - as the XmlTextReader moves only
// forward, we save current xml element name
// in elementName variable. When we parse a
// text node, we refer to elementName to check
// what was the node name
string elementName = "";
// we check if the xml starts with a proper
// "ourfancyapp" element node
if ((reader.NodeType == XmlNodeType.Element) &&
(reader.Name == "application"))
{
while (reader.Read())
{
// when we find an element node,
// we remember its name
if (reader.NodeType == XmlNodeType.Element)
{
elementName = reader.Name;
}
else
{
// for text nodes...
if ((reader.NodeType == XmlNodeType.Text) &&
(reader.HasValue))
{
// we check what the name of the node was
switch (elementName)
{
case "version":
// thats why we keep the version info
// in xxx.xxx.xxx.xxx format
// the Version class does the
// parsing for us
newVersion = new NewVersion();
newVersion.AvaiableVersion = new Version(reader.Value + ".0");
break;
case "url":
url = reader.Value;
newVersion.Url = url;
break;
case "date":
date = reader.Value;
newVersion.Since = date;
break;
default:
break;
}
}
}
}
}
reader.Close();
}
catch (Exception)
{
}
return(newVersion);
}
