public Plugin GetPlugin(int resourceId)
{
HttpWebResponse error;
string response = DownloadString(string.Format(PluginUrl, resourceId), out error);
if (error?.StatusCode == HttpStatusCode.Forbidden)
{
return(null); // Plugin not found or not allowed access.
}
var htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(response);
var rootNode = htmlDoc.DocumentNode;
var result = new Plugin();
var resourceDesc = rootNode.SelectSingleNode("//*[@class='mainContent']/div[@class='resourceInfo']/div[@class='resourceDesc']");
result.Name = ParsePluginName(resourceDesc);
result.Game = ParsePluginGame(resourceDesc);
result.Description = resourceDesc.SelectSingleNode("p").InnerText;
var historyTable = rootNode.SelectSingleNode("//*[@class='dataTable resourceHistory']");
foreach (var rowNode in historyTable.SelectNodes("tr").Skip(1)) // Skip header
{
Plugin.Version item = ParsePluginRow(rowNode);
result.Versions.Add(item);
}
return(result);
}
static void ExecuteAndUnload(string assemblyPath, out WeakReference alcWeakRef)
{
// Create the unloadable HostAssemblyLoadContext
var alc = new HostAssemblyLoadContext(assemblyPath);
// Create a weak reference to the AssemblyLoadContext that will allow us to detect
// when the unload completes.
alcWeakRef = new WeakReference(alc);
// Load the plugin assembly into the HostAssemblyLoadContext.
// NOTE: the assemblyPath must be an absolute path.
Assembly a = alc.LoadFromAssemblyPath(assemblyPath);
// Get the plugin interface by calling the PluginClass.GetInterface method via reflection.
Type pluginType = a.GetType("Plugin.PluginClass");
MethodInfo getInterface = pluginType.GetMethod("GetInterface", BindingFlags.Static | BindingFlags.Public);
Plugin.Interface plugin = (Plugin.Interface)getInterface.Invoke(null, null);
// Now we can call methods of the plugin using the interface
string result = plugin.GetMessage();
Plugin.Version version = plugin.GetVersion();
Console.WriteLine($"Response from the plugin: GetVersion(): {version}, GetMessage(): {result}");
// This initiates the unload of the HostAssemblyLoadContext. The actual unloading doesn't happen
// right away, GC has to kick in later to collect all the stuff.
alc.Unload();
}
private static Plugin.Version ParsePluginRow(HtmlNode rowNode)
{
Plugin.Version result = new Plugin.Version();
result.Value = rowNode.SelectSingleNode("td[1]").InnerText;
HtmlNode dateTimeNode = rowNode.SelectSingleNode("td[2]/*[@class='DateTime']");
string dateString = dateTimeNode.GetAttributeValue("title", dateTimeNode.InnerText);
result.ReleaseDate = DateTime.ParseExact(dateString, "MMM d', 'yyyy' at 'h:mm' 'tt", CultureInfo.InvariantCulture).ToUniversalTime();
string downloadsString = rowNode.SelectSingleNode("td[3]").InnerText;
result.Downloads = int.Parse(downloadsString, NumberStyles.AllowThousands, CultureInfo.InvariantCulture);
string downloadHref = rowNode.SelectSingleNode("td[4]/a").GetAttributeValue("href", null);
string versionStr = HttpUtility.ParseQueryString(downloadHref.Split('?')[1])["version"];
result.Id = int.Parse(versionStr);
return(result);
}
