/// <summary>
/// Installs an assembly resolver, which will load *any* assembly which exists recursively within the supplied folder.
/// </summary>
/// <param name="RootDirectory">The directory to enumerate.</param>
public static void InstallRecursiveAssemblyResolver(string RootDirectory)
{
RefreshAssemblyCache(RootDirectory);
AppDomain.CurrentDomain.AssemblyResolve += (sender, args) =>
{
// Name is fully qualified assembly definition - e.g. "p4dn, Version=1.0.0.0, Culture=neutral, PublicKeyToken=ff968dc1933aba6f"
string AssemblyName = args.Name.Split(',')[0];
string AssemblyLocation;
if (AssemblyLocationCache.TryGetValue(AssemblyName, out AssemblyLocation))
{
// We have this assembly in our folder.
if (File.Exists(AssemblyLocation))
{
// The assembly still exists, so load it.
return(Assembly.LoadFile(AssemblyLocation));
}
else
{
// The assembly no longer exists on disk, so remove it from our cache.
AssemblyLocationCache.Remove(AssemblyName);
}
}
// The assembly wasn't found, though may have been compiled or copied as a dependency
RefreshAssemblyCache(RootDirectory, string.Format("{0}.dll", AssemblyName));
if (AssemblyLocationCache.TryGetValue(AssemblyName, out AssemblyLocation))
{
return(Assembly.LoadFile(AssemblyLocation));
}
return(null);
};
}
private static void RefreshAssemblyCache(string RootDirectory, string Pattern = "*.dll")
{
// Initialize our cache of assemblies by enumerating all files in the given folder.
foreach (string DiscoveredAssembly in Directory.EnumerateFiles(RootDirectory, Pattern, SearchOption.AllDirectories))
{
string AssemblyName = Path.GetFileNameWithoutExtension(DiscoveredAssembly);
DateTime AssemblyLastWriteTime = File.GetLastWriteTimeUtc(DiscoveredAssembly);
if (AssemblyLocationCache.ContainsKey(AssemblyName))
{
// We already have this assembly in our cache. Only replace it if the discovered file is newer (to avoid stale assemblies breaking stuff).
if (AssemblyLastWriteTime > AssemblyWriteTimes[AssemblyName])
{
AssemblyLocationCache[AssemblyName] = DiscoveredAssembly;
AssemblyWriteTimes[AssemblyName] = AssemblyLastWriteTime;
}
}
else
{
// This is the first copy of this assembly ... add it to our cache.
AssemblyLocationCache.Add(AssemblyName, DiscoveredAssembly);
AssemblyWriteTimes.Add(AssemblyName, AssemblyLastWriteTime);
}
}
}