/// <summary>
/// Return a list of found local Assemblies excluding the known assemblies we don't want to scan
/// and excluding the ones passed in and excluding the exclusion list filter, the results of this are
/// cached for performance reasons.
/// </summary>
/// <param name="excludeFromResults">
/// An <see cref="IEnumerable{Assembly}"/> to exclude.
/// </param>
/// <returns>The collection of local assemblies.</returns>
internal static HashSet <Assembly> GetAssembliesWithKnownExclusions(
IEnumerable <Assembly> excludeFromResults = null)
{
using (var locker = new UpgradeableReadLock(LocalFilteredAssemblyCacheLocker))
{
if (LocalFilteredAssemblyCache.Any())
{
return(LocalFilteredAssemblyCache);
}
locker.UpgradeToWriteLock();
var assemblies = GetFilteredAssemblies(excludeFromResults, KnownAssemblyExclusionFilter);
foreach (var assembly in assemblies)
{
LocalFilteredAssemblyCache.Add(assembly);
}
return(LocalFilteredAssemblyCache);
}
}
/// <summary>
/// Lazily loads a reference to all assemblies and only local assemblies.
/// This is a modified version of:
/// <see href="http://www.dominicpettifer.co.uk/Blog/44/how-to-get-a-reference-to-all-assemblies-in-the--bin-folder"/>
/// </summary>
/// <remarks>
/// We do this because we cannot use AppDomain.Current.GetAssemblies() as this will return only assemblies that have been
/// loaded in the CLR, not all assemblies.
/// See these threads:
/// <see href="http://issues.umbraco.org/issue/U5-198"/>
/// <see href="http://stackoverflow.com/questions/3552223/asp-net-appdomain-currentdomain-getassemblies-assemblies-missing-after-app"/>
/// <see href="http://stackoverflow.com/questions/2477787/difference-between-appdomain-getassemblies-and-buildmanager-getreferencedassembl"/>
/// </remarks>
/// <returns>
/// The <see cref="HashSet{Assembly}"/>.
/// </returns>
internal static HashSet <Assembly> GetAllAssemblies()
{
using (var locker = new UpgradeableReadLock(Locker))
{
if (_allAssemblies == null)
{
locker.UpgradeToWriteLock();
try
{
// NOTE: we cannot use AppDomain.CurrentDomain.GetAssemblies() because this only returns assemblies that have
// already been loaded in to the app domain, instead we will look directly into the bin folder and load each one.
var binFolder = IOHelper.GetRootDirectoryBinFolder();
var binAssemblyFiles = Directory.GetFiles(binFolder, "*.dll", SearchOption.TopDirectoryOnly).ToList();
var assemblies = new HashSet <Assembly>();
foreach (var file in binAssemblyFiles)
{
try
{
var assemblyName = AssemblyName.GetAssemblyName(file);
assemblies.Add(Assembly.Load(assemblyName));
}
catch (Exception ex)
{
if (ex is SecurityException || ex is BadImageFormatException || ex is IOException)
{
// Swallow exception but allow debugging.
Debug.WriteLine(ex.Message);
}
else
{
throw;
}
}
}
// If for some reason they are still no assemblies, then use the AppDomain to load in already loaded assemblies.
if (!assemblies.Any())
{
foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
{
assemblies.Add(assembly);
}
}
// Here we are trying to get the App_Code assembly
string[] fileExtensions = { ".cs", ".vb" };
var appCodeFolder = new DirectoryInfo(IOHelper.MapPath("~/App_code"));
// Check if the folder exists and if there are any files in it with the supported file extensions
if (appCodeFolder.Exists && fileExtensions.Any(x => appCodeFolder.GetFiles("*" + x).Any()))
{
var appCodeAssembly = Assembly.Load("App_Code");
if (!assemblies.Contains(appCodeAssembly))
{
assemblies.Add(appCodeAssembly);
}
}
// Now set the allAssemblies
_allAssemblies = new HashSet <Assembly>(assemblies);
}
catch (InvalidOperationException e)
{
if (!(e.InnerException is SecurityException))
{
throw;
}
_binFolderAssemblies = _allAssemblies;
}
}
return(_allAssemblies);
}
}