/// <summary>
/// Loads all plug-ins contained in all assemblies that are found in the path specified
/// </summary>
/// <param name="path">The path of the plug-ins directory</param>
/// <param name="activator">THe type activator (optional)</param>
/// <returns>A collection of matching plug-in instances</returns>
/// <exception cref="IOException"></exception>
/// <exception cref="UnauthorizedAccessException"></exception>
/// <exception cref="PathTooLongException"></exception>
/// <exception cref="DirectoryNotFoundException"></exception>
/// <exception cref="System.Security.SecurityException"></exception>
/// <exception cref="BadImageFormatException"></exception>
/// <exception cref="System.Reflection.AmbiguousMatchException"></exception>
/// <exception cref="System.Reflection.TargetInvocationException"></exception>
/// <exception cref="MethodAccessException"></exception>
/// <exception cref="MemberAccessException"></exception>
/// <exception cref="System.Runtime.InteropServices.InvalidComObjectException"></exception>
/// <exception cref="MissingMethodException"></exception>
/// <exception cref="System.Runtime.InteropServices.COMException"></exception>
/// <exception cref="TypeLoadException"></exception>
public IEnumerable <T> LoadPlugins(string path, ITypeActivator activator = null)
{
Validate.IsNotEmpty(path);
var assemblies = LoadAssemblies(path);
var pluginType = typeof(T);
var pluginTypes = new List <Type>();
// Build a collection of plug-in types from each assembly
foreach (var assembly in assemblies)
{
if (assembly != null)
{
var types = assembly.GetLoadableTypes();
foreach (var type in types)
{
if (type.IsInterface || type.IsAbstract)
{
continue;
}
else
{
if (type.GetInterface(pluginType.FullName) != null)
{
pluginTypes.Add(type);
}
}
}
}
}
var plugins = new List <T>(pluginTypes.Count);
// Build a collection of plug-in instances from the plug-in types
foreach (var type in pluginTypes)
{
T plugin;
if (activator != null)
{
plugin = (T)activator.GetInstance(type);
}
else
{
plugin = (T)Activator.CreateInstance(type);
}
plugins.Add(plugin);
}
return(plugins);
}