private static void LoadPlugins()
{
string strPluginPath = DatabaseConfiguration.DatabaseSettings.PluginLocation;
string strConfigPath = Path.GetDirectoryName(ApplicationConfiguration.AppConfig.FilePath);
string[] plugins = new string[] { };
Assembly thisAssembly = Assembly.GetCallingAssembly();
// Add default plugins from our Framework assembly
LoadedPlugin sql = new LoadedPlugin(thisAssembly.Location, typeof(SqlProviderPlugin));
LoadedPlugin odbc = new LoadedPlugin(thisAssembly.Location, typeof(OdbcProviderPlugin));
LoadedPlugin oledb = new LoadedPlugin(thisAssembly.Location, typeof(OleDbProviderPlugin));
_plugins.Add(sql.ProviderPlugin.ProviderType, sql);
_plugins.Add(odbc.ProviderPlugin.ProviderType, odbc);
_plugins.Add(oledb.ProviderPlugin.ProviderType, oledb);
// If the configuration file did not specify a plugin location use the default from the registry
if (string.IsNullOrEmpty(strPluginPath))
{
strPluginPath = DefaultPluginLocation;
}
// If the plugins do not exist where the config file was loaded, check the location of the executable
if (Directory.Exists(Path.Combine(strConfigPath, strPluginPath)) == true)
{
strPluginPath = Path.Combine(strConfigPath, strPluginPath);
}
else
{
strPluginPath = Path.Combine(Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath), strPluginPath);
}
try
{
plugins = Directory.GetFiles(strPluginPath, "*.dll");
}
catch { }
foreach (string plugin in plugins)
{
try
{
foreach (LoadedPlugin p in LoadPlugins(Assembly.LoadFile(plugin)))
{
_plugins.Add(p.ProviderPlugin.ProviderType, p);
}
}
catch (Exception exception)
{
Exception meaningfulException = exception;
while (null != meaningfulException.InnerException)
{
meaningfulException = meaningfulException.InnerException;
}
ApplicationLog.WriteError(string.Format("Unable to load plugin {0}", plugin), meaningfulException ?? exception);
}
}
}
private static List <LoadedPlugin> LoadPlugins(Assembly loadedAssembly)
{
List <LoadedPlugin> loadedPlugins = new List <LoadedPlugin>();
AssemblyName[] referencedAssemblies = loadedAssembly.GetReferencedAssemblies();
bool loadedAssemblyIsValid = false;
AssemblyName pluginInterfaceAssembly = Assembly.GetAssembly(typeof(IProviderPlugin)).GetName();
// Check the assembly references to make sure that we can load the plugin
// by checking the referenced version of this assembly
foreach (AssemblyName referencedAssembly in referencedAssemblies)
{
if (referencedAssembly.Name == pluginInterfaceAssembly.Name)
{
if (referencedAssembly.Version.Major == pluginInterfaceAssembly.Version.Major
&&
referencedAssembly.Version.Minor == pluginInterfaceAssembly.Version.Minor
&&
referencedAssembly.Version.Build == pluginInterfaceAssembly.Version.Build)
{
loadedAssemblyIsValid = true;
}
break;
}
else
if (loadedAssembly.FullName == pluginInterfaceAssembly.FullName)
{
loadedAssemblyIsValid = true;
break;
}
}
if (loadedAssemblyIsValid)
{
Type[] loadedAssemblyTypes = loadedAssembly.GetTypes();
Type pluginInterfaceType = typeof(IProviderPlugin);
foreach (Type possiblePluginType in loadedAssemblyTypes)
{
Type[] typeInterfaces = possiblePluginType.GetInterfaces();
foreach (Type typeInterface in typeInterfaces)
{
if (possiblePluginType.IsAbstract == false && pluginInterfaceType.FullName == typeInterface.FullName)
{
LoadedPlugin plugin = new LoadedPlugin(loadedAssembly.Location, possiblePluginType);
loadedPlugins.Add(plugin);
}
}
}
}
return(loadedPlugins);
}
