public Component LoadComponent(string filePath)
{
FileInfo file = new FileInfo(filePath);
// Preliminary check
// must exist
if (!file.Exists)
{
throw new PluginException(string.Format("File {0} does not exist. Cannot load Component.", filePath));
}
// must be a dll file
if (!file.Extension.Equals(".dll"))
{
throw new PluginException(string.Format("File {0} is not a dll file. Cannot load Component.", filePath));
}
//Create a new assembly from the plugin file we're adding..
Assembly pluginAssembly = Assembly.LoadFrom(filePath);
Component component = null;
//Next we'll loop through all the Types found in the assembly
foreach (Type pluginType in pluginAssembly.GetTypes())
{
if (pluginType.IsPublic) //Only look at public types
{
if (!pluginType.IsAbstract) //Only look at non-abstract types
{
//Gets a type object of the interface we need the plugins to match
Type typeInterface = pluginType.GetInterface("Pic.Plugin.IPlugin", true);
//Make sure the interface we want to use actually exists
if (typeInterface != null)
{
//Create a new available plugin since the type implements the IPlugin interface
IPlugin plugin = (IPlugin)Activator.CreateInstance(pluginAssembly.GetType(pluginType.ToString()));
if (null != plugin)
{
component = new Component(plugin);
//Set the Plugin's host to this class which inherited IPluginHost
plugin.Host = this;
//Call the initialization sub of the plugin
plugin.Initialize();
//cleanup a bit
plugin = null;
}
}
typeInterface = null; //Mr. Clean
}
}
}
pluginAssembly = null; //more cleanup
// check that a component was actually created
if (null == component)
{
throw new Pic.Plugin.PluginException(string.Format("Failed to load valid component from existing file {0}", filePath));
}
// insert component in cache for fast retrieval
ComponentLoader.InsertInCache(component);
return(component);
}
