/// <summary>
/// 获取指定 pluginId 的启用插件
/// </summary>
/// <param name="pluginId"></param>
/// <returns>1.插件未启用返回null, 2.找不到此插件上下文返回null 3.找不到插件主dll返回null 4.插件主dll中找不到实现了IPlugin的Type返回null, 5.无法实例化插件返回null</returns>
public IPlugin Plugin(string pluginId)
{
// 1.所有启用的插件 PluginId
var pluginConfigModel = PluginConfigModelFactory.Create();
IList <string> enablePluginIds = pluginConfigModel.EnabledPlugins;
// 插件未启用返回null
if (!enablePluginIds.Contains(pluginId))
{
return(null);
}
// 找不到此插件上下文返回null
if (!PluginsLoadContexts.Any(pluginId))
{
return(null);
}
// 2.找到插件对应的Context
var context = PluginsLoadContexts.Get(pluginId);
// 3.找插件 主 Assembly
// Assembly.FullName: HelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
Assembly pluginMainAssembly = context.Assemblies.Where(m => m.FullName.StartsWith($"{pluginId}, Version=")).FirstOrDefault();
// 找不到插件主dll返回null
if (pluginMainAssembly == null)
{
return(null);
}
// 4.从插件主Assembly中 找实现了 TPlugin 接口的 Type, 若有多个，只要一个
Type pluginType = pluginMainAssembly.ExportedTypes.Where(m =>
(m.BaseType == typeof(IPlugin) || m.GetInterfaces().Contains(typeof(IPlugin)))
&&
!m.IsInterface
&&
!m.IsAbstract
).FirstOrDefault();
// 插件主dll中找不到实现了IPlugin的Type返回null
if (pluginType == null)
{
return(null);
}
// 5.实例化插件 Type
//(TPlugin)Activator.CreateInstance(pluginType,);
//try to resolve plugin as unregistered service
//object instance = EngineContext.Current.ResolveUnregistered(pluginType);
object instance = ResolveUnregistered(pluginType);
//try to get typed instance
IPlugin typedInstance = (IPlugin)instance;
// 无法实例化插件返回null
if (typedInstance == null)
{
return(null);
}
return(typedInstance);
}
/// <summary>
/// 实现了指定接口或类型 的启用插件
/// </summary>
/// <typeparam name="TPlugin">可以是一个接口，一个抽象类，一个普通实现类, 只要实现了 <see cref="IPlugin"/>即可</typeparam>
/// <returns></returns>
public IEnumerable <TPlugin> EnablePlugins <TPlugin>()
where TPlugin : IPlugin // BasePlugin
{
// TODO: 目前这里还有问题, 不应该写为 BasePlugin, 不利于扩展, 不利于插件开发者自己实现 Install , Uninstall等
// 1.所有启用的插件 PluginId
var pluginConfigModel = PluginConfigModelFactory.Create();
IList <string> enablePluginIds = pluginConfigModel.EnabledPlugins;
foreach (var pluginId in enablePluginIds)
{
if (PluginsLoadContexts.Any(pluginId))
{
// 2.找到插件对应的Context
var context = PluginsLoadContexts.Get(pluginId);
// 3.找插件 主 Assembly
// Assembly.FullName: HelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
Assembly pluginMainAssembly = context.Assemblies.Where(m => m.FullName.StartsWith($"{pluginId}, Version=")).FirstOrDefault();
if (pluginMainAssembly == null)
{
continue;
}
// 4.从插件主Assembly中 找实现了 TPlugin 接口的 Type, 若有多个，只要一个
Type pluginType = pluginMainAssembly.ExportedTypes.Where(m =>
(m.BaseType == typeof(TPlugin) || m.GetInterfaces().Contains(typeof(TPlugin)))
&&
!m.IsInterface
&&
!m.IsAbstract
).FirstOrDefault();
if (pluginType == null)
{
continue;
}
// 5.实例化插件 Type
//(TPlugin)Activator.CreateInstance(pluginType,);
//try to resolve plugin as unregistered service
//object instance = EngineContext.Current.ResolveUnregistered(pluginType);
object instance = ResolveUnregistered(pluginType);
//try to get typed instance
TPlugin typedInstance = (TPlugin)instance;
if (typedInstance == null)
{
continue;
}
yield return(typedInstance);
}
}
}