首先这种情况出现在应用程序启动前的方法里面。
本想通过发射来实现一些功能。谁知道被这个坑了。
碰到这种问题。已经相当无语了。同时也不知道该如何解决。望有能之士帮忙解答
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using
System;
using
System.IO;
using
System.Linq;
using
System.Reflection;
using
System.Web;
using
System.Web.Compilation;
using
System.Web.Hosting;
using
Infrastructure;
[assembly: PreApplicationStartMethod(typeof(PreApplicationInit), "InitializePlugins")]
namespace
Infrastructure
{ public
class PreApplicationInit
{
static
PreApplicationInit()
{
var
pluginsPath = HostingEnvironment.MapPath("~/plugins");
var
pluginsTempPath = HostingEnvironment.MapPath("~/plugins/temp");
if
(pluginsPath == null
|| pluginsTempPath == null)
throw
new DirectoryNotFoundException("plugins");
PluginFolder = new
DirectoryInfo(pluginsPath);
TempPluginFolder = new
DirectoryInfo(pluginsTempPath);
}
/// <summary>
/// The source plugin folder from which to copy from
/// </summary>
/// <remarks>
/// This folder can contain sub folders to organize plugin types
/// </remarks>
private
static readonly DirectoryInfo PluginFolder;
/// <summary>
/// The folder to copy the plugin DLLs to use for running the app
/// </summary>
private
static readonly DirectoryInfo TempPluginFolder;
/// <summary>
/// Initialize method that registers all plugins
/// </summary>
public
static void InitializePlugins()
{
var
assemblies = PluginFolder.GetFiles("*.dll", SearchOption.AllDirectories)
.Select(x => Assembly.LoadFrom(x.FullName));
foreach
(var
assembly in
assemblies)
{
var
type = assembly.GetTypes().FirstOrDefault(t => t.GetInterface(typeof(IModule).Name) != null);
if
(type == null) continue;
//Add the plugin as a reference to the application
if
(AppDomain.CurrentDomain.GetAssemblies().All(a => a.FullName != assembly.FullName))
{
BuildManager.AddReferencedAssembly(assembly);
}
//Add the modules to the PluginManager to manage them later
var
module = (IModule)Activator.CreateInstance(type);
PluginManager.Current.Modules.Add(module, assembly);
}
}
}
} |
上面是代码。
如果通过Type.IsAssignableFrom方法来查找接口的实现，根本查不到。
这是目录结构
这是Module的实现
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using
System;
using
Infrastructure;
namespace
NewsPlugin
{ public
class Module:IModule
{
public
string Name {
get
{
return
"NewsPlugin";
}
set
{
if
(value == null) throw
new ArgumentNullException("value");
this.Name = value;
}
}
}
} |