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.Net平台下实例类型无法转换成接口类型？

2024-07-02 20:22:21   228人阅读

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 =http://www.mamicode.com/= null) throw new ArgumentNullException("value");
                this.Name = value;
            }
        }
    }
}

 

 


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