src/EasyFrameWork/Mvc/Plugin/AssemblyLoader.cs

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/* http://www.zkea.net/ 
 * Copyright (c) ZKEASOFT. All rights reserved. 
 * http://www.zkea.net/licenses */

using Microsoft.Extensions.DependencyModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Threading.Tasks;
using Easy.Extend;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Hosting;

namespace Easy.Mvc.Plugin
{
    public class AssemblyLoader
    {
        private static Dictionary<string, Assembly> LoadedAssemblies { get; set; }
        public AssemblyLoader(List<PluginInfo> plugins)
        {
            DependencyAssemblies = new List<Assembly>();
            PluginInfos = plugins ?? new List<PluginInfo>();
        }
        public string CurrentPath { get; set; }
        public string AssemblyPath { get; set; }
        public Assembly CurrentAssembly { get; private set; }
        public List<PluginInfo> PluginInfos { get; set; }
        public List<Assembly> DependencyAssemblies { get; private set; }
        private readonly TypeInfo PluginTypeInfo = typeof(IPluginStartup).GetTypeInfo();
        public IEnumerable<Assembly> LoadPlugin(string path)
        {
            if (CurrentAssembly == null)
            {
                AssemblyPath = path;
                CurrentAssembly = AssemblyLoadContext.Default.LoadFromAssemblyPath(path);
                ResolveDenpendency(CurrentAssembly);
                yield return CurrentAssembly;
                foreach (var item in DependencyAssemblies)
                {
                    yield return item;
                }
            }
            else { throw new Exception("A loader just can load one assembly."); }
        }

        private void ResolveDenpendency(Assembly assembly)
        {
            if (LoadedAssemblies == null)
            {
                LoadedAssemblies = AppDomain.CurrentDomain.GetAssemblies().ToDictionary(m => GetAssemblyNameVersion(m.GetName()));
            }
            string nameVersion = GetAssemblyNameVersion(assembly.GetName());
            if (!LoadedAssemblies.ContainsKey(nameVersion))
            {
                LoadedAssemblies.Add(nameVersion, assembly);