插件化编程实现的一份糖炒栗子~~

迷茫的原因是因为想得太多，做得太少。因为只是想真的很容易，转瞬之间就会产生无数个念头，或许是该做点什么了吧。

但是整个人都是懒的，是废的，是大脑控制不住自己的行为的。解决方案唯有一步一步的去把行为变成习惯。

坚持一件事挺不容易的，不论结果的好坏，过程中总有收获的，坚持，不会是一件坏事。

胡言乱语结束~~~

下面是记录分享的一点东西~~请笑纳

0.结构一览

1.定义插件接口

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace YimoCore{  public interface IPlugin  {    /// <summary>    /// Gets or sets the plugin descriptor    /// </summary>    PluginDescriptor PluginDescriptor { get; set; }    /// <summary>    /// Install plugin    /// </summary>    void Install();    /// <summary>    /// Uninstall plugin    /// </summary>    void Uninstall();  }}

定义插件

2.添加插件信息类

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Reflection;using System.Text;using System.Threading.Tasks;namespace YimoCore{  /// <summary>  /// 插件信息  /// </summary>  public sealed class PluginDescriptor  {    /// <summary>    /// 插件主目录    /// </summary>    public string PluginFileName { get; set; }    /// <summary>    /// 插件类型    /// </summary>    public Type PluginType { get; set; }    /// <summary>    /// 插件主程序集    /// </summary>    public Assembly ReferencedAssembly { get; internal set; }    /// <summary>    /// 原始程序集文件    /// </summary>    public FileInfo OriginalAssemblyFile { get; internal set; }    /// <summary>    /// 插件包目录    /// </summary>    public FileInfo PluginConfigFile { get; internal set; }    /// <summary>    /// 类别    /// </summary>    public string Group { get; set; }    /// <summary>    /// 插件名称    /// </summary>    public string FriendlyName { get; set; }    /// <summary>    /// 程序集名称    /// </summary>    public string SystemName { get; set; }    /// <summary>    /// 描述    /// </summary>    public string Description { get; set; }    /// <summary>    /// 版本号    /// </summary>    public string Version { get; set; }    /// <summary>    /// 支持版本    /// </summary>    public IList<string> SupportedVersions { get; set; }    /// <summary>    /// 作者    /// </summary>    public string Author { get; set; }    /// <summary>    /// 排序    /// </summary>    public int DisplayOrder { get; set; }    /// <summary>    /// 获取插件实例    /// </summary>    /// <typeparam name="T"></typeparam>    /// <returns></returns>    public T Instance<T>() where T : class, IPlugin    {      var instance = Activator.CreateInstance(PluginType) as T;      if (instance != null)        instance.PluginDescriptor = this;      return instance;    }    public IPlugin Instance()    {      return Instance<IPlugin>();    }    public int CompareTo(PluginDescriptor other)    {      if (DisplayOrder != other.DisplayOrder)        return DisplayOrder.CompareTo(other.DisplayOrder);      else        return System.String.Compare(FriendlyName, other.FriendlyName, System.StringComparison.Ordinal);    }    public override string ToString()    {      return FriendlyName;    }    public override bool Equals(object obj)    {      var other = obj as PluginDescriptor;      return other != null &&        SystemName != null &&        SystemName.Equals(other.SystemName);    }    public override int GetHashCode()    {      return SystemName.GetHashCode();    }  }}

插件信息类

3.插件读取

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Reflection;using System.Text;using System.Threading.Tasks;using System.Web;namespace YimoCore{  public class PluginManager  {    private const string PluginsPath = "/modules"; //插件目录    private const string ShadowCopyPath = "/modules/bin"; //插件影子目录    public static IEnumerable<PluginDescriptor> ReferencedPlugins { get; set; }    public static void Init()    {      var appdir = AppDomain.CurrentDomain.BaseDirectory.Substring(0, AppDomain.CurrentDomain.BaseDirectory.LastIndexOf("\\"));      appdir = appdir.Substring(0, appdir.LastIndexOf("\\"));      appdir = appdir.Substring(0, appdir.LastIndexOf("\\"));      //插件目录      var pluginFolder = new DirectoryInfo(appdir + PluginsPath);      //插件bin目录      var shadowFolder = new DirectoryInfo(appdir + ShadowCopyPath);      var referencedPlugins = new List<PluginDescriptor>();      try      {        pluginFolder.Create();        shadowFolder.Create();        //清空bin目录        foreach (var fileInfo in shadowFolder.GetFiles())        {          fileInfo.Delete();        }        var pluginConfigFiles = pluginFolder.GetFiles("about.", SearchOption.AllDirectories);        foreach (var pluginConfigFile in pluginConfigFiles)        {          //获取插件信息          var pluginDescriptor = PluginFileParser.ParsePluginDescriptionFile(pluginConfigFile.FullName);          try          {            if (pluginConfigFile.Directory == null)              continue;            //获取插件所有的dll            var pluginFiles = pluginConfigFile.Directory.GetFiles("*.dll", SearchOption.AllDirectories);            var mainPluginFile = pluginFiles.FirstOrDefault(              item =>              item.Name.Equals(pluginDescriptor.PluginFileName,              StringComparison.InvariantCultureIgnoreCase));            pluginDescriptor.PluginConfigFile = pluginConfigFile;            pluginDescriptor.OriginalAssemblyFile = mainPluginFile;            pluginDescriptor.ReferencedAssembly = DeployDllFile(mainPluginFile, shadowFolder);            foreach (var t in pluginDescriptor.ReferencedAssembly.GetTypes())            {              if (typeof(IPlugin).IsAssignableFrom(t))              {                if (t.IsInterface == false && t.IsClass && !t.IsAbstract)                {                  pluginDescriptor.PluginType = t;                  break;                }              }            }            referencedPlugins.Add(pluginDescriptor);          }          catch (ReflectionTypeLoadException ex)          {            throw;          }        }      }      catch (ReflectionTypeLoadException ex)      {      }      ReferencedPlugins = referencedPlugins;    }    /// <summary>    /// 部署程序集    /// </summary>    /// <param name="dllFile">插件程序集文件</param>    /// <param name="shadowFolder">/Plugins/bin目录</param>    private static Assembly DeployDllFile(FileInfo dllFile, DirectoryInfo shadowFolder)    {      DirectoryInfo copyFolder;      //根据当前的信任级别设置复制目录      copyFolder = shadowFolder;      var newDllFile = new FileInfo(copyFolder.FullName + "\\" + dllFile.Name);      try      {        File.Copy(dllFile.FullName, newDllFile.FullName, true);      }      catch (Exception ex1)//在某些情况下会出现"正由另一进程使用，因此该进程无法访问该文件"错误，所以先重命名再复制      {        try        {          File.Move(newDllFile.FullName, newDllFile.FullName + Guid.NewGuid().ToString("N") + ".locked");        }        catch (Exception ex2)        {          throw ex2;        }        File.Copy(dllFile.FullName, newDllFile.FullName, true);      }      var assembly = Assembly.LoadFrom(newDllFile.FullName);      //将程序集添加到当前应用程序域      //BuildManager.AddReferencedAssembly(assembly);      return assembly;    }  }}

插件读取

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.namespace YimoCore{  /// <summary>  /// Plugin files parser  /// </summary>  public static class PluginFileParser  {    public static IList<string> ParseInstalledPluginsFile(string filePath)    {      if (!File.Exists(filePath))        return new List<string>();      var text = File.ReadAllText(filePath);      if (String.IsNullOrEmpty(text))        return new List<string>();      var lines = new List<string>();      using (var reader = new StringReader(text))      {        string str;        while ((str = reader.ReadLine()) != null)        {          if (String.IsNullOrWhiteSpace(str))            continue;          lines.Add(str.Trim());        }      }      return lines;    }    public static void SaveInstalledPluginsFile(IList<String> pluginSystemNames, string filePath)    {      if (pluginSystemNames == null || pluginSystemNames.Count == 0)        return;      string result = "";      foreach (var sn in pluginSystemNames)        result += string.Format("{0}{1}", sn, Environment.NewLine);      File.WriteAllText(filePath, result);    }    public static PluginDescriptor ParsePluginDescriptionFile(string filePath)    {      XDocument doc;      try      {        doc = XDocument.Load(filePath);      }      catch (Exception)      {        return null;      }      var pluginEle = doc.Element("plugin");      if (pluginEle == null)        return null;      var descriptor = new PluginDescriptor();      var ele = pluginEle.Element("SystemName");      if (ele != null)        descriptor.SystemName = ele.Value;      ele = pluginEle.Element("Group");      if (ele != null)        descriptor.Group = ele.Value;      ele = pluginEle.Element("FriendlyName");      if (ele != null)        descriptor.FriendlyName = ele.Value;      ele = pluginEle.Element("Description");      if (ele != null)        descriptor.Description = ele.Value;      ele = pluginEle.Element("Version");      if (ele != null)        descriptor.Version = ele.Value;      ele = pluginEle.Element("SupportedVersions");      if (ele != null)      {        //parse supported versions        descriptor.SupportedVersions = ele.Value.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)          .Select(x => x.Trim())          .ToList();      }      ele = pluginEle.Element("Author");      if (ele != null)        descriptor.Author = ele.Value;      ele = pluginEle.Element("DisplayOrder");      if (ele != null)      {        int displayOrder;        int.TryParse(ele.Value, out displayOrder);        descriptor.DisplayOrder = displayOrder;      }      ele = pluginEle.Element("FileName");      if (ele != null)        descriptor.PluginFileName = ele.Value;      if (descriptor.SupportedVersions.Count == 0)        descriptor.SupportedVersions.Add("2.00");      return descriptor;    }    public static void SavePluginDescriptionFile(PluginDescriptor plugin)    {      if (plugin == null)        throw new ArgumentException("plugin");      if (plugin.PluginConfigFile == null)        throw new Exception(string.Format("没有加载插件 {0} 的配置文件", plugin.SystemName));      var doc = new XDocument(         new XDeclaration("1.0", "utf-8", "yes"),         new XElement("Group", plugin.Group),         new XElement("FriendlyName", plugin.FriendlyName),         new XElement("SystemName", plugin.SystemName),         new XElement("Description", plugin.Description),         new XElement("Version", plugin.Version),         new XElement("SupportedVersions", string.Join(",", plugin.SupportedVersions)),         new XElement("Author", plugin.Author),         new XElement("DisplayOrder", plugin.DisplayOrder),         new XElement("FileName", plugin.PluginFileName)       );      doc.Save(plugin.PluginConfigFile.FullName);    }  }}

加载插件-PluginFileParser

4.使用

　　4.0新建插件接口并继承IPlugin

　　4.1：为插件类库添加about.

<??><plugin> <Group>Sign</Group> <FriendlyName>素材网</FriendlyName> <SystemName>素材网</SystemName> <Description>素材网签到</Description> <Version>1.0</Version> <SupportedVersions>1.0</SupportedVersions> <Author>YiMo</Author> <DisplayOrder>1</DisplayOrder> <FileName>素材网.dll</FileName></plugin>

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