C#实现插件式开发的一个Demo分享

做winform程序，很多时候都需要用到插件式的，所以本人做了一个Demo，思路跟网上思路基本一致，现在共享出来如有需要的朋友可以下载。

原理很简单：

一：定义插件接口

二：实现插件接口并建立不同工项目，使其在生成时生成不同的DLL

三：主程序运行时根据接口名利用反射对插件目录的DLL进行加载，加载完成后便可以使用插件接口定义的方法或属性了。

下面上几张图，有兴趣的朋友可以先看看，觉得值得一看的朋友可以下载。

项目结构：

DefaultPlugin,PosPlugin两个项目均为插件，均实现了Iplugin接可

Iplugin接口

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace WinDemo.Core
{
public interface Iplugin
{

PluginInfoAttributePluginInfo
{ get ; set ;}
bool IsLoad
{
get ;
set ;
}

ImageModulePicture
{
get ;
}

ImageModulePictureEnter
{
get ;
}

ImageModulePictureClick
{
get ;
}

string ModuleName
{
get ;
}


Dictionary < string ,EventHandler > ChildNodes
{
get ;
}

ILoadFormFormLoader
{
get ;
set ;
}


}
}

用于加载插件的类 PluginLoader

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.IO;
using System.Windows.Forms;
using System.Collections;

namespace WinDemo.Core
{
public static class PluginLoader
{

public static List < Iplugin > plugins = new List < Iplugin > ();
private static ArrayListpiProperties = new ArrayList();

private static bool IsValidPlugin(Typet)
{
bool ret = false ;
Type[]interfaces = t.GetInterfaces();
foreach (TypetheInterface in interfaces){
if (theInterface.FullName == " WinDemo.Core.Iplugin " )
{
ret = true ;
break ;
}
}
return ret;
}




public static void LoadAllPlugins()
{
string []files = Directory.GetFiles(Application.StartupPath + " //plugin// " );
int i = 0 ;
PluginInfoAttributetypeAttribute = new PluginInfoAttribute();
foreach ( string file in files)
{
string ext = file.Substring(file.LastIndexOf( " . " ));
if (ext != " .dll " ) continue ;
try
{
Assemblytmp = Assembly.LoadFile(file);
Type[]types = tmp.GetTypes();
bool ok = false ;
foreach (Typet in types)
if (IsValidPlugin(t))
{
Ipluginplugin = (Iplugin)tmp.CreateInstance(t.FullName);
plugins.Add(plugin);
object []attbs = t.GetCustomAttributes(typeAttribute.GetType(), false );
PluginInfoAttributeattribute = null ;
foreach ( object attb in attbs)
{
if (attb is PluginInfoAttribute)
{
attribute = (PluginInfoAttribute)attb;
attribute.Index = i;
i ++ ;
ok = true ;
break ;
}
}

if (attribute != null )
{
piProperties.Add(attribute);
plugin.PluginInfo = attribute;
}
else throw new Exception( " 为定义插件属性 " );
if (ok) break ;
}
}
catch (Exceptionerr)
{
throw err;
}
}
plugins.Sort((p1,p2) => {
return p2.PluginInfo.Index - p1.PluginInfo.Index;
});
}
}
}

Iplugin的实现类PosPlugin类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using WinDemo.Core;
using System.Windows.Forms;


namespace DefaultPlugin
{
[PluginInfo( " Default " , " 1.0 " , " XH " , " www.cnporter.com " , true , 2 )]
public class Default:WinDemo.Core.Iplugin
{
private Dictionary < string ,EventHandler > _ChildNodes = new Dictionary < string ,EventHandler > ();
private LeftNavfrmLeftNav = new LeftNav();
public static ILoadFormFormloader;
public Default()
{

_ChildNodes.Add( " 菜单五 " ,(sender,e) =>
{
MessageBox.Show(sender.ToString());
});
_ChildNodes.Add( " 菜单四 " ,(sender,e) =>
{
MessageBox.Show(sender.ToString());
});
_ChildNodes.Add( " 菜单三 " ,(sender,e) =>
{
MessageBox.Show(sender.ToString());
});
_ChildNodes.Add( " 菜单二 " ,(sender,e) =>
{
MessageBox.Show(sender.ToString());
});
_ChildNodes.Add( " 菜单一 " ,(sender,e) =>
{
FormLoader.LoadNavFrm(frmLeftNav);
});
}



public ImageModulePicture
{
get
{
return ((System.Drawing.Image)(ImageResource.Index));
}
}

public ImageModulePictureEnter
{
get
{
return ((System.Drawing.Image)(ImageResource.IndexEnter));
}
}

public ImageModulePictureClick
{
get
{
return ((System.Drawing.Image)(ImageResource.IndexClick));
}
}

public string ModuleName
{
get
{
return " 首页 " ;
}
}

public Dictionary < string ,EventHandler > ChildNodes
{
get
{
return _ChildNodes;
}
}




public bool IsLoad
{
get ;
set ;
}

public ILoadFormFormLoader
{
get
{
return Formloader;
}
set
{
Formloader = value;
}
}



public PluginInfoAttributePluginInfo
{
get ;
set ;
}
}


}

此图现在有两个插件

运行效果如下

源码下载