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。
申明：部分代码来源于网上,当然思路也是，呵呵
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
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
{
PluginInfoAttribute PluginInfo
{ get; set; }
bool IsLoad
{
get;
set;
}
Image ModulePicture
{
get;
}
Image ModulePictureEnter
{
get;
}
Image ModulePictureClick
{
get;
}
string ModuleName
{
get;
}
Dictionary<string, EventHandler> ChildNodes
{
get;
}
ILoadForm FormLoader
{
get;
set;
}
}
}
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 ArrayList piProperties = new ArrayList();
private static bool IsValidPlugin(Type t)
{
bool ret = false;
Type[] interfaces = t.GetInterfaces();
foreach( Type theInterface 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;
PluginInfoAttribute typeAttribute = new PluginInfoAttribute();
foreach (string file in files)
{
string ext = file.Substring(file.LastIndexOf("."));
if (ext != ".dll") continue;
try
{
Assembly tmp = Assembly.LoadFile(file);
Type[] types = tmp.GetTypes();
bool ok = false;
foreach (Type t in types)
if (IsValidPlugin(t))
{
Iplugin plugin = (Iplugin)tmp.CreateInstance(t.FullName);
plugins.Add(plugin);
object[] attbs = t.GetCustomAttributes(typeAttribute.GetType(), false);
PluginInfoAttribute attribute = 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("未定义插件属性");
if (ok) break;
}
}
catch (Exception err)
{
throw err;
}
}
plugins.Sort((p1, p2) => {
return p2.PluginInfo.Index - p1.PluginInfo.Index;
});
}
}
}
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 LeftNav frmLeftNav = new LeftNav();
public static ILoadForm Formloader ;
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 Image ModulePicture
{
get
{
return ((System.Drawing.Image)(ImageResource.Index));
}
}
public Image ModulePictureEnter
{
get
{
return ((System.Drawing.Image)(ImageResource.IndexEnter));
}
}
public Image ModulePictureClick
{
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 ILoadForm FormLoader
{
get
{
return Formloader;
}
set
{
Formloader = value;
}
}
public PluginInfoAttribute PluginInfo
{
get;
set;
}
}
}此图现在有两个插件
运行效果如下