myblog设计说明之 Plug架构....(原创)
只写代码,说明稍后补上:
载入插件目录中用户上传的DLL
private static void LoadPlugs()//分析载入dll里的web控件缓存
{
string[] files = Directory.GetFiles(Globals.PlugsPath, "*.dll");
Cache cache = HttpRuntime.Cache;
Dictionary<string, Type> plugDict = new Dictionary<string, Type>();
foreach (string f in files) //查找所有dll文件
{
try
{
Assembly a = Assembly.LoadFrom(f);//载入
System.Type[] types = a.GetTypes();
foreach (System.Type type in types)
{
if (type.IsSubclassOf(typeof(WebControl)))//查找是否 WebControl
{
if (type.GetCustomAttributes(typeof(PlugDisplayNameAttribute), false).Length != 1) //应用的属性 throw new PlugException(PlugExceptionType.PlugDisplayNameNotFound, type);
else
{
PlugAttribute att=
(PlugAttribute)PlugAttribute.GetCustomAttribute(type,typeof(PlugAttribute));
plugDict.Add(att.Name, type); //增加到字典
}
}
}
cache.Insert("myblog_Plug", plugDict); //加入缓存
}
catch (PlugException e)
{
throw;
}
catch (Exception e)
{
throw ;
}
}
return;
}
载入Plug 返回控件引用:
public static Control LoadPlug(string className)
{
Dictionary<string, Type> dict = (Dictionary<string, Type>)HttpRuntime.Cache["myblog_Plug"];
if (dict == null)
{
LoadPlugs();
dict = HttpRuntime.Cache["myblog_Plug"] as Dictionary<string, Type>;
} //从缓存获取插件
if (dict.ContainsKey(className) || dict[className] != null)
{
Type t = dict[className];
t.GetConstructor(Type.EmptyTypes).Invoke(null); //查找不带参的构造函数
return (Control)t.GetConstructor(Type.EmptyTypes).Invoke(null); //调用返回
}
return null;
}
重载一个 ,处理构造函数多参情况
public static Control LoadPlug(string className, params object[] args)
{
Dictionary<string, Type> dict = (Dictionary<string, Type>)HttpRuntime.Cache["myblog_Plug"];
if (dict == null)
{
LoadPlugs();
dict = HttpRuntime.Cache["myblog_Plug"] as Dictionary<string, Type>;
}
if (dict.ContainsKey(className) || dict[className] != null)
{
Type t = dict[className];
Type[] ots=new Type[args.Length];
for (int i = 0; i < ots.Length; i++)
{
ots[i]=typeof(string);
}
if(t.GetConstructor(ots)!=null) //查找带 ots.Length;个参数的构造方法
return (Control)t.GetConstructor(ots).Invoke(args); //返回引用
}
return null;
}
属性定义 :
[AttributeUsage(AttributeTargets.Class)]
public class PlugAttribute : System.Attribute
{
private string _title;
private string _name;
public PlugAttribute(string name,string title)
: base()
{
_title = title;
_name = name;
return;
}
public string Title
{
get { return _title; }
}
public string Name
{
get { return _name; }
}
public PlugAttribute(string name, string title,string des)
: base()
{
_title = title;
_name = name;
return;
}
public override string ToString()
{
return _title;
}
}
待续..
