一个高效反射类

1.项目中有需要用到反射的地方，仔细研究了下反射，其效率并不高

还好微软提供了IL的编程方法，自己实现了一个高效反射类

下面举些常用例子：

我们反射出.NETFramework中的一个未公开的类 SessionStateUtility 并调用其私有方法 Deserialize

public static SessionStateStoreData Deserialize(HttpContext context, Stream stream)
        {
           DynamicMethodPrivoder _sessionStateUtility=new DynamicMethodPrivoder(typeof(SessionStateUtility), null);
            return _sessionStateUtility.MethodInvoke("Deserialize", context, stream) as SessionStateStoreData;
        }

注意：由于DynamicMethodPrivoder.Deserialize 是静态方法  所以DynamicMethodPrivoder构造的第二个参数为null

我们反射出 HttpContext下的一个 HttpSessionStateContainer 对象中 的私有字段 _sessionItems并获取它的值

public static SessionStateStoreData GetSessionStoreDate(HttpContext context)
        {
            IHttpSessionState container = SessionStateUtility.GetHttpSessionStateFromContext(context);
            Type _containerType = typeof(HttpSessionStateContainer);
            DynamicMethodPrivoder _containerPrivoder = new DynamicMethodPrivoder(_containerType, container);
            ISessionStateItemCollection sessionItems = _containerPrivoder.Field("_sessionItems") as ISessionStateItemCollection;
            HttpStaticObjectsCollection staticObjects = container.StaticObjects;
            return new SessionStateStoreData(sessionItems, staticObjects, container.Timeout);
        }

废话不多说了  直接上源码：https://files.cnblogs.com/dint/DynamicMethodPrivoder.rar