.net反射技术封装2011-04-05 博客园 zucky如果有人问你,如何调用一个类的private的方法或访问一个类的私有成员,如果你不 知道反射的话,你会告诉他不可以。但是有了反射,这一切都成为可能。我有时候会想, 既然使用private来限制访问,为什么又要用反射去破坏这种限制呢?也许可以通过侧面 来解释这个问题,如果你要维护类的封装性,那请不要用反射,反射会破坏类的封装性。但反正某些情况下,又会变得相当地有用,比如你有一个dll,其中很多类被声明为 internal,如果你要使用这些类,而又无法修改源代码的话,你就可以使用反射了,最近 总结了一下,对反射做了一个封装。由于代码比较简单,没有做注释。using System; using System.Collections.Generic; using System.Text; using System.Reflection; namespace UsefulUtility { public class Invoker { private static BindingFlags flags = BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.IgnoreCase; public static Type GetType(Assembly asm, string typeFullName) { return asm.GetType(typeFullName); } public static Type GetInnerType(string hiddenTypeName, Type outerType) { Module typeModule = outerType.Module; return typeModule.GetType(hiddenTypeName); } public static MethodInfo GetMethod(Type type, string funcName, Type[] paramTypes) { if (paramTypes != null) return type.GetMethod(funcName, flags, null, paramTypes, null); else return type.GetMethod(funcName, flags); } public static MethodInfo GetMethod(Type type, string funcName) { return GetMethod(type, funcName, null); } public static object CallMethod(object obj, string funcName, params object[] parameters) { Type type = obj.GetType(); MethodInfo method = GetMethod(type, funcName, GetTypesFromObjects(parameters)); return method.Invoke(obj, parameters); } public static object CallStaticMethod(Type type, string funcName, params object[] parameters) { MethodInfo method = GetMethod(type, funcName, GetTypesFromObjects(parameters)); return method.Invoke(null, parameters); } public static object GetProperty(object obj, string propertyName) { return GetProperty(obj, propertyName, null); } public static object GetProperty(object obj, string propertyName, params object[] index) { Type type = obj.GetType(); return type.GetProperty(propertyName, flags).GetValue(obj, index); } public static object GetStaticProperty(Type type, string propertyName) { return GetStaticProperty(type, propertyName, null); } public static object GetStaticProperty(Type type, string propertyName, params object[] index) { return type.GetProperty(propertyName, flags).GetValue(null, index); } public static void SetProperty(object obj, string propertyName, object value) { SetProperty(obj, propertyName, value, null); } public static void SetProperty(object obj, string propertyName, object value, params object[] index) { Type type = obj.GetType(); type.GetProperty(propertyName, flags).SetValue(obj, value, index); } public static void SetStaticProperty(Type type, string propertyName, object value) { SetStaticProperty(type, propertyName, value, null); } public static void SetStaticProperty(Type type, string propertyName, object value, params object[] index) { type.GetProperty(propertyName, flags).SetValue(null, value, index); } public static object GetField(object obj, string fieldName) { Type type = obj.GetType(); return type.GetField(fieldName, flags).GetValue (obj); } public static object GetSaticField(Type type, string fieldName) { return type.GetField(fieldName, flags).GetValue (null); } public static void SetField(object obj, string fieldName, object value) { Type type = obj.GetType(); type.GetField(fieldName, flags).SetValue(obj, value); } public static void SetStaticField(Type type, string fieldName, object value) { type.GetField(fieldName, flags).SetValue(null, value); } private static ConstructorInfo GetConstructor(Type type, Type[] paramTypes) { return type.GetConstructor(paramTypes); } public static object CreateInstance(Type type, Type[] paramTypes, params object[] parameters) { return GetConstructor(type, paramTypes).Invoke (parameters); } public static object CreateInstance(Type type, params object [] parameters) { return GetConstructor(type, GetTypesFromObjects (parameters)).Invoke(parameters); } private static Type[] GetTypesFromObjects(object[] objs) { Type[] types = new Type[objs.Length]; for (int i = 0; i < types.Length; i++) types[i] = objs[i].GetType(); return types; } public static void AddEventHandler(object obj, string eventName, MethodInfo method, object methodOwner) { EventInfo eventInfo = obj.GetType().GetEvent (eventName, flags); Delegate eventDeleg = Delegate.CreateDelegate (eventInfo.EventHandlerType, methodOwner, method); eventInfo.AddEventHandler(obj, eventDeleg); } public static void RemoveEventHandler(object obj, string eventName, MethodInfo method,object methodOwner) { EventInfo eventInfo = obj.GetType().GetEvent (eventName, flags); Delegate eventDeleg = Delegate.CreateDelegate (eventInfo.EventHandlerType, methodOwner, method); eventInfo.RemoveEventHandler(obj, eventDeleg); } } }
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