Object model=Assembly.Load(“程序集”).CreateInstance(命名空间.类名);

object obj2 = Type.GetType("MyClass").GetMethod("Add").Invoke(obj,null);

obj2是返回值

Activator.CreateInstance会调用dll中类的构造函数，如果你的类里面没有提供无参的构造函数

Assembly _Assembly = Assembly.Load("程序集名");
Type _Type = _Assembly.GetType("完整类名");
Form _Form = (Form)Activator.CreateInstance(_Type);
System.Reflection.EventInfo _EventInfo = _Type.GetEvent("RemoveFormHandler");

_EventInfo.AddEventHandler(_Form, new Com.Psi.UIBase.RemoveFormDelegate(RemoveForm));

System.Reflection.FieldInfo _FieldInfoSys = _Type.GetField("m_SysDataSet");
_FieldInfoSys.SetValue(_Form, this.m_TableDataSet);

_Form.Show()

//创建对象
            ////Assembly assembly = Assembly.LoadFile();
            //Assembly assembly = Assembly.Load("Test2");
            //Object obj1 = assembly.CreateInstance("Test2.Reflect.Operate", false);//assembly.CreateInstance内部调用Activator.CreateInstance
            //Object obj2 = assembly.CreateInstance("Test2.Reflect.Operate", false, BindingFlags.Default, Type.DefaultBinder, new Object[] { "123" }, System.Globalization.CultureInfo.CurrentCulture, new Object[] { });

            //Object obj3 = Activator.CreateInstance(Type.GetType("Test2.Reflect.Operate"));
            //Object obj4 = Activator.CreateInstance(Type.GetType("Test2.Reflect.Operate"),"456");

            //Type type = Type.GetType("Test2.Reflect.Operate");
            ////每次调用InvokeMemeber方法时，它必须先绑定到一个特定的成员，然后才能调用它。
            ////如果每次调用一个成员时都让绑定器选择适当的成员，那么将是非常耗时的。。建议用：一次绑定，多次调用
            //Object obj5 = type.InvokeMember("Operate", BindingFlags.CreateInstance, null, null, new Object[] { "789" });
            
            //Assembly assembly = Assembly.Load("Test2");
            //Type t = assembly.GetType("Test2.Reflect.Operate");
            //ConstructorInfo constructorInfo = t.GetConstructor(new Type[] { typeof(string) });
            //Object obj6 = constructorInfo.Invoke(new Object[] { "kkkkkkkk" });

            //AppDomain appDomain = AppDomain.CurrentDomain;  //内部也是调用的Activator.CreateInstance
            //ObjectHandle objHandle = appDomain.CreateInstance("Test2", "Test2.Reflect.Operate");
            //Object obj7 = objHandle.Unwrap();

            //除了数组和委托之外，其他都可以利用上述通过反射创建对象

            //访问变量
            //Assembly assembly = Assembly.Load("Test2");
            //Object obj1 = assembly.CreateInstance("Test2.Reflect.Operate", false);
            //Type type = Type.GetType("Test2.Reflect.Operate");
            //FieldInfo fieldInfo = type.GetField("_Address");  //获取私有字段  ("_Address",BindingFlags.NoPublic|bindingFlags.instance)
            //Object ret= fieldInfo.GetValue(obj1);

//私有静态字段，BindingFlags的次序必须一致。FieldInfo fieldInfo = type.GetField("_instance", BindingFlags.Static | BindingFlags.NonPublic);

            //属性
            //Assembly assembly = Assembly.Load("Test2");
            //Object obj1 = assembly.CreateInstance("Test2.Reflect.Operate", false);
            //Type type = Type.GetType("Test2.Reflect.Operate");
            //PropertyInfo propertyInfo = type.GetProperty("Val");
            //propertyInfo.SetValue(obj1, 1, null); //为属性赋值
            //Object ret = propertyInfo.GetValue(obj1, null);//获取属性的值

            //索引器
            //Assembly assembly = Assembly.Load("Test2");
            //Object obj1 = assembly.CreateInstance("Test2.Reflect.Operate", false);
            //Type type = Type.GetType("Test2.Reflect.Operate");
            //PropertyInfo propertyInfo = type.GetProperty("Item");
            //Object ret = propertyInfo.GetValue(obj1,new Object[]{2});   //获取索引器的值
            //propertyInfo.SetValue(obj1, 1,new Object[]{6});             //为索引器赋值
            //ret = propertyInfo.GetValue(obj1, new Object[] { 6 });      //获取索引器的值
           

            //访问静态方法
            //Assembly assembly = Assembly.Load("Test2");
            //Type t = assembly.GetType("Test2.Reflect.Operate");
            //MethodInfo met = t.GetMethod("ExcStaticMethod", new Type[] { typeof(string) });
            //Object ret = met.Invoke(null, new Object[] { "参数" });

            //Type t = Type.GetType("Test2.Reflect.Operate");//如果在同一个项目中或已经添加引用
            //MethodInfo met = t.GetMethod("ExcStaticMethod", new Type[] { typeof(string) });
            //Object ret = met.Invoke(null, new Object[] { "传递的参数" });
          
            //访问方法
            //Assembly assembly = Assembly.Load("Test2");
            //Object obj1 = assembly.CreateInstance("Test2.Reflect.Operate", false);
            //Type t = assembly.GetType("Test2.Reflect.Operate");
            //MethodInfo met = t.GetMethod("ExcMethod", new Type[] {typeof(string) });
            //Object ret = met.Invoke(obj1, new Object[] {"参数" });

            //事件
            //Assembly assemblytemp = Assembly.Load("Test2");
            //Object objtemp = assemblytemp.CreateInstance("Test2.Reflect.Operate", false);
            //Type te = Type.GetType("Test2.Reflect.Operate");
            //EventInfo evnetInfo = te.GetEvent("hander");
            ////EventHandler eh = new EventHandler(delegate(Object obj,EventArgs e) { Console.WriteLine("LLLLLLL"); });
            //EventHandler eh = new EventHandler(delegate { Console.WriteLine("LLLLLLL"); });
            //evnetInfo.AddEventHandler(objtemp, eh);
            //MethodInfo met = te.GetMethod("ExcEvent", new Type[] { });
            //Object ret = met.Invoke(objtemp, new Object[] {  });

本文转自武沛齐博客园博客，原文链接：http://www.cnblogs.com/wupeiqi/p/3357538.html，如需转载请自行联系原作者