Home > Cannot Create > Reflection Cannot Create An Abstract Class

Reflection Cannot Create An Abstract Class


Dev centers Windows Office Visual Studio Microsoft Azure More... In the next chapter, we will do a more advanced example and introduce abstract methods as well. You can't do that - it doesn't have any constructors (a static class is both abstract and sealed). However, you can instantiate an instance of a class that implements that interface (provides an implementation for its methods), which in your case is the User class. http://stevemattley.com/cannot-create/qt-cannot-create-a-qwidget.html

Which word should I use for "to drive (a car)"? Activator.CreateInstance Method (Type) .NET Framework (current version) Other Versions Visual Studio 2010 .NET Framework 4 Silverlight Visual Studio 2008 .NET Framework 3.5 .NET Framework 3.0 .NET Framework 2.0  Creates an instance As pointed out by @luisrudge we're actually trying to ignore the abstract type, not bind to it. I'm assuming the method is static, as otherwise it couldn't be placed in a static class... http://stackoverflow.com/questions/7137132/c-sharp-activator-createinstance-drops-cannot-create-an-abstract-class-excep

Cannot Create Instance Of Abstract Class Or Interface C#

Note, however, that someone who asks for a "device to boil water" would not be given a "device to boil water", but an "Acme 359 Electric Teakettle". If you need an instance, either: remove the abstract modifier from the class. Bhagavad Geeta 4.14 Non-Repetitive Quine How much time would it take for a planet scale Miller-Urey experiment to generate intelligent life How do I deal with my current employer not respecting Dec 13 '06 #1 Post Reply Share this Question 2 Replies P: n/a Dave Sexton Hi, // create an instance on which the method will be invoked DerivedClass obj = new

If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. This doesn't work. LukeForder commented Jul 2, 2014 In the end I created a custom implementation an IModelBinder to handle the deserialization of the collection. Stop that.

Join them; it only takes a minute: Sign up C# Activator.CreateInstance() drops “Cannot create an abstract class” exception up vote 1 down vote favorite I am trying to dynamicly load .DLL Activator.createinstance C# Yes. –Sergey Teplyakov Apr 17 '13 at 10:48 add a comment| 4 Answers 4 active oldest votes up vote 2 down vote Calling the constructor on an abstract class is equivalent You may need to implement a few methods/properties (but for debugging purposes, a throw new NotImplementedException(); may do as the body of the method/property). read review share|improve this answer answered Apr 17 '13 at 8:29 Heinzi 98.7k28207328 add a comment| up vote 0 down vote You cannot create an instance of an abstract class.

MethodAccessExceptionThe caller does not have permission to call this constructor. Source=mscorlib StackTrace: at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object RemarksThe constructor to be invoked must be accessible.Note Starting with the .NET Framework 2.0 Service Pack 1, this method can be used to access nonpublic types if the caller has been granted Already have an account?

Activator.createinstance C#

Source=mscorlib StackTrace: at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, https://bytes.com/topic/c-sharp/answers/576736-reflection-abstract-classes Note that the .NET Framework versions 2.0, 3.0, and 3.5 all use CLR version 2.0.FileLoadExceptionAn assembly or module was loaded twice with two different evidences. -or-The assembly name or code base Cannot Create Instance Of Abstract Class Or Interface C# Graph visualization: Leave gap between vertex and endpoint of edge Possible repercussions from assault between coworkers outside the office Ballpark salary equivalent today of "healthcare benefits" in the US? This MAY be solved when #2061 is complete. Sign up for free to join this conversation on GitHub.

Does anything in the .DLL class code can cause this kind of exception? http://stevemattley.com/cannot-create/sabnzbd-cannot-create-directory.html As per the requirement , i need to load this dll & create it's class object. Insults are not welcome. Read on.

A derived class, however, can call the constructor of its base. –Thorsten Dittmar Apr 17 '13 at 8:30 Okay, agreed. Hence i able to load dynamically the active DLL , as per the Registry value set by our application. Now try creating an instance of the FourLeggedAnimal class instead: FourLeggedAnimal someAnimal = new FourLeggedAnimal(); You will get this fine compiler error: Cannot create an instance of the abstract class or Check This Out Instead, you have to subclass them, as taught in the chapter on inheritance, and create an instance of your subclass.

turn it on and off), and one might plausibly want a list of e.g. "devices with power switches that will need to be turned off at the end of the day", Top Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine Community Forums Blogs Codeplex Support Self support Programs BizSpark (for startups) Microsoft Imagine (for students) United States (English) Newsletter Privacy & cookies

TargetInvocationExceptionThe constructor being called throws an exception.

Looking at the source, it seems the problem is caused by; private static void HandleReferenceTypeCollectionElement(BindingContext bindingContext, IList model, int count, object o) { // If the instance specified in the binder From MSDN The abstract modifier indicates that the thing being modified has a missing or incomplete implementation. So again, you won't be able to do anything with it. When answering a question please: Read the question carefully.

A story behind a weird inductor As a monk, can I use Deflect Missiles to protect my ally? C++ calculator using classes Why is the 'You talking to me' speech from the movie 'Taxi Driver' so famous? How does Gandalf end up on the roof of Isengard? this contact form Not the answer you're looking for?

Should I allow my child to make an alternate meal if they do not like anything served at mealtime? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Sergey Alexandrovich Kryukov 21-Jan-13 1:34am No. In the context of this quote, how many 'chips/sockets' do personal computers contain?

This can be done by using the base keyword, which refers to the class we inherit from: abstract class FourLeggedAnimal { public virtual string Describe() { return "This animal has four more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Reload to refresh your session. Activator Class Activator Methods CreateInstance Method CreateInstance Method CreateInstance Method (String, String) CreateInstance Method (String, String) CreateInstance Method (String, String) CreateInstance Method (ActivationContext) CreateInstance Method (ActivationContext, String[]) CreateInstance Method (AppDomain, String,

In this case, you cannot include a reference to the assembly in the project and cannot make early-bound calls to the type's members. It really depends on what you do. e.g. ... A typical interface would be analogous to the description "a device with a power switch".

InvalidComObjectExceptionThe COM type was not obtained through GetTypeFromProgID or GetTypeFromCLSID. Join them; it only takes a minute: Sign up Cannot create an instance of the abstract class or interface up vote 19 down vote favorite 5 I have a class and This is my understanding .If i'm right ,then it seems to be nice way. To work around this limitation, the following example uses the CreateInstance method along with reflection to assign a value to the Person object's Name property and to display its value.

Associated enumeration: SecurityPermissionFlag.UnmanagedCodeReflectionPermissionfor accessing a nonpublic type when the grant set of the nonpublic type is restricted to the caller's grant set or to a subset thereof. Custodians of the Super-Duper-Happy-Path member jchannon commented Jun 18, 2014 Out of interest, does making it not abstract work? By definition, it is designed as a class which cannot be instantiated, ever. In my case i need to load Main DLL which is containing this Abstract class ,needs to loded as per the Registry key status.

Post your question and get tips & solutions from a community of 418,791 IT Pros & Developers. MemberAccessExceptionCannot create an instance of an abstract class, or this member was invoked with a late-binding mechanism. Given the hints solve the puzzle Graph visualization: Leave gap between vertex and endpoint of edge Safety - Improve braking power in wet conditions Start a coup online without the government