VS 2010 No method to override error

[Deborah Palmer McCain]

As I indicated to others who kindly tried to help, the given code is not mine, but rather the MSDN CS01150 to fix the error "no method to override". I just don't know how to change it, but will muddle through tomorrow. The error appears for a line which is blank...which threw me into a confused abyss. This is the final error on many lines of code, so, of course,it will give me the most trouble in fixing. I am just learning, so I truly appreciate the help.

[Luc Pattyn]

The concept may be shocking and new to you, however even Microsoft once in a while includes a little bug in their code, not all sample code snippets are correct. This has become a fact of life, you'll have to learn and live with it. :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

[Keith Barrow]

Deborah Palmer McCain wrote:

Should this be simple deduction and logical?

Pretty much always in IT To work this through, a basic [incomplete] definition of a few keywords is probably helpful: abstract: Whatever is declared abstract is missing or incomplete. A the class level this means that the class can't be instantiated directly, so it must be subclassed before use. For members of the class marked abstract you don't declare a body (e.g. public abstract int f();), and you must override in a subclass unless the subclass is also abstract. All abstract members are inherently virtual virtual This isn't in the example, but it marks a method as being overridable, that is subclasses can (as opposed to must) override them in a non-abstract subclass. override Members marked as overridden "replace" the superclass's virtual/abstract method. This can be summed up with the following code:

public abstract class Foo
{
public abstract void Bar();
}

public abstract class Baz : Foo
{
//Not-necessary to implement Bar() as Baz is also abstract
public virtual void Quux()
{
}

public virtual void Grault()
{
}

}

public class Corge : Foo
{
public override void Bar()
{
//As this is non-abstract it must implement Bar()
}

public override void Quux()
{
    //Overides virtual method
}

//Not-necessary to override Grault, but it is possible as per Quux().

}

Now to your problem. "No method to override", the word override only appears once, so we know this line is the problem:

public override int f()
{
...
}

So what are the preconditions for overriding? The method must override a method in a superclass that is marked as abstract or virtual. The method apparently being overridden is marked as abstract. It put italics on "apparently" as, in reality, MyClass2 doesn't have a superclass (as PiebaldConsultant has replied):

abstract public class MyClass2

the fix is now easy:

abstract public class MyClass2: MyClass1

Sort of a cross between Lawrence of Arabia and Dilbert.[

[Lost User]

Well you have copied the sample code from here[^] which has been specifically written to generate a CS0115 error. What other result were you expecting to get?

Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman

[prasun r]

Haha that's a good one 5/5

[PIEBALDconsult]

No the code correctly demonstrates how to generate the error.

[PIEBALDconsult]

So where is your code? We can't help you without it.

[Deborah Palmer McCain]

Thank you for your detailed explanation of the issue. It helped alot, and even though the issue was resolved, your detailed assistance is appreciated.

[Deborah Palmer McCain]

I plead ignorance (which is becoming less easy). There is now an arc in my learning curve.

[Deborah Palmer McCain]

At the risk of causing anyone to be rabid, why would one want to generate an error? Wouldn't someone go to MSDN for assistance? I probably should move to the rant page, as I am not posing legitimate issues.

[Lost User]

I usually plead senility, it works every time. ;)

Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman