C# function call and variable a abstract class extends

Question

0.00/5 (No votes)

See more:

Hi there i have a question about moving code from JAVA to C#.
But i got problem about making function call and variable.

What I have tried:

in JAVA i gor this:

C#

public abstract class VisibleObjectController<T extends VisibleObject> {}

and in C# i did this:

C#

public abstract class VisibleObjectController<T> where T : VisibleObject {}

NOW i dont know about variable and function call this VisibleObjectController class in c#
this is JAVA:

C#

private final VisibleObjectController< ? extends VisibleObject > controller;

    public VisibleObjectController< ? extends VisibleObject > getController() {
        return controller;
    }

So how can i do the same in c#?

Posted 24-Nov-16 21:59pm

EADever

Updated 25-Nov-16 4:49am

v10

Add a Solution

Comments

Richard Deeming 25-Nov-16 13:57pm

AFAIK, Java's wilcard type parameters aren't supported in C#.

If it was just the method, you'd add a generic parameter to the method:

public VisibleObjectContainer<T> GetController<T>() where T : VisibleObject { ... }

But since you're using a field as well, you'd probably need a generic class to contain it:

public class MyContainer<T> where T : VisibleObject
{
    private VisibleObjectController<T> controller;
    
    public VisibleObjectController<T> GetController()
    {
        return controller;
    }
}

Perhaps if you could update your question with more information about how you're using the getController method, someone might be able to come up with another suggestion.

EADever 26-Nov-16 0:53am

I want to use these function call and variable inside VisibleObject class it self.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Ehsan Sajjad · Answer 1 · 2016-11-25T04:49:00

Solution 1

You need to create a generic method, same way you did in the class declaration using where keyword with T in the following syntax:

C#

private VisibleObjectController<t> controller;
 
    public VisibleObjectController<t> getController<t>() where t : VisibleObject {
        return controller;
    }

Posted 25-Nov-16 4:49am

Ehsan Sajjad

Updated 25-Nov-16 4:51am

v5

Comments

EADever 25-Nov-16 11:45am

`private VisibleObjectController<t> controller;` have error: t doesn't exist and function getController<t>() can't return to controller

Ehsan Sajjad 25-Nov-16 11:58am

is the code in your generic abstract class defined above?

EADever 26-Nov-16 4:31am

i mean these function call and variable using from another class, not in VisibleObjectController.
eg. need to use in public abstract class VisibleObject.

Ehsan Sajjad 26-Nov-16 9:43am

That method can be in in a non generic class but the field cannot