A question on inheritance again - C# Discussion Boards

Re: an exception with this code

9-Oct-09 9:01

Don't you think maybe this belongs in the Database section as opposed to the C# section?

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Md. Marufuzzaman9-Oct-09 9:08

Md. Marufuzzaman

9-Oct-09 9:08

You should post it to the General Database forum.. Smile | :)

Thanks
Md. Marufuzzaman

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Change color of ribbon control.....

yogeshdew9-Oct-09 6:28

yogeshdew

9-Oct-09 6:28

Hi,
i have RibbonControl.dll, used in my application. but i want to change the base color of this ribbon control. look at this demo project which i have downloaded from codeproject.com itself.
http://www.codeproject.com/KB/WPF/ribboncontrol/ribboncontrol_demo.zip
can any body help me out..
Thanks!

Re: Change color of ribbon control.....

Henry Minute9-Oct-09 9:11

Henry Minute

9-Oct-09 9:11

At the bottom of the article that you got the RibbonControl from, you will see a section for messages. Those messages go directly to the author of the code.

If anyone knows the answer to your problem he/she's the guy/gal.

Henry Minute

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A question on inheritance again

Dewald9-Oct-09 4:45

Dewald

9-Oct-09 4:45

I feel I should know the answer to this but I rarely use inheritance aggressively and now I'm stuck on a basic concept.

Let's say I have an interface so I can inherit from it from a number of inheriting classes. Each will implement certain functions as defined by the interface. So far so good. Now let's say there is one function that I want to be the same for all inheriting classes. Is it really necessary to implement the function in every inheriting class? Isn't there a way I could implement the function once so that every class which inherits this interface already has the implemented function?

Your help is appreciated.

EliottA9-Oct-09 4:48

9-Oct-09 4:48

You don't inherit interfaces, you implement them. An interface can be thought of as a contract, it dictates to a class what methods, functions and actions it must make use of.

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PIEBALDconsult9-Oct-09 4:52

PIEBALDconsult

9-Oct-09 4:52

Good, I didn't want to have to say that again.

EliottA9-Oct-09 5:01

9-Oct-09 5:01

I figured by his post he still doesn't grasp this concept, which is understandable from a beginners point of view. Especially if he came from Java. Hopefully, it's the last time.

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dan!sh 9-Oct-09 4:53

9-Oct-09 4:53

Doesn't Abstract class does that?

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

PIEBALDconsult9-Oct-09 4:53

PIEBALDconsult

9-Oct-09 4:53

Have an abstract class implement the interface, then derive from that.

How to block a Website using c#

Keith Barrow9-Oct-09 5:45

Keith Barrow

9-Oct-09 5:45

Dewald wrote:
feel I should know the answer to this but I rarely use inheritance aggressively

Well you should, but remember to Favour Composition over inheritance[^]

The following should help with your question:

public interface IFoo
{
    void Common();
    void Different();
}

public abstract class Bar : IFoo
{
    void Common()
    {
        //Common code here
    }

    public abstract void Different();
}
  
public abstract class Baz : Bar
{
    public abstract void Different()
    {
        //Baz implmentation
    }
}

public abstract class Quux : Bar
{
    public abstract void Different()
    {
        //Quux implmentation
    }
}

but also you should look uup the new(here[^]) and virtual(here[^]) modifiers too

CCC solved so far: 2 (including a Hard One!)

chaithusworld9-Oct-09 4:32

chaithusworld

9-Oct-09 4:32

Hai
I am developing an C# application(not asp.net) in which I have to get the urls typed by the user in the browser and I have to compare the urls with a set of urls and decide whether to allow or to deny the user to navigate to the website.
I have tried with appending to C:\windows\system32\drivers\etc\hosts file but its not working.So Is there any way I can do this?How to block the sites by getting the urls.Can someone suggest me how to approach to the solution with some sites or code that can help me.

Thank You
Chaithu

EliottA9-Oct-09 4:43

9-Oct-09 4:43

The hosts file should work fine if you point those websites to something like 127.0.0.1 or a website on your intranet informing them the site is blocked.

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Dan Neely9-Oct-09 5:57

Dan Neely

9-Oct-09 5:57

Are you sure, I thought that file only was read at boot time? I haven't messed with it in a few years though, much better adblock options now. Cool | :cool:

The latest nation. Procrastination.

EliottA9-Oct-09 5:58

9-Oct-09 5:58

Again, haven't tested but I'm pretty sure. It's a method I employ quite often.

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dan!sh 9-Oct-09 4:49

9-Oct-09 4:49

chaithusworld wrote:
I have tried with appending to C:\windows\system32\drivers\etc\hosts file but its not working.

Depends on how and what you are appending. If you are doing this correct, it will work.

Still, if the user goes and deletes the entry manually, can access the website. If you are creating something like a firewall for a network, you should look into routing and remote access service. I guess are some API that can help.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

EliottA9-Oct-09 5:02

9-Oct-09 5:02

Furthermore, to add, if a user accesses the website via IP (if you reroute the domain instead of the IP) then the user will still be able to access the website.

To the OP: Have you tried blocking the websites from beyond the user-level, via your router or potentially server which is above the user-level?

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dan!sh 9-Oct-09 5:09

9-Oct-09 5:09

If a website exposes its IP, it is considered a security flaw by many. Anyways, it is not easy to create a firewall isn't it? People with knowledge or curiosity would try to break that.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

EliottA9-Oct-09 5:11

9-Oct-09 5:11

Every website exposes their IP, simply ping the domain name and you will get the server IP it is hosted on (gets more complicated if a pool of servers with various IPs host the website) but either way, you get the point.

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dan!sh 9-Oct-09 5:41

9-Oct-09 5:41

Yes I do.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Dave Kreskowiak9-Oct-09 6:13

Dave Kreskowiak

9-Oct-09 6:13

The only way to block websites, with any kind of security preventing the user from cirmuventing it, would be to properly setup a proxy server and your network to force any web browser to go through the proxy to get at the sites.

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