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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.
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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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Good, I didn't want to have to say that again.
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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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Doesn't Abstract class does that?
It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD
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Have an abstract class implement the interface, then derive from that.
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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()
{
}
public abstract void Different();
}
public abstract class Baz : Bar
{
public abstract void Different()
{
}
}
public abstract class Quux : Bar
{
public abstract void Different()
{
}
}
but also you should look uup the new(here[^]) and virtual(here[^]) modifiers too
CCC solved so far: 2 (including a Hard One!)
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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
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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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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. 
The latest nation. Procrastination.
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Again, haven't tested but I'm pretty sure. It's a method I employ quite often.
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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
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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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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
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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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Yes I do. 
It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD
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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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I have a little confusion on that, Well If use the proxy server to prevent a site for browsing then it will create a problem to work in a remote environment...You cannot connect any remote IP via proxy server...
Thanks
Md. Marufuzzaman
Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.
I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.
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Md. Marufuzzaman wrote: ...You cannot connect any remote IP via proxy server
If you're saying that you cannot use a proxy server to make a connection from inside the network to remote IP's, then you're wrong. Proxy servers do support Socks proxies. Whether or your applications support it is a whole other issue.
If you are referring to connecting from an outside IP to a machine inside the network, that's what your firewall and/or VPN server is for.
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Thanks for your explanation, I don’t know but I face to connect / ping any remote IP via proxy server;
Thanks
Md. Marufuzzaman
Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.
I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.
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hello,
I am trying to hide the actions buttons in the title bar of a window.
I use user32.dll and I do
var style = GetWindowLong(pHandle, GWL_STYLE);
style = (int)(style & ~WS_SYSMENU & ~WS_BORDERICON );
SetWindowLong(pHandle, GWL_STYLE, style);
result = SetWindowPos(pHandle, IntPtr.Zero, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER);
The problem is that this code is execute in a different thread not the same thread which start my window application, so the setwindowlong bloc my application.
Does someone has got an idea?
Thanks in advance 
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If what you are trying to do is remove the Minimize, Maximize, Close and Normalize buttons, then "Form.ControlBox=false" is what you want. Beware though, it will remove the system menu as well.
No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.
This message is made of fully recyclable Zeros and Ones
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No the problem is that I start an application with Process.Start(file.exe)
I have no power on this application, I can't change controlBox
But I want to hide the actions buttons of this applciation window so I use user32.dll to do this
I am clear?
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I think I see what you are trying, but I don't know if you can do it for any process - I certainly hope you can't as that would effectively give control of a process to another process. Not something I would realy want on my PC!
No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.
This message is made of fully recyclable Zeros and Ones
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yes I understand.
But it's strange because when I did it in the same thread I can do it...
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