New Methods for existing types?

Reelix

I was wondering something... Is it possible do do something like:

string s1 = "12345";
string s2 = s1.RemoveNum("5");
MessageBox.Show(s2);

Where further down you add the RemoveNum() method ONTO the string type? something like...

public static string add RemoveNum(string num)
{
return string.Replace(num, "");
}

? Just wondering... :)

-= Reelix =-

ptr2void

Why dont you just test this instead of wondering?? ;) ;)

Reelix

public static string add RemoveNum(string num) { return string.Replace(num, ""); } obviously doesnt work (Seeing as I made it up on the spot :p) Was googling around, and couldn't find anything particularly useful... You can't override, since it doesnt exist... I'm just wondering if there's a way TO do it :)

-= Reelix =-

CPallini

OOP way to augment functionality is inheritance, but no luck this time: String class is sealed. :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

Reelix

Dang :/ No evil way to hack through it? :p

-= Reelix =-

CPallini

Of course there are ways, evil, but you have to ask the devil. :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

Reelix

*Decompiles the .NET Framework into Assembly* *Inserts a new String Method* *Recompiles* *Looks Innocent* *Thinks...* Dang... Will only work on my PC :laugh:

-= Reelix =-

laserbaronen

check out extension methods

betonglasermur.FeedDwarf(pur_is, 17);
ProcessStartupInfo.AintNotCreateNoWindow = (false && !true) != (true || false) ? false == true ? true : false : (true != false && false);

Morgonen är tröttmans mecka

laserbaronen

http://www.codeproject.com/KB/cs/Using_Extension_Methods.aspx[^]

betonglasermur.FeedDwarf(pur_is, 17);
ProcessStartupInfo.AintNotCreateNoWindow = (false && !true) != (true || false) ? false == true ? true : false : (true != false && false);

Morgonen är tröttmans mecka

buchstaben

there is a way, using extension methods. but this requires c# 3.0 .. Extension methods are static methods that can be invoked using instance method syntax. In effect, extension methods make it possible to extend existing types and constructed types with additional methods.

Reelix

VICTORY!!!

using System;

class String
{
    public string RemoveFirst(string num)
    {
        //num = num.Remove(num);
        string toReturn = num.Remove(0, 1);
        return toReturn;
        //Console.WriteLine("Hackz0red!");
    }
}

class ExtMethodDemo
{
    static void Main(string\[\] args)
    {
        String r1 = new String();
        string r2 = r1.RemoveFirst("12345");
        Console.WriteLine(r2);
        Console.ReadLine();
    }
}

Thanks laserbaronen!!! :D

-= Reelix =-

laserbaronen

hmm o_o

public static class ExtMethods
{
public static string RemoveFirst(this string str)
{
return str.Remove(0,1);
}
}
class ExtMethodDemo
{
static void Main(string[] args)
{
string r1 = "12345".RemoveFirst();
Console.WriteLine(r1);
Console.ReadLine();
}
}

was thinking something like this

betonglasermur.FeedDwarf(pur_is, 17);
ProcessStartupInfo.AintNotCreateNoWindow = (false && !true) != (true || false) ? false == true ? true : false : (true != false && false);

Morgonen är tröttmans mecka

modified on Tuesday, May 20, 2008 10:05 AM

PIEBALDconsult

buchstaben wrote:

In effect, extension methods make it possible

make it appear possible, when in fact it isn't. :-D

buchstaben

PIEBALDconsult wrote:

buchstaben wrote: In effect, extension methods make it possible make it appear possible, when in fact it isn't.

that's just what c# 3.0 specification says.