Re: Overriding ToString() with arguments - C# Discussion Boards

Re: determing the full name to My Music on the start menu

DaveyM6925-Jul-08 23:01

25-Jul-08 23:01

Environment.GetFolderPath(Environment.SpecialFolder.MyMusic);
will return a string with the full path of the current user's My Music folder

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: determing the full name to My Music on the start menu

Luc Pattyn26-Jul-08 2:47

Luc Pattyn

26-Jul-08 2:47

Dave is right,
For all those special folders you may be interested in, use Environment.GetFolderPath()
and Environment.SpecialFolder enumeration
They keep moving these things around from one Windows version to the next, so it really is the
only way to make it portable.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Overriding ToString() with arguments

JoeRip25-Jul-08 16:05

JoeRip

25-Jul-08 16:05

I have a struct:

public struct IITObjectPersistentID
     {
         public int highID;
         public int lowID;

         public IITObjectPersistentID(int HighID, int LowID)
         {
             highID = HighID;
             lowID = LowID;
         }

         public override string ToString()
         {
             return "{" + highID.ToString() + "." + lowID.ToString() + "}";
         }
     }

I have overridden ToString(), but I want to be able to specify the normal ToString() arguments. Ie, I want to be able to get the hex display of the numbers, too, like:

IITObjectPersistentID OPIDx = new IITObjectPersistentID(25,50);
string displayAsHex = OPIDx.ToString("X");

How can I write conditional code in the override statement that lets me pass arguments to OPIDx.ToString() ?

Re: Overriding ToString() with arguments

PIEBALDconsult25-Jul-08 19:35

PIEBALDconsult

25-Jul-08 19:35

You don't. You just overload ToString by writing a new ToString method that takes the argument. Just as int does.

public string 
ToString
(
    string Format
)            
{
    return "{" + highID.ToString ( Format ) + "." + lowID.ToString ( Format ) + "}" ;
}

Re: Overriding ToString() with arguments

JoeRip25-Jul-08 23:13

JoeRip

25-Jul-08 23:13

I'm sorry, your code confuses me. Are you saying I just need to remove the "override" portion of my method?

Re: Overriding ToString() with arguments

JoeRip25-Jul-08 23:51

JoeRip

25-Jul-08 23:51

You do appear to be saying that, then, as it worked! Thanks.

So for any subsequent readers, the answer is:

You write the first ToString method as "override" and without parameters - then you write more ToString() overloaded methods without the "override" conditional/declaration/whatever that part of the signature is.

So:

public struct IITObjectPersistentID
{
    public int highID;
    public int lowID;

    public IITObjectPersistentID(int HighID, int LowID)
    {
        highID = HighID;
        lowID = LowID;
    }

    public override string ToString()
    {
        return "{" + highID.ToString() + "." + lowID.ToString() + "}";
    }

    public string ToString(string Format)
    {
        return "{" + highID.ToString(Format) + "." + lowID.ToString(Format) + "}";
    }
}

Re: Overriding ToString() with arguments

PIEBALDconsult26-Jul-08 3:35

PIEBALDconsult

26-Jul-08 3:35

Correct, the term to remember here is "overload".

Re: Overriding ToString() with arguments

DaveyM6925-Jul-08 23:07

DaveyM69

25-Jul-08 23:07

You don't need to override ToString if your passing arguments.

Every object has a default ToString() with no parameters, which will return the objects name. If you need your own paramaterless ToString then you use override to override the default method with the same signature.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: Overriding ToString() with arguments

JoeRip25-Jul-08 23:12

JoeRip

25-Jul-08 23:12

I'm not following you.

My struct has two fields. The default ToString() simply returns the name of the struct.

I want my ToString to either return the format I provided {122345.67879} or, say, the same fields in hex {FFFFF.00000}.

(yes I realize that's not proper hex)

So how do I write my ToString override to accept an argument (like "X")?

Re: Overriding ToString() with arguments

DaveyM6925-Jul-08 23:29

DaveyM69

25-Jul-08 23:29

Voting 1 because you don't understand isn't going to get you very far on these forums!

I'm in a good mood today however so how about something like this?

public override string ToString() 
{
    return ToString(string.Empty);
}
public string ToString(string format)
{
    return "{" + highID.ToString(format) + "." + lowID.ToString(format) + "}";
}

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: Overriding ToString() with arguments

JoeRip25-Jul-08 23:43

JoeRip

25-Jul-08 23:43

Thanks - apparently the fix is not including the "override" declaration in the second ToString() method. This was preventing it from compiling.

Re: Overriding ToString() with arguments

BhadeliaImran26-Jul-08 2:23

BhadeliaImran

26-Jul-08 2:23

You just need to crate one more method in you structure with ToString which contains single argument. like
<pre>
public struct IITObjectPersistentID {
public int highID;
public int lowID;
public IITObjectPersistentID(int HighID, int LowID)
{
highID = HighID;
lowID = LowID;
}
public override string ToString()
{
return "{" + highID.ToString() + "." + lowID.ToString() + "}";
}

internal string ToString(string str)
{
//Do ur code here
}
}</pre>

Re: Overriding ToString() with arguments

Luc Pattyn26-Jul-08 2:53

Luc Pattyn

26-Jul-08 2:53

Hi,

there are no optional parameters in C#; each combination of parameters results in another method.

ToString() and ToString(string) are two different methods that share their name, but not their signature
(=list of parameter types).

Object class has a ToString() but not a ToString(string).

So when you class derives from Object, it needs an override to provide its own ToString()
and it is not allowed an override keyword on ToString(string).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

statusstrip <---data

nelsonpaixao25-Jul-08 14:34

nelsonpaixao

25-Jul-08 14:34

Hi,

I load sql data in datagridview, combobox, textbox but i can´t do it to statusstrip object.
At least in normal way. I pass it to other object and then to it.

Any sugestions?
thanks Smile | :)

Re: statusstrip <---data

Ed.Poore25-Jul-08 22:49

Ed.Poore

25-Jul-08 22:49

Can you explain in a bit more detail what you are trying to do. Putting data into a StatusStrip object is no different from other controls, the difference is that you can't do it easily through the designer (which is what I suspect you're trying to do) but you can through code.

form layout: rate this practice

nelsonpaixao25-Jul-08 14:18

nelsonpaixao

25-Jul-08 14:18

hi,

I have a application with 1 form (main_form) and 6 usercontrols(login_page, menu_page, item1_page, item2_page, item3_page, item4_page).

The form has inside all usercontrols!!!

When i want to enter menu_page i edit visible = true, and visible = false to other usercontrols
i use delegates to trigger events within any usercontrol or form

it works

someone does it other way? WTF | :WTF:

Re: form layout: rate this practice

PIEBALDconsult25-Jul-08 19:44

PIEBALDconsult

25-Jul-08 19:44

Sounds kinda like a home-grown tab control.

At least you're using usercontrols.

You'd have to describe more about how the user navigates.

Depending on what you're doing, I would probably pop up (modal) dialogs.

Typically, when the form loads, I would pop up the login_page.
Once logged in, the user sees the menu_page.
When the user selects a menu item, I pop up the appropriate item_page.

But, like cats, there are many ways to skin it.

decoding gzip http response

udikantz25-Jul-08 11:50

udikantz

25-Jul-08 11:50

hey im trying to make a program that uses some http features and analyze the response data ,
i have encounter a problem when i get responses which are encoded in this method:
Transfer-Encoding: chunked
Content-Encoding: gzip
does anyone have an idea how can i decode the returned data ?
so it will be readable.
thank you.

Net

modified on Friday, July 25, 2008 5:59 PM

Windows Services - Log On As User Account

dataminers25-Jul-08 11:29

dataminers

25-Jul-08 11:29

I write a windows service. It's log on as Local System account. I want to log on as user account for this service. For example administrator account or any other user account on windows. Ok, I can change Local System account to user account using with this steps;

My Computer --> Manage --> Services and Applications --> Services --> "MyService"

Click "LogOn" tab
Select "This account"
This account: type your account (For example .\Administrator)
Password: type your password

How can I write this operation code in C# ?

Best Regards...

Re: Windows Services - Log On As User Account

Mark Salsbery25-Jul-08 13:59

Mark Salsbery

25-Jul-08 13:59

You can specify an account using a ServiceProcessInstaller[^].

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How to check if a number can be dived by 8

Gareth H25-Jul-08 11:00

Gareth H

25-Jul-08 11:00

I have a loop (below) that has 64 iterations. Every 8 iterations i want to change an int. At the moment, i do the below, but its not a "nice" way to do to.

for (int i = 0; i < 64; i++)
{
    //doStuff

    if (i == 7 || i == 15 || i == 23 || i == 31 || i == 39 || i == 47 || i == 55)
    {
        //change int
    }                
}

So, does anyone know how I'd do a calculation to have the same effect as the above?

Regards,
Gareth.

(FKA gareth111)

Re: How to check if a number can be dived by 8 [modified]

Wendelius25-Jul-08 11:06

Wendelius

25-Jul-08 11:06

Hi,

Use modulus operator (%) and check that the remainder is 0

For example: 7%7 and 14%7 returns 0 while 8%7 and 15%7 returns 1 and so on.

for (int i = 0; i < 64; i++) {
   //doStuff
   if (i % 7 == 0) {
      //change int
   }
}

[addition]
Of course if you don't actually need the values between you can modify your loop incrementation:

for (int i = -1; i < 64; i=i+8){
   //doStuff
   if (i == 7 || i == 15 || i == 23 || i == 31 || i == 39 || i == 47 || i == 55)    {
      //change int
   }
}

[addition ends]

Hope this helps,

Mika

modified on Friday, July 25, 2008 5:33 PM

Re: How to check if a number can be dived by 8

Gareth H25-Jul-08 11:46

Gareth H

25-Jul-08 11:46

Cheers.

Regards,
Gareth.

(FKA gareth111)

Re: How to check if a number can be dived by 8

Luc Pattyn25-Jul-08 12:02

Luc Pattyn

25-Jul-08 12:02

Hi Gareth,

for powers of 2, don't use modulo, use bitwise AND instead. As in
if ((counter & 7)==0) doEveryEightTime();

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: How to check if a number can be dived by 8

Lutosław25-Jul-08 11:30

Lutosław

25-Jul-08 11:30

Gareth H wrote:

for (int i = 0; i < 64; i++)
{
    //doStuff

    if (i == 7 || i == 15 || i == 23 || i == 31 || i == 39 || i == 47 || i == 55)
    {
        //change int
    }                
}

So, does anyone know how I'd do a calculation to have the same effect as the above?

int counter = 0;
for (int i = 0; i < 64; i++, counter++)
{
    //doStuff

    if (counter == 7)
    {
        counter = -1;
        //change int
    }                
}

-OR- (additional maths needed but without an extra variable)

for (int i = 0; i < 64; i++)
{
    //doStuff

    if (i % 8 == 7)
    {
        //change int
    }                
}

Hope it helps Smile | :)

Greetings - Gajatko

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