Re: WinFrom help.... - C# Discussion Boards

Lev Danielyan11-Dec-08 23:57

11-Dec-08 23:57

Solution to what? If you get another appearance of you controls, change it back. If you are getting an error, please post it.

Regards,
Lev

Re: WinFrom help....

Tom Deketelaere11-Dec-08 23:53

Tom Deketelaere

11-Dec-08 23:53

Christian Graus wrote:
you should never modify that file. Apart from anything else, it's regenerated by the IDE, so you're wasting your time

Generaly I agree but sometimes you need to go into it to solve problems.
Also I frequantly use it to see how a control gets initialized and added.

Re: WinFrom help....

Lev Danielyan11-Dec-08 23:54

Lev Danielyan

11-Dec-08 23:54

Well, sometimes you're just forced to edit the _designer.cs (like making some changes without the studio Wink | ;)

) But of course you should really know what you are doing.

Regards,
Lev

Re: WinFrom help....

hotthoughtguy12-Dec-08 2:40

hotthoughtguy

12-Dec-08 2:40

as Lev said above,"sometimes you're just forced to edit the _designer.cs"

it means when ever i manually change my Designer.cs
i would not able to see my form view?

Re: WinFrom help....

Lev Danielyan12-Dec-08 2:58

Lev Danielyan

12-Dec-08 2:58

hotthoughtguy wrote:
it means when ever i manually change my Designer.cs
i would not able to see my form view?

Not exactly.
You see the designer generated code is being compiled on-the-fly when you open the design view. So, if you do some changes which won't compile (e.g. syntactic error and such), you'll end up with not working design view.

Let me say again, you should really know what you are doing, when modifying designer generated code.

Regards,
Lev

Re: WinFrom help....

#realJSOP12-Dec-08 0:01

#realJSOP

12-Dec-08 0:01

Christian Graus wrote:
it's regenerated by the IDE, so you're wasting your time

That's true, but I go in sometimes to change a component class to a non-system class, and the designer keeps it, even after regenerating (in fact, it fully qualifies the custom class with the namespace). Granted, you should avoid manually changing the file, it is possible to do.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Re: WinFrom help....

hotthoughtguy12-Dec-08 2:53

hotthoughtguy

12-Dec-08 2:53

ok thanks a lot Smile | :)

Re: WinFrom help....

DaveyM6912-Dec-08 4:56

DaveyM69

12-Dec-08 4:56

If you edit the xxx.Designer.cs file and the code isn't correct the designer can't display the form until the code is corrected.

Everytime you change something in the designer, this file gets rewritten so it's possible (but not certain) that your changes will get overwritten/erased. That's why it's called 'Desigener'.cs

If you need to make any changes of your own that can't be done in the designer, put them in the xxx.cs file or create a xxx.MyStuff.cs file and create another partial class (of the same name) in there, and call any methods from the xxx.cs before/after the InitializeComponent call as appropriate.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

How to convert ArrayList into String Array ?

Ravi Munde11-Dec-08 23:40

Ravi Munde

11-Dec-08 23:40

I am converting ArrayList to String Array in .NET 2.0 framework ...

string[] ControlButtons = (string[])controlList[i].ToArray(typeof(string));

but it through error 'object' does not contain a definition for 'ToArray' please give me solution to convert arraylist to string array

Thanks.

Re: How to convert ArrayList into String Array ?

Christian Graus11-Dec-08 23:46

Christian Graus

11-Dec-08 23:46

Did you try reading the error ? It doesn't know that the object is an arraylist, it only knows it's an object. So, you need to cast it.

((ArrayList)controlList[i]).ToArray

Why are you using Arraylist if you're using .NET 2.0 ? Use generic lists.

Christian Graus

Driven to the arms of OSX by Vista.

Re: How to convert ArrayList into String Array ?

Luc Pattyn11-Dec-08 23:47

Luc Pattyn

11-Dec-08 23:47

I'm not sure what it is you want to achieve but dropping the [i] turns that statement into something that compiles.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Fixturized forever. Confused | :confused:

Re: How to convert ArrayList into String Array ?

Lev Danielyan11-Dec-08 23:48

Lev Danielyan

11-Dec-08 23:48

This works fine for me:

ArrayList list = new ArrayList();
list.Add("a");
list.Add("b");
string[] arr = (string[])list.ToArray(typeof(string));

I guess you should do:

string[] ControlButtons = (string[])controlList.ToArray(typeof(string));

Smile | :)

Regards,
Lev

Byte Array Declaration

krinaljariwala11-Dec-08 23:18

krinaljariwala

11-Dec-08 23:18

Hello to all,
Here is my code:
client.HostToClient_Bytes(new CommsInfo_Bytes(Bytes));
[Serializable()]
public class CommsInfo_Bytes
{
private byte[] _Bytes;

public CommsInfo_Bytes(byte[] Bytes)
{
_Bytes = Bytes;
}
public byte[] Bytes
{
get { return _Bytes; }
set { _Bytes = value; }
}
}
when i am calling HostToclient_Bytes i am getting error say "Object refrence cannot be set as an instance of an object"
So will anybody helps me?
Thank you in advance.

Re: Byte Array Declaration

SeMartens11-Dec-08 23:27

SeMartens

11-Dec-08 23:27

Hi,

I'm just guessing but don't you need to declare a constructor without params if you want to serialize the object?

<br />
 public CommsInfo_Bytes() {<br />
 }<br />

Regards
Sebastian

It's not a bug, it's a feature!

Me in Softwareland.

Re: Byte Array Declaration

krinaljariwala11-Dec-08 23:34

krinaljariwala

11-Dec-08 23:34

hello,
I have done same implementation for messsage string passing in that i have not declare any empty construstor.
Thank you.

Re: Byte Array Declaration

krinaljariwala11-Dec-08 23:37

krinaljariwala

11-Dec-08 23:37

Hello,
But in string class i have declare as
private string _Message = "";
so any modification is needed in byte array declaration?

Re: Byte Array Declaration

SeMartens11-Dec-08 23:40

SeMartens

11-Dec-08 23:40

Normally this is not needed, but give it a try and set _Bytes = null;

Don't know if this is not the same, as everything is initialized with null...

It's not a bug, it's a feature!

Me in Softwareland.

Re: Byte Array Declaration

SeMartens11-Dec-08 23:39

SeMartens

11-Dec-08 23:39

Could you post the code of the method you call? (maybe the problem is within this method)

It's not a bug, it's a feature!

Me in Softwareland.

Re: Byte Array Declaration

Christian Graus11-Dec-08 23:40

Christian Graus

11-Dec-08 23:40

one would assume this means that client is null. Did you check in the debugger ?

Christian Graus

Driven to the arms of OSX by Vista.

Re: Byte Array Declaration

Mark Salsbery12-Dec-08 7:21

Mark Salsbery

12-Dec-08 7:21

Why not show the code with the error instead of a class that's (probably) not relevant? Smile | :)

Mark

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

Override virtual or abstracts with derived return types

jofli11-Dec-08 21:59

jofli

11-Dec-08 21:59

Hi all,
maybe someone can explain me, why this doesn't work in C#. Do i missed something, or is it a stupid idea to extend a return type of an override?

public class Class_a
    {
        Stream _something;

        public virtual Stream Property
        {
            get
            {
                return _something; 
            }
            set
            {
                _something = value; 
            }
        }
    }

    public class Class_b : Class_a
    {
        FileStream _something;
        
        public override FileStream Property
        {
            get
            {
                return _something;
            }
            set
            {
                _something = value;
            }
        }
    }

Thanks & Regards,
Johannes

Re: Override virtual or abstracts with derived return types

Rahul.RK11-Dec-08 22:12

Rahul.RK

11-Dec-08 22:12

Hello,

You are trying to override the property 'Property' in derived class and you are trying to change the return type of the property, which is not allowed in the C#. In C#.Net it is mandatory to keep the signature of method/property you want to override in the derived class.

Thanks,
Rahul Kulkarni

Re: Override virtual or abstracts with derived return types

jofli11-Dec-08 22:33

jofli

11-Dec-08 22:33

Hi Rahul,
thanks! I understand that i'm not allowed to change the return type. But i thought it should be allowed to extend it. So from the perspective of 'Class_a' the return type will always be "Stream". I know that i could use 'new' instead of 'override', but that wouldn't be the same and won't work with abstracts. This rule doesn't make sense to me.

regards,
Johannes

Re: Override virtual or abstracts with derived return types

J4amieC11-Dec-08 22:19

J4amieC

11-Dec-08 22:19

As explained, its not possible but its not such a stupid idea. Ive tried a similar thing once or twice and found frustration.

Re: Override virtual or abstracts with derived return types

jofli11-Dec-08 22:27

jofli

11-Dec-08 22:27

Have you found any elegant solution for this?

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