C# Discussion Boards - CodeProject

Re: c#

Pete O'Hanlon11-Oct-07 11:30

Pete O'Hanlon

11-Oct-07 11:30

MasterSharp wrote:
So much negativity...

Come on. Feel the love. Laugh | :laugh:

Deja View - the feeling that you've seen this post before.

Re: c#

GuyThiebaut11-Oct-07 8:14

GuyThiebaut

11-Oct-07 8:14

POS means "Point of Sale" doesn't it?

So I guess what you are asking is for help in creating an electronic cashtill.
If this is the case I'd suggest you start off by designing a simple calculator and take it from there.

That is assuming I've understood what you mean by POS.

You always pass failure on the way to success.

Well

Ennis Ray Lynch, Jr.11-Oct-07 8:55

Ennis Ray Lynch, Jr.

11-Oct-07 8:55

I have been know to develop such systems :p

Actually, your best bet is to purchase Quick Books or some other cots and then use its extensibility model.

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Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway

hiding option

netJP12L11-Oct-07 3:49

netJP12L

11-Oct-07 3:49

I want to hide the + or - sign in the PropertyGrid. For instance, if there are 1 main root level and has 2 child roots levels I only want to display everything expanded but again without having the options to click to minimize or maximize.

MainFolder
|
|
|_____
|
|SubFolder1
|
|SubFolder2

Thanks

Re: hiding option

TJoe11-Oct-07 3:51

TJoe

11-Oct-07 3:51

That's not something the PropertyGrid control allows you to suppress.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Re: hiding option

Pete O'Hanlon11-Oct-07 11:48

Pete O'Hanlon

11-Oct-07 11:48

In order to do this, you'd have to take over drawing the property grid yourself. It seems like a lot of effort for not really much gain.

Deja View - the feeling that you've seen this post before.

interface implimentation in Excel

A M SOMAN11-Oct-07 3:12

A M SOMAN

11-Oct-07 3:12

Hi,

Today I opened the definition of Excel.ApplicationClass and I observed that it implements two interfaces called application and _application. Interface _application contains lot of members but interface application is empty and only implements interface _application. So the hierarchy is like this;

interface _application (interface with members in it)
interface application (empty interface) : _application
ApplicationClass (class) : _application, application

So the class ApplicationClass provides definitions to all members in topmost interface _application. My question is that why does this class need to implement the interface _application if it is already implemented by interface application?

Thanks in advance for all the answers by you.

Anil

Re: interface implimentation in Excel

Pete O'Hanlon11-Oct-07 11:26

Pete O'Hanlon

11-Oct-07 11:26

A M SOMAN wrote:
My question is that why does this class need to implement the interface _application if it is already implemented by interface application?

Good question. I would expect that the answer is because it's autogenerated so don't actually expect it to do anything clever there.

Deja View - the feeling that you've seen this post before.

What it mean when a class contructor accepts same class object ?

N a v a n e e t h11-Oct-07 3:05

N a v a n e e t h

11-Oct-07 3:05

Assume I have class1.

class class1
{
   public class1(class1 c1)
   {
   }
}

What this means ? Why a class needs another instance of the same class to be passed as parameter. I have seen this type of behavior in XmlSerializerNamespaces[^] class. It accepts XmlSerializerNamespaces object in the constructor ? Confused | :confused:

Any idea ?

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Re: What it mean when a class contructor accepts same class object ?

TJoe11-Oct-07 3:12

TJoe

11-Oct-07 3:12

This is called a copy constructor[^]. It is used to create a copy of the given object. In .Net, the class should really implement ICloneable[^] though.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Re: What it mean when a class contructor accepts same class object ?

N a v a n e e t h11-Oct-07 3:19

N a v a n e e t h

11-Oct-07 3:19

That's new to me. Do you have any c# links explaining this ? Why we use this ? I found that it is making a copy of object, so how parameters are passed to constructor ?

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Re: What it mean when a class contructor accepts same class object ?

TJoe11-Oct-07 3:22

TJoe

11-Oct-07 3:22

The link I provided is for C++, but the same concept applies to C#.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Re: What it mean when a class contructor accepts same class object ?

Ennis Ray Lynch, Jr.11-Oct-07 3:20

Ennis Ray Lynch, Jr.

11-Oct-07 3:20

And yet is still isn't generic

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Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway

Re: What it mean when a class contructor accepts same class object ?

DavidNohejl11-Oct-07 3:24

DavidNohejl

11-Oct-07 3:24

TJoe wrote:
In .Net, the class should really implement ICloneable

Not so quick, read Community Content down there Smile | :)

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Re: What it mean when a class contructor accepts same class object ?

TJoe11-Oct-07 3:30

TJoe

11-Oct-07 3:30

I did and I doubt Jonathan speaks for Microsoft. I agree with wekempf's last post. Copy constructor does specify whether it's a deep or shallow copy either. In addition, the ICloneable allows derived classes to more easily override the copy behavior. Finally, there is no way (aside from reflection) to tell if an object has a copy constructor. With the ICloneable interface, you can easy do "if (obj is ICloneable)".

-- Update: I see now that the MS guidelines recommend to not use it. But there are still applications for this interface.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Re: What it mean when a class contructor accepts same class object ?

DavidNohejl11-Oct-07 3:56

DavidNohejl

11-Oct-07 3:56

I'm not going to join debate about copy ctor vs ICloneable now Smile | :)

However I wanted to point out there is a debate.

TJoe wrote:
-- Update: I see now that the MS guidelines recommend to not use it.

This is where I first saw that Smile | :)

Re: What it mean when a class contructor accepts same class object ?

DavidNohejl11-Oct-07 3:21

DavidNohejl

11-Oct-07 3:21

N a v a n e e t h wrote:
Why a class needs another instance of the same class to be passed as parameter.

You can use this pattern when you want to inicalize your instance using copy of data from another instance.

If you look at XmlSerializerNamespaces with Reflector, you see:

public XmlSerializerNamespaces(XmlSerializerNamespaces namespaces)
{
    this.namespaces = null;
    this.namespaces = (Hashtable) namespaces.Namespaces.Clone();
}

Re: What it mean when a class contructor accepts same class object ?

N a v a n e e t h11-Oct-07 3:25

N a v a n e e t h

11-Oct-07 3:25

Yes that made it clear. Thanks

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UI Controls which generate screens at runtime

NicoJS11-Oct-07 2:50

NicoJS

11-Oct-07 2:50

For data / transactional apps such as LOB, we all want the user to view and update an object (which is usually OR mapped to a datastore) or a list of objects.

I am looking for a UI control which generates a screen at runtime based on the properties AND methods of an object. The PropertyGrid of the ComponentModel does a wonderful job but I cannot present that to users.
Also, its Reflection/Attribute driven model means the end-users cannot influence many of the display characteristics. I am fully prepared to implement an interface which the UI control imposes on me.
Such an interface can request the properties to display, the order, the category, which are updateable, default values, help, and whatever other wonderful things the UI control can do with the info it gets from the interface.
It can also ask me to save any changes the user made (which is limited to the UI type of properties such as position, size, order, etc), so the user can customize his display.

ITypedList (which is used by most grids) is a good example with its GetItemProperties method, why can't PropertyGrid also use such a method iso Attributes ?

But displaying and maintaining properties is only the beginning. Why not include methods, which are then displayed as buttons (or context menus or some other wonderful thing). When the user
clicks on a button, the UI requests values for each parameter from the user (but only after requesting defaults, allowed values, help, etc for each parameter from the implementor of the interface).

This way, Reflection/Attributes represents only one of many ways to influence the UI. I can implement the interface such that the info is called from some config file or metadata database.

Is there something like that or am I missing something ?

Re: UI Controls which generate screens at runtime

visualhint11-Oct-07 9:07

visualhint

11-Oct-07 9:07

Hello Nico,

sorry for the plug, but you seem to like the PropertyGrid but at the same time you regret it's not flexible enough at runtime. Did you try Smart PropertyGrid? It has been developed from scratch for flexibility and usability (this one, you can present it to your users)...

Let me know in the visualhint helpdesk if you have any question.

Best regards,

Nicolas Cadilhac @ VisualHint
Smart PropertyGrid.Net
Microsoft PropertyGrid Resource List
Free PropertyGrid for MFC
Smart FieldPackEditor.Net / DateTimePicker

c# ToolStripMenuItem Visible propert

ATCsharp11-Oct-07 2:32

ATCsharp

11-Oct-07 2:32

I am running into a weird situation right now. I have a UserControl that contains a MenuStrip. I want to hide certain items depending on the access level of the current user. When I set the top level menu item's Visible property to false...nothing happens and the item is still visible.

There are no references to any of the items anywhere else in the code so I am 100% sure that its not getting set back. If I set the Visible property to false via the designer...it works. Anyone ever encounter this or know whats going on??

Re: c# ToolStripMenuItem Visible propert

VirtualVoid.NET12-Oct-07 2:10

VirtualVoid.NET

12-Oct-07 2:10

In designer it's working?! Unsure | :~

Hmm and are you sure, if all of the controls on the menustrip should have Visible property = false ? [Menustrip have Controls property, which is collection of controls placed on that strip].

V^irtualV^oid.NET

[Message Deleted]

Rinki Mukheraji11-Oct-07 1:51

Rinki Mukheraji

11-Oct-07 1:51

[Message Deleted]

Re: GridView

Spunky Coder11-Oct-07 1:55

Spunky Coder

11-Oct-07 1:55