Re: Multiple instance of startup form - C# Discussion Boards

Werdna2-Jul-04 15:06

2-Jul-04 15:06

I agree that putting values in enum is better, but if you work on a project with multiple people and have an enum without values, then next developer has no idea that you're using it as ints.

The solution I'm using now, is to store it as string and then use Enum.Parse to get the value back. I know it's quite a bit slower, but works better if enum is changing a lot.

Re: enum question

Colin Angus Mackay2-Jul-04 15:19

Colin Angus Mackay

2-Jul-04 15:19

Werdna wrote:
The solution I'm using now, is to store it as string and then use Enum.Parse to get the value back.

Eeuch! Sorry, but that is horrible.

Two things to mitigate this problem are:

1. Ensure the values are specified in advance. A good design should bing out most, if not all, the values you will need.

2. If it isn't known in advance [like the client changes their mind a lot, or you need to create space for future versions.] then space the numbers out - just like old fasioned programming languages where the line numbers would jump by 10 each time so you had space to add in additional code afterwards if needed.

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Re: enum question

Mikke_x3-Jul-04 0:33

Mikke_x

3-Jul-04 0:33

Yeah, I see what you mean. But I still can´t see the point of beeng able to declare an enum as:
enum ints :int {zero, one} if I can´t use it as constant int without convert. enum has always been an int in the background. If it is to be saved to file or something one should comment the code good enought so that the other people in the team knows not to change the order of the declarations. Or do them visible by:
enum ints { zero=0, one=1 } ; Then there should be no problem.

/ M

Re: enum question

Colin Angus Mackay3-Jul-04 12:08

Colin Angus Mackay

3-Jul-04 12:08

Mikke_x wrote:
Yeah, I see what you mean. But I still can´t see the point of beeng able to declare an enum as:
enum ints :int {zero, one} if I can´t use it as constant int without convert

The explicit cast is a safety mechanism - no matter how good your comments are you are not going to force someone to read them unless they have to. Most people muddle along all through their lives, programmers included. They only tend to look for something if they need to. The compiler forces them to need to.

The enum is there to say here is a type that can contain a set of possible values. If you want to assign it to an integer the compiler makes you explicity cast it to an integer (it probably does nothing when compiled - I've never checked the IL for that) because it is ensuring that you are fully aware that what you are doing is stripping off the protective layer that the enum is providing around the underlying int.

Datagrid Question

C#Coder672-Jul-04 5:42

C#Coder67

2-Jul-04 5:42

Hi all,

I have 3 columns being read and displayed in a dataGrid. I want to trap the event when the 2nd column comes to focus.

How do I do this?

Thanks
Confused | :confused:

Re: Datagrid Question

DougW482-Jul-04 6:57

DougW48

2-Jul-04 6:57

I usually get chastised for missing an important detail or simpler method everytime I give advice, but I still like to try. Big Grin | :-D

I would imagine your columns are just DataGridTextBoxColumns, since you didn't specify. Is there an event for when the grid gets focus, which you can simply see which cell has focus and determine if it's in the correct row? I'm too lazy to look myself. Cool | :cool:

If not, you could try making a new class which inherits the DataGridTextBoxColumn. In this class, you can have control of the textbox control which shows when a cell in the grid is activated. You can handle any events you want with the textbox. So, you can set the style of the grid so that the second column uses this new class, and the others just use the regular DataGridTextBoxColumn class.

Good luck, hope I helped.

Multiple instance of startup form

Anonymous2-Jul-04 4:09

Anonymous

2-Jul-04 4:09

Application Tools :Pocket PC 2003 , WINCE.NET , .NET CF , VC#

My startup form has 6 buttons ..each allowing user to jump to next screen.
Also every other screen returns to startup screen.

When I execute the application & navigate thru.
Every time i see a new instance of my startup form created at background.

i.e, when i leave my startup screen that particular instance doen't get closed/disposed.

My project requirements doesn't allow me to do FindWindow and DestroyWindow.

Could anyone suggest me why it is happenning and how to control it.

Thanks,
Ratna

Re: Multiple instance of startup form

Dave Kreskowiak2-Jul-04 4:57

Dave Kreskowiak

2-Jul-04 4:57

Anonymous wrote:
i.e, when i leave my startup screen that particular instance doen't get closed/disposed.

It better not get closed, otherwise your app will quit.

Anonymous wrote:
When I execute the application & navigate thru.
Every time i see a new instance of my startup form created at background.

Is this new instance being created by the new form you .Show()? Your new form show NOT be creating a new instance of your main form. Your new form show just close gracefully and control will return to the main form.

This is all speculation, of course, because we haven't seen any code that show's what your forms are doing when they get created and closed.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Multiple instance of startup form

Anonymous2-Jul-04 5:32

Anonymous

2-Jul-04 5:32

........................................
Application.Exit will quit my application.
Form.Close/Dispose will close all child windows and then close itself.

But why is it creating multiple instance.

When you are running application ... go to memory-running programs ..u will see all the instances of form running.

Thats were i detected this problem.

................................

Re: Multiple instance of startup form

Dave Kreskowiak2-Jul-04 5:50

Dave Kreskowiak

2-Jul-04 5:50

Anonymous wrote:
Application.Exit will quit my application.
Form.Close/Dispose will close all child windows and then close itself.
The end result is the same...

Anonymous wrote:
When you are running application ... go to memory-running programs ..u will see all the instances of form running.
I don't have a Pocket PC, or the development environment...

Like I said, we haven't seen any code, so we can't tell you wants going wrong. Also, questions related to Pocket PC are better handled in the Embedded/Mobile Forum.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Multiple instance of startup form

Andreas X3-Jul-04 22:01

Andreas X

3-Jul-04 22:01

Hi!
It is hard to tell by the information you have provided, but if i understand correct you run the first form as the main thread. Then you try to open several other forms from that form, and then close the first form.

But if you have made the first form the main thread, this will not close untill you end he program.

To avoyd the problem, try to not call the forms from the other form, have a background main thread that handles all forms.

Hope this make sence

regards

One port: multiple transfer

Gimpy19832-Jul-04 4:08

Gimpy1983

2-Jul-04 4:08

Hi there!

I'm doing a network application which send and receive files. Here's a quick description of the app:

1. It can receive files from multiple user at the same time.
2. A) When I want to receive from a different user I have to open another port.
B) I'm using sockets, that's reason for point "2. A)" :P

Now, I want to be able to receive multiple files from multiple users at the same time but with only one port. Like file sharing apps (Kazaa, eMule ,etc.) How can I do this?

Thanks a lot
Gimpy1983

----------------------
Be proud. Be yourself.

install project paths

mcgahanfl2-Jul-04 4:07

mcgahanfl

2-Jul-04 4:07

I added a new project of type 'setup wizard' for 'a windows application'. All the files in the resulting setup install into the same directory. How can I get the install to distribute files in the same directory structure as the 'Source Path'?

There is a folder property for each item to be installed, but it does not let me set and explicit path.

thansk

Please see this

saud_a_k2-Jul-04 1:31

saud_a_k

2-Jul-04 1:31

Please take time to see http://saudforyou.web1000.com/gridc.jpg
Please tell me how???

_____________________________________________________
Believe! Every thing has a purpose

Re: Please see this

Colin Angus Mackay2-Jul-04 2:10

Colin Angus Mackay

2-Jul-04 2:10

Tell you how what? I don't see anything - It just redirects to the home page.

Re: Please see this

saud_a_k2-Jul-04 2:48

saud_a_k

2-Jul-04 2:48

Oh.. cm'on.. It is there.. refresh the page..
ok It's the left colum in a datagrid I want to remove it.

_____________________________________________________
Believe! Every thing has a purpose

Re: Please see this

Gary Thom2-Jul-04 2:29

Gary Thom

2-Jul-04 2:29

Everything you wanted to know about DataGrid but were too afraid (ok you weren't) to ask.

http://www.syncfusion.com/FAQ/WinForms/FAQ_c44c.asp

Smile | :)

Gary

Re: Please see this

saud_a_k2-Jul-04 2:41

saud_a_k

2-Jul-04 2:41

thanx.. and I have asked a few questions on datagrid.. I will ask more..
That link is big!! It's sturday tomorrow.. I plan to watch spiderman2.
so.. push the FAQ onto monday!

_____________________________________________________
Believe! Every thing has a purpose

Using the same currency manager more than once

WillemM2-Jul-04 1:17

WillemM

2-Jul-04 1:17

I have created two forms:

One for the details, in which you can search on a particular field. If you right-click the field and click search, you get a form with a grid displaying the search results.

The second form uses the same dataset, with a dataview in front of it. So the forms are linked to the same datasource. But I want to synchronize them, so If I double-click a record in the grid I get the details of the record in the detail form.

How can I do this?

"Every rule in a world of bits and bytes can be bend or eventually be broken"

Re: Using the same currency manager more than once

Heath Stewart2-Jul-04 3:08

Heath Stewart

2-Jul-04 3:08

I wouldn't recommend sharing the CurrencyManager, which wouldn't work anyway since your binding contexts are technically different (one form binds to a DataSet while the other binds to a DataView, even though it is over a DataTable within the same DataSet - binding contexts must be exactly the same).

I would recommend using the event model. Define an event on one or both of the forms (depending on whether or not you want one-way or two-way synchronization) that when a button is clicked (or whatever you use for navigation), an event is also raised that the other form handles and increments it's CurrencyManager.Position as well. This also gives you a little more flexibility with future development.

Microsoft MVP, Visual C#
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Re: Using the same currency manager more than once

WillemM2-Jul-04 3:47

WillemM

2-Jul-04 3:47

Thanks for the info

"Every rule in a world of bits and bytes can be bend or eventually be broken"

How to Serialize object's property by its Category

nakey_yang2-Jul-04 1:06

nakey_yang

2-Jul-04 1:06

public class Test
{ private int num1; private int num2;
private int num3
[CategoryAttribute("BlackGround")]
public int Num1
{get{return num1;} set{num1=value;}}
[CategoryAttribute("BlackGround")]
public int Num2
{get{return num2;} set{num2=value;}}
[CategoryAttribute("ForeGround")]
public int Num3
{ get{return num3;} set{num3=value;} }}
How get the Serialization result as below?
<Test>
<BlackGround>
<Num1>..</Num1>
<Num2>..</Num2>
</BlackGround>
<ForeGround>
<Num3>..</Num3>
</ForeGround>
</Test>

ok

Re: How to Serialize object's property by its Category

Stefan Troschuetz2-Jul-04 1:19

Stefan Troschuetz

2-Jul-04 1:19

You want to post this every two hours? Show a bit patience!

If you just wanted to change your posting use the modify link instead of starting a new thread.

Re: How to Serialize object's property by its Category

nakey_yang2-Jul-04 1:53

nakey_yang

2-Jul-04 1:53

i know ,but i didn't know why this xml tag do disappear?

ok

Re: How to Serialize object's property by its Category [EDITED]

Stefan Troschuetz2-Jul-04 2:12

Stefan Troschuetz

2-Jul-04 2:12

Try to set the "Do not treat <'s as HTML tags" option which can be found below the text-control or use the HTML extended character codes.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.