Re: Add variable to object reference - C# Discussion Boards

Re: excel

Giorgi Dalakishvili6-Aug-07 3:25

Giorgi Dalakishvili

6-Aug-07 3:25

You can use the OleDb Managed Data Provider to read an Excel Spreadsheet using ADO.NET and C#

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Re: excel

Bhavesh Bagadiya6-Aug-07 4:26

Bhavesh Bagadiya

6-Aug-07 4:26

You can use InterOp service provided by Microsoft using Excel namespace.

namespace for Excel is,

Microsoft.Office.Interop.Excel

Re: excel

\laddie6-Aug-07 4:29

\laddie

6-Aug-07 4:29

Hi Bhavesh,

Just a gentle suggestion.
This solution needs that you either assumes Office to be installed in the machine or you have to distubute the office libraries along with the Apps.

Please find my last post for this question it sould provide a better and faster solution.

laddie

Re: excel

\laddie6-Aug-07 4:27

\laddie

6-Aug-07 4:27

TAREQ

Try this

using System.Data.OleDb;
using System.Data;
.
.

//I am not sure giving url in the filename will work.Please check it

OleDbConnection oleConnection = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+fileName+@";Extended Properties=""Excel 8.0;HDR=YES""");

oleConenction.Open();

OleDbCommand cmd= new OleDbCommand("select * from [Sheet1$]",oleConnection);
OleDbDataReader read = cmd.ExecuteReader();

while(read.Read())
{
Console.WriteLine(read[0]+......);
}

Please let me know if it helps

Laddie
}

Add variable to object reference

Rick van Woudenberg6-Aug-07 2:30

Rick van Woudenberg

6-Aug-07 2:30

Dear all,

If I create a new reference to an object, I would like to add a variable to that newly create reference. Let's say :

Foo foo = new Foo();

Now, everythime the code runs, I would like a variable added to foo, let's say :

First time it is called :

Foo foo1 = new Foo();

Second :

Foo foo2 = new Foo();

Is there an easy way of doing this ?

Cheers,

Re: Add variable to object reference

Luc Pattyn6-Aug-07 2:52

Luc Pattyn

6-Aug-07 2:52

No.
What is the actual problem, why would you want this ?

Smile | :)

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Re: Add variable to object reference

Vasudevan Deepak Kumar6-Aug-07 3:24

Vasudevan Deepak Kumar

6-Aug-07 3:24

foo1 and foo2 are separate instances.

Vasudevan Deepak Kumar
Personal Homepage
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Re: Add variable to object reference

\laddie6-Aug-07 3:33

\laddie

6-Aug-07 3:33

Hi ,

I too wonder of the exact situation you would require to do that.If you can tell that we should be able to help you ourt more.

However calling the new on any object will be creating a new instance itself

eg:

Foo f;

for(int i=0;i<10;i++)
{
f= new Foo();
}

will create 10 new instances rather than 1 even though you are using the same variable name.

laddie

Re: Add variable to object reference

Colin Angus Mackay6-Aug-07 3:44

Colin Angus Mackay

6-Aug-07 3:44

Rick van Woudenberg wrote:
Is there an easy way of doing this ?

Sounds like you need an array or list

List<Foo> fooList = new List<Foo>();
fooList.Add(new Foo());

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Re: Add variable to object reference

Rick van Woudenberg6-Aug-07 4:04

Rick van Woudenberg

6-Aug-07 4:04

Thank you all for you swift reply.
Very true , new would create a new instance ( hence the name ). I can understand why this could be confusing. I will try to explain as good as I can why I would want this.

I create a new array of points, which I add to a ObjectList.

private void dataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)<br />
        {<br />
foreach (DataGridViewRow SelectedRow in dataGridView.SelectedRows)<br />
{<br />
Points pt = new Points();<br />
pt.AddPoint(X,Y);<br />
RenderableObjects.Objects.Add(pt);<br />
}<br />
}

When I rerender the form, the points (X,Y) show on the screen. So everytime I click on a row in the datagridview, the method is called. However, everytime a new instance of Points() is added to the RenderableObjects list. But before adding the new X and Y point , I want the list to be cleared. This can be achieved by :

RenderableObjects.Objects.Remove(pt);

However you can't use this line in the same method, since a new reference is initiated and therefore the previous pt is not removed.

My though was ( and it was just a though ) : If I could add a variable to the new reference, I could specifically filter, something like :

private void dataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)<br />
        {<br />
int x = 1;<br />
foreach (DataGridViewRow SelectedRow in dataGridView.SelectedRows)<br />
{<br />
points pt[x] = new Points();<br />
pt[x].AddPoint(X,Y);<br />
RenderableObjects.Objects.Add(pt[x]);<br />
int y = x -1 ;<br />
RenderableObjects.Objects.Remove(pt[y]);<br />
x++;<br />
}<br />
}

For obvious reasons , this code would not run 'cause you cannot use an array (x) size on a variable declaration. Like I said, it was just a thought. I hope I was able to clearify it a bit more.

Cheers

Problem about debuging

kcynic6-Aug-07 2:29

kcynic

6-Aug-07 2:29

I have a solution using a DCom component,but the component was written in VC,I also insert the source project to the solution.Someone would like to tell me how should I do to debug such program step by step?
Thanks

Re: Problem about debuging

MIHAI_MTZ6-Aug-07 4:12

MIHAI_MTZ

6-Aug-07 4:12

You didn't mention adding the project dependencies (right click main project/Add reference/ Choose VC project). You should now be able to step into unmanaged code. However, there are lots of strange behaviours (like functions which completly ignore return statements and so on) when debugging managed and unmanaged code in the same time.

Re: Problem about debuging

kcynic7-Aug-07 15:18

kcynic

7-Aug-07 15:18

Oh,it's sound fine.I will have a try immediately.
I also wish I can gain some advise here in future.
Thanks very much.

Re: Problem about debuging

kcynic7-Aug-07 19:10

kcynic

7-Aug-07 19:10

Sorry,I had follow your guide,but (right click main project/Add reference/ Choose VC project) have no such chioce,there is only a list of all the current projects of the solution. And it forbid me to add the VC project.
I have to insert the VC project to the solution,compile and run it.but when the COM objects's functions were called,it step over but no step in.

Get vs Post

_AnsHUMAN_ 6-Aug-07 2:29

_AnsHUMAN_

6-Aug-07 2:29

Hi All,
We have a web service(developed in C#) and currently we are using "GET" method for posting the data to the server.Now we want this to change and instead of using "GET" we should be able to use the "POST" method, using the following code we are using the "GET" method.
webRequest.Method = "Get"; where webRequest is System.Net.HttpWebRequest variable.
Could you please let us know if there would be changes required in the WebService to use "POST"?
Does "GET" method has a limitation in .NET for the amount of data to be sent?
Any link/article would be greatly helpful.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Database and XSLT

Prashant C6-Aug-07 2:12

Prashant C

6-Aug-07 2:12

Can we Query database in XSLT/XSL ?? or can we pass values to XSLT/XSL through C# or VB.Net ???

Thanks in advance.....

Re: Database and XSLT

lmoelleb6-Aug-07 7:40

lmoelleb

6-Aug-07 7:40

Look at XsltArgumentList. Use extension objects to provide methods to calculate or retreive external data (for example from a database) - use parameters to send data you already have into the XSLT.

When should i use ?? Timer vs Thread.Sleep(int);

Abdul Gafoor6-Aug-07 2:11

Abdul Gafoor

6-Aug-07 2:11

Hi,

When should i use ?? Timer vs Thread.Sleep(int);

could u please guide me with justification?

i believe that :
I can prefer Thread.Sleep(); if my execution has to be blocked for a specific amount time, and go for Timer if i have to execute a specific job after a period.

Is it like that???? Or
Anything else and more important is there?
please guide me..

Thanks

Re: When should i use ?? Timer vs Thread.Sleep(int);

Luc Pattyn6-Aug-07 2:18

Luc Pattyn

6-Aug-07 2:18

Hi,

it is slightly more complex:
- you can use timers to get a single activation in future, or a periodic activation;

- the timer fires its event on some thread; for a Windows.Forms.Timer that would be
the main or GUI thread; for other timers, it is a different thread (which is good since
it does not load the GUI thread, but it also makes you need Control.InvokeRequired
and Controle.Invoke() if the timer's handler needs to touch some Control).

- you can use Thread.Sleep() to put the current thread to sleep for some time, but only
if that is acceptable to the thread. It is probably OK to do it in a worker thread
or background thread, and not in the main thread (aka "GUI thread") since during the
sleep the entire GUI comes to a halt, so it would not repaint when uncovered, you would
not be able to resize it, etc etc.

So, if you have things to do on the GUi thread thar must be kept apart in time, you
have to organize that without Trhead.Sleep(); in that case a Windows.Forms.Timer is
the right choice.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: When should i use ?? Timer vs Thread.Sleep(int);

Pete O'Hanlon6-Aug-07 3:21

Pete O'Hanlon

6-Aug-07 3:21

Not fair. I wanted to answer this one;P. Good answer though.

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

Re: When should i use ?? Timer vs Thread.Sleep(int);

Malcolm Smart6-Aug-07 3:27

Malcolm Smart

6-Aug-07 3:27

You answered like this because it seems you have no idea about the subject. Laugh | :laugh:

"More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF

Re: When should i use ?? Timer vs Thread.Sleep(int);

Pete O'Hanlon6-Aug-07 3:34

Pete O'Hanlon

6-Aug-07 3:34

Yup - that's me. I'm the ultimate expert. I know nothing about everything. Laugh | :laugh:

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

Re: When should i use ?? Timer vs Thread.Sleep(int);

Luc Pattyn6-Aug-07 3:54

Luc Pattyn

6-Aug-07 3:54

Pete O`Hanlon wrote:
I know nothing about everything

Then why is it I have seen questions you did not answer ?

Luc Pattyn [Forum Guidelines] [My Articles]

Re: When should i use ?? Timer vs Thread.Sleep(int);

Pete O'Hanlon6-Aug-07 4:01

Pete O'Hanlon

6-Aug-07 4:01

I like to spread my ignorance thinly.

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

TreeView StateImageList StateImageIndex

Abisodun6-Aug-07 2:00

Abisodun

6-Aug-07 2:00

Is there a max value for treeNode.StateImageIndex?

I have a stateImageList with 21 images. Any image above the 15th e.g. treeNode.StateImageIndex = 15, generates an ArgumentOutOfRangeException with message:

InvalidArgument=Value of '15' is not valid for 'StateImageIndex'

A max value isn't documented as far as I see. What am I missing?

Thanks

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