Re: Custom Collections - C# Discussion Boards

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Re: Regex.Replace hangs !!!

S. Senthil Kumar1-Nov-05 18:08

S. Senthil Kumar

1-Nov-05 18:08

Can you give an example of a string that causes the regex to hang?

Regards
Senthil
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Re: Regex.Replace hangs !!!

whizzs2-Nov-05 10:29

whizzs

2-Nov-05 10:29

Not it is a big deal, but I would clean the code up a bit by using non-capturing groups for the [quote] and [/quote] because you just want to see if they are there, but don't need them. So the regex string would be:

@"(?:\[quote\])(?<quo_text>.*)(?:\[/quote\])"

if ( m.success )
{
return "####"+m.Groups["quo_text"].Value+"###";
}

then I would change the if statement to a while loop in case the user has more than 1 quote block in a line

string [] s = new string[];
int i = 0;
while ( m.success )
{
s [i] = "####"+m.Groups["quo_text"].Value+"###";
m.NextMatch();
}
return s;

But please send an example of the string that causes it to hang

Re: Regex.Replace hangs !!!

whizzs2-Nov-05 10:32

whizzs

2-Nov-05 10:32

my reg ex string did not post correctly it should be
@"(?:\[quote\])(?<quo_text>.*)(?:\[/quote\])"

How to Retrieve Serial Ports and Parallel Ports in the current system by Using Visual C#

sums081-Nov-05 10:26

sums08

1-Nov-05 10:26

I am trying to get the list of Serial ports available in windows system.

Appreciate, if you could lead me to some API's available in C# to retrive the existing ports in the system.

Thnx
SRB

Re: How to Retrieve Serial Ports and Parallel Ports in the current system by Using Visual C#

whizzs2-Nov-05 10:49

whizzs

2-Nov-05 10:49

Here's one:

http://msdn.microsoft.com/msdnmag/issues/02/10/NETSerialComm/default.aspx

Or you can get the .NET framework 2.0 (beta) and use the System.IO.Ports namespace which has everything you need bundled in one managed assembly

Re: How to Retrieve Serial Ports and Parallel Ports in the current system by Using Visual C#

sums083-Nov-05 5:35

sums08

3-Nov-05 5:35

Thanks a bunch whizzs.

I am working on .NET 1.1, so the customized version of this code works for me.

cool

Custom Collections

tsramkumar1-Nov-05 10:06

tsramkumar

1-Nov-05 10:06

Hi I have used one of the typed collection generator tools available for generating type safe .Net collection for my custom object (for example, say customer) . However, I had a question with the Indexof and Contains method. How is it normally implemented? If I pass in a customer object to the contains method or the Indexof method, then for it to function properly, do I need to override the ToString() method for the Customer object so that it returns the key of that object?
Any help is appreciated?
Thanks

Re: Custom Collections

S. Senthil Kumar1-Nov-05 18:18

S. Senthil Kumar

1-Nov-05 18:18

tsramkumar wrote:
Indexof and Contains

IIRC, both of them use Equals[^] method to determine equality. The default implementation of Equals in System.Object checks if both references refer to the same object, you might want to override it to define equality in whatever way you want.

If you override Equals, it's recommended to override GetHashCode also, as per this[^] recommendation.

For example,

class Customer
{
   int id;
   public override bool Equals(object obj)
   {
      if (obj == null) return false;

      Customer b = obj as Customer;
      
       if ((object)b == null) return false;

      return this.id == b.id;
   }
   
   public override int GetHashCode()
   {
      return id; //assuming id is unique.
   }
}

Regards
Senthil
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Re: Custom Collections

tsramkumar2-Nov-05 3:06

tsramkumar

2-Nov-05 3:06

Thanks Senthil, that really helps. Btw, if the unique identifier of my custom object is a string (alphanumeric) rather than an int, I cannot override the GetHashCode method right? Can you give me the reason behind your recommendation for overriding this method and where it will be used?
Btw, I got around with this by making the custom object implement the IComprable interface and implement the compareto method which would compare the identifiers adn return if they are equal or not. I am wondering if this is something that is not normally done in this scenario?

Thanks.

Re: Custom Collections

S. Senthil Kumar2-Nov-05 4:37

S. Senthil Kumar

2-Nov-05 4:37

tsramkumar wrote:
Can you give me the reason behind your recommendation for overriding this method and where it will be used?

This will be used when you put your custom objects into a Hashtable, or in any associative container. You'd expect to get the same Customer, provided the id is the same, regardless of whether they are two different instances. What I mean is

Hashtable h = new Hashtable();
Customer c1 = new Customer(1);
h[c1] = "Senthil";
...
Customer c2 = new Customer(1);
Console.WriteLine((string)h[c2]);

Users of your class would expect "Senthil", right?

tsramkumar wrote:
Btw, I got around with this by making the custom object implement the IComprable interface

I'm not sure if implementing IComparable is enough, does your code work correctly for standard .NET collections like ArrayList?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Rigid body transformation parameters

pxp1-Nov-05 9:54

pxp

1-Nov-05 9:54

For a certain project i need to find the translation and rotation parameters between 2 'almost identical' paired-coordinate arrays.

The source coordinates need to be transformed to the target coordinates, therefore the translation and rotation parameters should be determined.

The Horn alghoritm is one, but i could not find any code regarding this.

Anyone has some info regarding the determination of rigid body transformation parameters?

Thanks,

Jan

Another Dynamic Button Question

TheMajorRager1-Nov-05 9:47

TheMajorRager

1-Nov-05 9:47

I got my dynamic buttons to work now, however, when the user clicks the button, I want a message to show up saying which button was clicked. Whether it was the first, second, third, etc. however, when I click any button, it just says it was the last button created. Let's say I have three buttons, if I click Button_1 it will still say Button_3 was clicked. Here is what my function looks like.

<br />
<br />
protected void GenericButton_Click(object sender, System.EventArgs e)<br />
	{<br />
<br />
		//string l = "";<br />
<br />
		//passedin = the text in the textbox<br />
		string iden = "";<br />
		string passedin = "";<br />
		iden = GenericButton.ID;<br />
		//iden should have the name of the button that was clicked<br />
<br />
		<br />
	}<br />

Re: Another Dynamic Button Question

Wjousts1-Nov-05 10:45

Wjousts

1-Nov-05 10:45

Where does GenericButton come from?
What you should do is take sender and cast it back to a button:

<br />
Button TheButtonThatWasClicked = (Button) Sender;<br />

Then you can access all the properties of that button:

<br />
string name = TheButtonThatWasClicked.Name;<br />
string text = TheButtonThatWasClicked.Text;<br />
object tag = TheButtonThatWasClicked.Tag;<br />

I included Tag there because tag is a handy property of certain controls that you can use to store any object you want and be able to retrieve it later.

Loop Through XML File

Stephen McAllister1-Nov-05 9:34

Stephen McAllister

1-Nov-05 9:34

Hi,

I would like to loop through the following XML file to fill a combobox with the client name value. Does anyone know how to do this and where is an example?

FTP
Client>
Client_Name xmlns="Default1" /
/Client
Client
Client_Name xmlns="Default2" /
/Client
/FTP

Thanks in advance.

Stephen

-- modified at 15:36 Tuesday 1st November, 2005

Re: Loop Through XML File

MalikRizwan1-Nov-05 18:30

MalikRizwan

1-Nov-05 18:30

Create a DataSet Object and then

<br />
 ds.readXml("Path");<br />
 for (int i=0;i < ds.tables(0).rows.count;i++)<br />
   {<br />
     cmbClientName.Items.Add(ds.Tables(0).Rows(i).Items("[Client Name]")<br />
                 //ds.Tables(0).Rows(i)("[Client Name])<br />
   }<br />

Regards

Rizwan Ahmed Malik Sleepy | :zzz:

R A M

-- modified at 0:31 Wednesday 2nd November, 2005

Re: Loop Through XML File

S. Senthil Kumar1-Nov-05 18:43

S. Senthil Kumar

1-Nov-05 18:43

Did you take a look at the Select[^] method?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Get a column HeaderText

zaboboa1-Nov-05 9:32

zaboboa

1-Nov-05 9:32

Hello,

I have:

<br />
foreach(DataColumn col in this.dataview.Table.Columns) {   <br />
ColumnIndex++;<br />
 .<br />
 .<br />
 .				<br />
} <br />

Is there a way of getting the col HeaderText (not col.ColumnName) within this foreach statement?

Thank you.

Re: Get a column HeaderText

Wjousts1-Nov-05 10:51

Wjousts

1-Nov-05 10:51

DataColumn doesn't have a HeaderText property. What you are probably looking for is the HeaderText of a DataGridColumnStyle. Try something this:

<br />
foreach(DataGridColumnStyle dgcs in MyDataGrid.TableStyles["MyTable"].GridColumnStyles)<br />
{<br />
string headertext = dgcs.HeaderText;<br />
.<br />
.<br />
.<br />
}<br />

-- modified at 16:51 Tuesday 1st November, 2005

[Message Deleted]

Stephen McAllister1-Nov-05 9:31

Stephen McAllister

1-Nov-05 9:31

[Message Deleted]

Sort Array by Date properly

Joshua Lunsford1-Nov-05 8:13

Joshua Lunsford

1-Nov-05 8:13

I'm trying to find the straight forward way to sort a single array of dates.
string[] datearray = new string[10]
here is a sample...
i want this:
12/27/2005
12/28/2005
01/01/2006
01/02/2006
01/04/2006
01/05/2006
12/29/2005
12/30/2005
12/31/2005
01/03/2006

to look at this:
12/27/2005
12/28/2005
12/29/2005
12/30/2005
12/31/2005
01/01/2006
01/02/2006
01/03/2006
01/04/2006
01/05/2006

any clues?

Re: Sort Array by Date properly

Jon Sagara1-Nov-05 8:17

Jon Sagara

1-Nov-05 8:17

Why are you storing them as strings instead of DateTimes?

Jon Sagara
Look at him. He runs like a Welshman. Doesn't he run like a Welshman? Doesn't he? I think he runs like a Welshman.
Sagara.org | Blog | My Articles

Re: Sort Array by Date properly

Joshua Lunsford1-Nov-05 8:23

Joshua Lunsford

1-Nov-05 8:23

thats all you needed to say... i fixed it. I needed the output in string format so i had a brain fart and started converting it early... thanks

File information

KaptinKrunch1-Nov-05 6:57

KaptinKrunch

1-Nov-05 6:57

I'm looking to access some file properties such as the Author and comments. Where is this information stored? Is there a .Net class that allows access?

Re: File information

Dan Neely1-Nov-05 7:09

Dan Neely

1-Nov-05 7:09

Have you tried hte FileInfo Class?

Re: File information

KaptinKrunch1-Nov-05 7:30

KaptinKrunch

1-Nov-05 7:30

I have but it does not expose the information that I'm looking for.
For example if you right click a file choose properties then choose the summary tab. The information that might be present here is what I'm after.

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