Virtual method in sealed class - C# Discussion Boards

Re: one more c# xml issue

PIEBALDconsult5-Aug-09 9:00

PIEBALDconsult

5-Aug-09 9:00

You'll have to write some code.

Re: one more c# xml issue

Not Active5-Aug-09 9:10

Not Active

5-Aug-09 9:10

How insightful

only two letters away from being an asset

Re: one more c# xml issue

0x3c05-Aug-09 9:05

0x3c0

5-Aug-09 9:05

Yes; look into XPath queries. The correct query would be something along the lines of "//xml/person[id='2']". You simply have to plug that into and example like this; there are other examples you could use as well

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Re: one more c# xml issue

Not Active5-Aug-09 9:08

Not Active

5-Aug-09 9:08

You can use an XPath expression to retrieve the xml fragment, ./person[@id='2'] will return the second person element in this case

only two letters away from being an asset

Re: one more c# xml issue

laziale5-Aug-09 9:47

laziale

5-Aug-09 9:47

ok, sorry everyone cause I didn't provide any code, but here is what I tried:

     string innerXml = "";
innerXml = docCompany.Attributes[selectedItem].OuterXml;

and it give me an error NullReferenceObject

any other way?

Re: one more c# xml issue

Not Active5-Aug-09 10:46

Not Active

5-Aug-09 10:46

As we have been telling you, use an xpath query http://msdn.microsoft.com/en-us/library/hcebdtae.aspx[^]

only two letters away from being an asset

Re: one more c# xml issue

Adam R Harris5-Aug-09 13:46

Adam R Harris

5-Aug-09 13:46

You should look into LINQ for this, I absolutely LOVE LINQ when working with XML files.
http://www.codeproject.com/KB/linq/LinQ_To_Xml.aspx

That's a good article that shows pretty much exactly how to do what you need.

Sorry for the crappy link, all the fancy JavaScript that formats it doesn't work on my iPhone (stupid safari)

If at first you don't succeed ... post it on The Code Project and Pray.

Virtual method in sealed class

jpk4205-Aug-09 7:50

jpk420

5-Aug-09 7:50

Hello ,

Virtual keyword allows us to override that method in child class.

Now when we declare a class as sealed class then we cant inherit . In That case why it allows us to decalre virtual keyword in static class when any other class inherit it ?

Pls expaln in deatils

Regards,
Jaddu

Re: Virtual method in sealed class

N a v a n e e t h5-Aug-09 9:03

N a v a n e e t h

5-Aug-09 9:03

It will not allow you to declare a virtual method in a sealed class. You can't have instance members in a static class as well.

Smile | :)

Navaneeth

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Re: Virtual method in sealed class

PIEBALDconsult5-Aug-09 9:04

PIEBALDconsult

5-Aug-09 9:04

You can't, what makes you think you can?

Re: Virtual method in sealed class

DaveyM695-Aug-09 12:21

DaveyM69

5-Aug-09 12:21

You can't. Have you tried it?
In a static class, if you try to create a virtual method the compiler will spit at you with
A static member cannot be marked as override, virtual, or abstract
In a sealed class
... is a new virtual member in sealed class ...

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)
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Regex issue

Imtiaz Murtaza5-Aug-09 7:43

Imtiaz Murtaza

5-Aug-09 7:43

Hey guys,
Can anyone help me in writing the simple regex. Here is the situation:

I have a text file something like:

// Contents
// Contents
MyDataBlock
{
   @$
      The datablock text
   @$
}
// Contents
// Contents

I want to extract "The datablock text". There is single "MyDataBlock" in this text file. It means that i have to extract entire MyDataBlock {...} and then what is inside @$ into a regex group.

I've created a regex. It is successfully extracting following in regex group <b>DataBlockContents</b>:

   @$
      The datablock text
   @$

But i don't want @$ in the regex group DataBlockContents. How can i do so ? The regex i created is:

MyDataBlock[\\w\\s]*{(?<DataBlockContents>[^}]*)}

Imtiaz

Re: Regex issue

PIEBALDconsult5-Aug-09 9:09

PIEBALDconsult

5-Aug-09 9:09

The same way you don't get the { and } in the group?

Do you have control over how the file is formatted? Why use @$ instead of something else?

At runtime find the application's build version?

JollyMansArt5-Aug-09 7:10

JollyMansArt

5-Aug-09 7:10

Is it possible to pull from somewhere after the application has been compiled to know what it's build version number is so I can show it in a label? I am thinking I can pull if from the assembly but my attempts have failed. Please can someone point me in the right direction?

Here is what I am currently doing and it does not match the build version of the application that I am compiling.

lblAppVersion.Text = "Version: " + System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString() + " or " + System.Reflection.Assembly.GetCallingAssembly().GetName().Version.ToString();

Re: At runtime find the application's build version?

ricmil425-Aug-09 11:27

ricmil42

5-Aug-09 11:27

Are you looking for something like this?

labelControlVersion.Text = string.Format ( "Version: {0}", Assembly.GetExecutingAssembly ( ).GetName ( ).Version ) ;

Re: At runtime find the application's build version?

JollyMansArt5-Aug-09 15:47

JollyMansArt

5-Aug-09 15:47

Not quite I want the applications build version... which would show on the project properties screen under the publish tab.
any idea where this is?

Re: At runtime find the application's build version?

Dougie the P5-Aug-09 16:03

Dougie the P

5-Aug-09 16:03

What do you want the text in the label to look like?

To Get This "Ver. 5.1.2 Rev. 3"

Try like this;

Dim avi As System.Version = System.Reflection.Assembly.GetExecutingAssembly.GetName.Version
lblVersion.Text = "Ver. " & Format(avi.Major, "###0").TrimEnd & "." _
& Format(avi.Minor, "###0").TrimEnd & "." & Format(avi.Build, "###0").TrimEnd _
& " Rev. " & Format(avi.Revision, "###0")

Of course this is not the publish version (just saw last post)

Re: At runtime find the application's build version?

Cracked-Down5-Aug-09 19:41

Cracked-Down

5-Aug-09 19:41

it is very easy tog et this info
This is a code for this

//get the version from the assemblyinfo.cs
// Version information for an assembly consists of the following four values:
            //
            //      Major Version
            //      Minor Version 
            //      Build Number
            //      Revision
            //
            Version v = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
           //add to label
 lblVersion.Text = v.ToString();

This information is stored in the AssemblyInfo.cs under Node 'Properties' in Solution explorer!

Smile | :)

Reg,
Deep
Happy Coding!

Re: At runtime find the application's build version?

JollyMansArt5-Aug-09 20:59

JollyMansArt

5-Aug-09 20:59

Thanks I learned that c# does not auto increment the version per each build. That was the issue I was having.

Change Headers in DataGridView [modified]

petermar5-Aug-09 6:01

petermar

5-Aug-09 6:01

I am having a problem changing the forecolor of a DataGridView header. I have tried the following code:

dgvMaintenance.EnableHeadersVisualStyles = false;
DataGridViewCellStyle dgvcs = dgvMaintenance.ColumnHeadersDefaultCellStyle;
dgvcs.BackColor = System.Drawing.Color.DarkGray;
dgvcs.ForeColor = System.Drawing.Color.White;

The backcolor changes, but the forecolor does not.

I have also tried:

dgvMaintenance.EnableHeadersVisualStyles = false;
DataGridViewCellStyle dgvcs = new DataGridViewCellStyle();
dgvcs.BackColor = System.Drawing.Color.DarkGray;
dgvcs.ForeColor = System.Drawing.Color.White;
dgvMaintenance.ColumnHeadersDefaultCellStyle = dgvcs;

with the same results. I have also added code to change the font and that works too.

What am I doing incorrectly? Thank you for any help.

modified on Wednesday, August 5, 2009 12:26 PM

checking a string format?

will kirkby5-Aug-09 5:53

will kirkby

5-Aug-09 5:53

i need to check that the content in a textbox is a 6-digit hexadecimal number (or rather, an HTML color code).

How do I do this?

Re: checking a string format?

Simon P Stevens5-Aug-09 5:59

Simon P Stevens

5-Aug-09 5:59

You could use a regular expression.

There's a bunch of regular expression classes in .net (Start here[^]

If you don't know about regular expressions, you might want to read up a bit on them. There's a site here[^] that's worth looking at.

It's also worth having a tool to test them with before you start coding them. A popular one is Expresso[^].

Simon

Re: checking a string format?

musefan5-Aug-09 7:03

musefan

5-Aug-09 7:03

use this function...

bool ValidateColor(string s)
{
   if(s.Length != 6)//wrong length
     return false;
   for(int i = 0; i < 6; i++)
   {
     int c = (int)s[i];
     if(!(c > 47 && c < 58) || !(c > 64 && c < 71))
       return false;
   }
   return true;
}

..should do the job

Life goes very fast. Tomorrow, today is already yesterday.

Re: checking a string format?

Luc Pattyn5-Aug-09 8:14

Luc Pattyn

5-Aug-09 8:14

That is terrible. I see magic constants, a major bug (|| instead of &&) and no acceptance of lower-case hex.

I would suggest:

public static bool ValidateColor(string s, out int value) {
    return s!=null && s.Length==6 && int.TryParse(s, out value, NumberStyles.HexNumber);
}

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Re: checking a string format?

musefan5-Aug-09 21:53

musefan

5-Aug-09 21:53

Yeah, my bad... I wanted to use the parse method but couldn't remember the param for the the NumberStyles bit...

Plus I knew you be around to set me straight Wink | ;)

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