&quot;obj&quot; folder is used to store temporary object files and other files used to create the final binary.

Further reading [here][1]


  [1]: http://social.msdn.microsoft.com/Forums/en-US/csharpide/thread/456ebb0e-6fa3-4a77-a723-6984c5208562/

I have a [URL][1], and I&#39;m trying to match it to a regular expression to pull out some groups. The problem I&#39;m having is that the URL can either end _or_ continue with a &quot;/&quot; and more URL text. I&#39;d like to match URLs like this:

- http://server/xyz/2008-10-08-4
- http://server/xyz/2008-10-08-4/
- http://server/xyz/2008-10-08-4/123/more

But not match something like this:

- http://server/xyz/2008-10-08-4-1

So, I thought my best bet was something like this:  

    /(.+)/(\d{4}-\d{2}-\d{2})-(\d+)[/$]

where the character class at the end contained either the &quot;/&quot; or the end-of-line. The character class doesn&#39;t seem to be happy with the &quot;$&quot; in there though. How can I best discriminate between these URLs while still pulling back the correct groups?

  [1]: http://en.wikipedia.org/wiki/Uniform_resource_locator


Regex to match URL end-of-line or &quot;/&quot; character

Is there an elegant way to have performant, natural sorting in a MySQL database?

For example if I have this data set:

* Final Fantasy
* Final Fantasy 4
* Final Fantasy 10
* Final Fantasy 12
* Final Fantasy 12: Chains of Promathia
* Final Fantasy Adventure
* Final Fantasy Origins
* Final Fantasy Tactics

Any other **elegant** solution than to split up the games&#39; names into their components 

* *Title*: &quot;Final Fantasy&quot;
* *Number*: &quot;12&quot;
* *Subtitle*: &quot;Chains of Promathia&quot;

to make sure that they come out in the right order? (10 after 4, not before 2).

Doing so is a pain in the a** because every now and then there&#39;s another game that breaks that mechanism of parsing the game title (e.g. &quot;Warhammer 40,000&quot;, &quot;James Bond 007&quot;)


Natural Sort in MySQL

&gt; **Possible Duplicate:**  
&gt; [What are the obj and bin folders (created by Visual Studio) used for?](https://stackoverflow.com/questions/5308491/what-are-the-obj-and-bin-folders-created-by-visual-studio-used-for)  

&lt;!-- End of automatically inserted text --&gt;

The default output path for any project is Visual studio is **`bin/Debug`**, but I have noticed that `obj` folder is also generated which again contains `dll` and `pdb` files. Can someone tell me why is this folder generated?

What is obj folder generated for?

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/5308491/what-are-the-obj-and-bin-folders-created-by-visual-studio-used-for" target="_blank" rel="noopener noreferrer">What are the obj and bin folders (created by Visual Studio) used for?</a>

The default output path for any project is Visual studio is <code>bin/Debug</code>, but I have noticed that <code>obj</code> folder is also generated which again contains <code>dll</code> and <code>pdb</code> files. Can someone tell me why is this folder generated?

I am trying to display a list of all files found in the selected directory (and optionally any subdirectories). The problem I am having is that when the GetFiles() method comes across a folder that it cannot access, it throws an exception and the process stops.

How do I ignore this exception (and ignore the protected folder/file) and continue adding accessible files to the list?


    try
    {
        if (cbSubFolders.Checked == false)
        {
            string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath);
            foreach (string fileName in files)
                ProcessFile(fileName);
        }
        else
        {
            string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath, &quot;*.*&quot;, SearchOption.AllDirectories);
            foreach (string fileName in files)
                ProcessFile(fileName);
        }
        lblNumberOfFilesDisplay.Enabled = true;
    }
    catch (UnauthorizedAccessException) { }
    finally {}

Ignore folders/files when Directory.GetFiles() is denied access

I&#39;m attempting to use extension methods to add an operater overload to the C# `StringBuilder` class.  Specifically, given `StringBuilder` `sb`, I&#39;d like `sb += &quot;text&quot;` to become equivalent to `sb.Append(&quot;text&quot;)`.

Here&#39;s the syntax for creating an extension method for `StringBuilder`:

    public static class sbExtensions
    {
        public static StringBuilder blah(this StringBuilder sb)
        {
            return sb;
        }
    } 
It successfully adds the `blah` extension method to the `StringBuilder`.

Unfortunately, operator overloading does not seem to work:

    public static class sbExtensions
    {
        public static StringBuilder operator +(this StringBuilder sb, string s)
        {
            return sb.Append(s);
        }
    } 
Among other issues, the keyword `this` is not allowed in this context.

Are adding operator overloads via extension methods possible?  If so, what&#39;s the proper way to go about it?

Operator Overloading with C# Extension Methods

just wondering if anyone has ever tried embedding and actually integrating any js engine into the .net environment. I could find and actually use (after a **LOT** of pain and effort, since it&#39;s pretty outdated and not quite finished) spidermonkey-dotnet project. Anyone with experience in this area? Engines like SquirrelFish, V8.. 

Not that I&#39;m not satisfied with Mozilla&#39;s Spidermonkey (using it for Rails-like miniframework for custom components inside the core ASP.NET application), but I&#39;d still love to explore a bit further with the options. The command-line solutions are not what I&#39;d need, I cannot rely on anything else than CLR, I need to call methods from/to JavaScript/C# objects.

    // c# class
    public class A
    {
        public string Hello(string msg)
        {
            return msg + &quot; whatewer&quot;;
        }
    }

    // js snippet
    var a = new A();
    console.log(a.Hello(&#39;Call me&#39;)); // i have a console.log implemented, don&#39;t worry, it&#39;s not a client-side code :)


Just to clarify - I&#39;m not trying to actually program **the application itself** in server-side javascript. It&#39;s used solely for writing custom user subapplications (can be seen as some sort of DSL). It&#39;s much easier (and safer) to allow normal people programming in js than C#.

Embedding JavaScript engine into .NET

Switch statement fallthrough is one of my personal major reasons for loving `switch` vs. `if/else if` constructs. An example is in order here:

    static string NumberToWords(int number)
    {
        string[] numbers = new string[] 
            { &quot;&quot;, &quot;one&quot;, &quot;two&quot;, &quot;three&quot;, &quot;four&quot;, &quot;five&quot;, 
              &quot;six&quot;, &quot;seven&quot;, &quot;eight&quot;, &quot;nine&quot; };
        string[] tens = new string[] 
            { &quot;&quot;, &quot;&quot;, &quot;twenty&quot;, &quot;thirty&quot;, &quot;forty&quot;, &quot;fifty&quot;, 
              &quot;sixty&quot;, &quot;seventy&quot;, &quot;eighty&quot;, &quot;ninety&quot; };
        string[] teens = new string[]
            { &quot;ten&quot;, &quot;eleven&quot;, &quot;twelve&quot;, &quot;thirteen&quot;, &quot;fourteen&quot;, &quot;fifteen&quot;,
              &quot;sixteen&quot;, &quot;seventeen&quot;, &quot;eighteen&quot;, &quot;nineteen&quot; };

        string ans = &quot;&quot;;
        switch (number.ToString().Length)
        {
            case 3:
                ans += string.Format(&quot;{0} hundred and &quot;, numbers[number / 100]);
            case 2:
                int t = (number / 10) % 10;
                if (t == 1)
                {
                    ans += teens[number % 10];
                    break;
                }
                else if (t &gt; 1)
                    ans += string.Format(&quot;{0}-&quot;, tens[t]);
            case 1:
                int o = number % 10;
                ans += numbers[o];

                break;
            default:
                throw new ArgumentException(&quot;number&quot;);
        }
        return ans;
    }

The smart people are cringing because the `string[]`s should be declared outside the function: well, they are, this is just an example.

The compiler fails with the following error:

&lt;pre&gt;
Control cannot fall through from one case label (&#39;case 3:&#39;) to another
Control cannot fall through from one case label (&#39;case 2:&#39;) to another
&lt;/pre&gt;

Why? And is there any way to get this sort of behaviour without having three `if`s?

Switch statement fallthrough in C#?

Currently I am [borrowing `java.math.BigInteger` from the J# libraries as described here](http://msdn.microsoft.com/en-us/magazine/cc163696.aspx). Having never used a library for working with large integers before, this seems slow, on the order of 10 times slower, even for `ulong` length numbers. Does anyone have any better (preferably free) libraries, or is this level of performance normal?

Big integers in C#

I am wondering about what the difference between logging and tracing is.

Is the difference basically that tracing is more detailed log giving developers a tool to debug applications at runtime?

I have been experimenting with log4net and doing logging. Now I am wondering if I should be doing tracing as well and if I could/should use log4net for that purpose. 
Should I be doing tracing with log4net and is there some trace level for log4net loggers? Should I use a different log level for debug and trace purposes or is it ok to use the same?
Can you give a simple example on how I would do logging and tracing for a simple method?

Edit:
Despite a few helpful answers below I am still unsure how I should be doing tracing versus logging. 

I have the following method in my Business layer and I want to add logging/tracing to it. I am wondering how to do it efficiently. Is the following method acceptable in terms of logging/tracing? Should the log messages be of type Info instead of Debug? Are the Debug messages I am logging considered trace? How would you change it?

&lt;pre&gt;
&lt;code&gt;
IEnumerable&amp;lt;Car&amp;gt; GetCars()
{
   try
   {
      logger.Debug(&quot;Getting cars&quot;);
      IEnumerable&amp;lt;Car&amp;gt; cars = CarAccessor.GetCars().ConvertAll(DataAccessToBusinessConverter);
      logger.Debug(&quot;Got total of &quot; + cars.Count + &quot; cars&quot;); 
   } catch (Exception e) {
      logger.Error(&quot;Error when getting cars&quot;, e);
      throw new Exception(&quot;Unexpected error when getting cars&quot;);
   }
}
&lt;/code&gt;
&lt;/pre&gt;

Tracing versus Logging and how does log4net fit in?

Being primarily a C++ developer the absence of [RAII (Resource Acquisition Is Initialization)](http://en.wikipedia.org/wiki/Resource_acquisition_is_initialization) in Java and .NET has always bothered me. The fact that the onus of cleaning up is moved from the class writer to its consumer (by means of `try finally` or .NET&#39;s [`using` construct](http://blogs.msdn.com/cyrusn/archive/2005/05/10/415956.aspx)) seems to be markedly inferior.

I see why in Java there is no support for RAII since all objects are located on the heap and the garbage collector inherently doesn&#39;t support deterministic destruction, but in .NET with the introduction of value-types (`struct`) we have the (seemingly) perfect candidate for RAII. A value type that&#39;s created on the stack has a well defined scope and C++ destructor semantics can be used. However the CLR does not permit a value-type to have a destructor.

My random searches found one argument that if a value-type is [boxed](http://www.csharphelp.com/archives/archive100.html) it falls under the jurisdiction of the garbage collector and therefore its destruction becomes non-deterministic. 
I feel that this argument isn&#39;t strong enough, the benefits of RAII are big enough to say that a value-type with a destructor cannot be boxed (or used as a class member).

**To cut a long story short my question is**: are there any other reasons value types can not be used in order to introduce RAII to .NET?  (or do you think my argument about RAII&#39;s obvious advantages are flawed?)

**Edit:** I must have not phrased the question clearly since the first four answers have missed the point. I *know* about `Finalize` and its non-deterministic characteristics, I know about the `using` construct and I feel these two options are inferior to RAII. `using` is one more thing the consumer of a class must remember (how many people forgot to put a `StreamReader` in a `using` block?). My question is a philosophical one about the language design, why is it the way it is and can it be improved?

For instance with a generic deterministically destructible value-type I can make the `using` and `lock` keywords redundant (achievable by library classes):

        public struct Disposer&lt;T&gt; where T : IDisposable
        {
            T val;
            public Disposer(T t) { val = t; }
            public T Value { get { return val; } }
            ~Disposer()  // Currently illegal 
            {
                if (val != default(T))
                    val.Dispose();
            }
        }
        

---

I can&#39;t help but end with a apropos quotation which I once saw but can&#39;t currently find its origin.
&gt; You can take my deterministic destruction when my cold dead hand goes out of scope.  --*Anon*


Why is there no RAII in .NET?

I would like to be able to trap &lt;kbd&gt;CTRL&lt;/kbd&gt;+&lt;kbd&gt;C&lt;/kbd&gt; in a C# console application so that I can carry out some cleanups before exiting. What is the best way of doing this?

How do I trap ctrl-c (SIGINT) in a C# console app

Is it better to do this:

    try
    {
        ...
    }
    catch (Exception ex)
    {
        ...
        throw;
    }

Or this:

    try
    {
        ...
    }
    catch (Exception ex)
    {
        ...
        throw ex;
    }

Do they do the same thing? Is one better than the other?







What is the proper way to rethrow an exception in C#?

I recently read this Phil Haack post ([The Most Useful .NET Utility Classes Developers Tend To Reinvent Rather Than Reuse][1]) from last year, and thought I&#39;d see if anyone has any additions to the list.

  [1]: http://haacked.com/archive/2007/06/13/the-most-useful-.net-utility-classes-developers-tend-to-reinvent.aspx

Most useful .NET utility classes developers tend to reinvent rather than reuse

I&#39;m doing some architectural cleanup that involves moving a bunch of classes into different projects and/or namespaces. Currently I&#39;m moving the files by hand, building, and then manually adding *using Foo* statements as needed to resolve compilation errors. Anyone know of a smarter way of doing this? (We&#39;re a CodeRush and Refactor! shop, but I&#39;d be interested to hear if Resharper has support for this)

Visual Studio: Is there a &quot;move class to different namespace&quot; refactoring?

Is there a way in Visual Studio (a hotkey) to automatically import a type (or choosing between known namespaces) like the &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;O&lt;/kbd&gt; in Eclipse?

Automatic namespaces import

Is there any way to change the background color of the Solution Explorer in Visual Studio using a Theme?  - or any other way for that matter?

I can change it by changing windows-wide color settings, but obviously that affects too much.

Change background color of Solution Explorer in Visual Studio

This seems like the most basic question in the world, but damned if I can find an answer.

Is there a keyboard shortcut, either native to Visual Studio or through Code Rush or other third-party plug-in, to wrap the current selection with an HTML tag? I&#39;m tired of typing the opening tag, cutting the misplaced closing tag to the clipboard, moving the cursor, and pasting it at the end where it belongs.

**Update:** [This is how TextMate handles surrounding a selection with a tag][1]. Frankly, I&#39;m stunned that Visual Studio doesn&#39;t seem to have a similar feature. Creating a macro or snippet for every conceivable tag I might want to use seems absurd.


  [1]: http://screencast.com/t/pesxOgON

How do I wrap a selection with an HTML tag in Visual Studio?

I have a collection of Boost unit tests I want to run as a console application.

When I&#39;m working on the project and I run the tests I would like to be able to debug the tests, and I would like to have the console stay open after the tests run.

I see that if I run in release mode the console window stays up after the program exits, but in debug mode this is not the case.

I do not want to add &#39;system(&quot;pause&quot;);&#39; or any other hacks like reading a character to my program. I just want to make Visual Studio pause after running the tests with debugging like it would if I were running in release mode. I would also like it if the output of tests were captured in one of Visual Studio&#39;s output windows, but that also seems to be harder than it should be.

How can I do this?


How do I make Visual Studio pause after executing a console application in debug mode?

Does anyone know how to tell VS(2008) where to save the obj folder when building the solution? We have it save the bin folder to another path in order to keep the source file folders small (ie. emailable), but can&#39;t find any way to tell it to do the same with obj...

VisualStudio: How to save the obj folder somewhere else

I am working on an open source C++ project, for code that compiles on Linux and Windows. I use CMake to build the code on Linux. For ease of development setup and political reasons, I must stick to Visual Studio project files/editor on Windows (I can&#39;t switch to [Code::Blocks][1], for example). I see instructions to generate Visual Studio files using CMake, as [here][2].

Have you used CMake to generate Visual Studio files before? How has been your experience? Suppose I want to add a new file to my project. What is the workflow for this?

  [1]: http://en.wikipedia.org/wiki/Code::Blocks
  [2]: http://www.opentissue.org/mediawiki/index.php/Using_CMake


Using CMake to generate Visual Studio C++ project files

Most Stackoverflow answers that I have found in regards to the Perl build process and unit testing and code coverage simply point me to CPAN for the documentation there.  There&#39;s absolutely nothing wrong with pointing to CPAN modules because that&#39;s where the full documentation is supposed to reside.  I&#39;ve had trouble finding complete working code examples in many cases, though.  

I&#39;ve been searching all over the Internet for actual working code samples that I can download or paste into my IDE, like your typical tutorial &quot;Hello World&quot; example source code, but of an example that demonstrates the build process with unit testing and code coverage analysis.  Does anyone have a small example of a complete working project that demonstrates these technologies and processes?  

*(I do have a small working example and I will answer my own question with it, but there are probably other SO users who have better examples than the ones I came up with.)*


Perl build, unit testing, code coverage: A complete working example

A few years ago, I read the [Recursive Make Considered Harmful](http://aegis.sourceforge.net/auug97.pdf) paper and implemented the idea in my own build process.  Recently, I read another article with ideas about how to [implement non-recursive `make`](http://sites.e-advies.nl/nonrecursive-make.html).  So I have a few data points that non-recursive `make` works for at least a few projects.

But I&#39;m curious about the experiences of others.  Have you tried non-recursive `make`?  Did it make things better or worse?  Was it worth the time?

What is your experience with non-recursive make?

I want to package my project in a single executable JAR for distribution.

How can I make a Maven project package all dependency JARs into my output JAR?

Content Type	Original Author	Original Content on Stackoverflow
Question	Nazgul	View Question on Stackoverflow
Solution 1 - C#	casademora	View Answer on Stackoverflow

What is obj folder generated for?

C# Problem Overview

C# Solutions

Solution 1 - C#

Natural Sort in MySQL

Regex to match URL end-of-line or "/" character

Attributions