If for you it is enough to have the source available (but not really *open* regarding the license) I still consider very useful FamilyShow ([http://www.vertigo.com/FamilyShow.aspx][1]) and Prism ([http://www.codeplex.com/CompositeWPF][2]) for an approach at a different &quot;scale&quot;.


  [1]: http://www.vertigo.com/FamilyShow.aspx
  [2]: http://www.codeplex.com/CompositeWPF

[Crack.NET][1] and [Prism][2] come to mind.


  [1]: http://www.codeplex.com/cracknetproject
  [2]: http://www.codeplex.com/CompositeWPF

You might be interested in the sample applications of the [**WPF Application Framework (WAF)**][1]. They show:

 * View composition

 * UI Workflow (Wizards)

 * Command binding / Shortcut Keys

 * MVVM pattern, Unit Testing

 * Validation

 * Entity Framework

 * Open/Save FileDialog

 * Print Preview / Print Dialog

 * Localization
 


  [1]: http://waf.codeplex.com

Although I haven&#39;t looked at it much myself, I&#39;ve heard really good things about [Caliburn][1] It&#39;s an open source framework to help you build applications in SL and WPF using best practices and patterns such as MVC and MVVM.


  [1]: http://www.codeplex.com/caliburn

Still not really &quot;open&quot;, but very interesting&lt;br /&gt;
MSDN Reader [http://code.msdn.microsoft.com/msdnreader][1]


  [1]: http://code.msdn.microsoft.com/msdnreader

Couple more from codeplex:

- [Timeline Control for WPF and Silverlight](http://timeline.codeplex.com/)
- [Color Wheel Controls for WPF and Silverlight](http://color.codeplex.com/)

Django templates offer the builtin tag `cycle` for alternating between several values at different points in a template (or for loop in a template) but this tag does not reset when it is accessed in a scope outside of the `cycle`s definition.  I.e., if you have two or more lists in your template, the rows of all of which you&#39;d like to use some css definitions `odd` and `even`, the first row of a list will pick up where the last left off, not with a fresh iteration from the choices (`odd` and `even`)

E.g., in the following code, if the first blog has an odd number of entries, then the first entry in a second blog will start as `even`, when I want it to start at `odd`.

    {% for blog in blogs %}
      {% for entry in blog.entries %}
        &lt;div class=&quot;{% cycle &#39;odd&#39; &#39;even&#39; %}&quot; id=&quot;{{entry.id}}&quot;&gt;
          {{entry.text}}
        &lt;/div&gt;
      {% endfor %}
    {% endfor %}

I&#39;ve tried obviating this by patching with the `resetcycle` tag offered here:

[Django ticket: Cycle tag should reset after it steps out of scope][1]

to no avail.  (The code didn&#39;t work for me.)

I&#39;ve also tried moving my inner loop into a custom tag, but this also did not work, perhaps because the compile/render cycle moves the loop back into the outer loop?  (Regardless of why, it didn&#39;t work for me.)

How can I accomplish this simple task!?  I&#39;d prefer not to create a data structure in my view with this information pre-compiled; that seems unnecessary.  Thanks in advance.


  [1]: http://code.djangoproject.com/ticket/5908

Alternate Row Coloring in Django Template with More Than One Set of Rows

Why should I use templating system in PHP?

The reasoning behind my question is: PHP itself is feature rich templating system, why should I install another template engine?

The only two pros I found so far are:

 1. A bit cleaner syntax (sometimes)
 2. Template engine is not usually powerful enough to implement business logic so it forces you to separate concerns. Templating with PHP can lure you to walk around the templating principles and start writing code soup again.

... and both are quite negligible when compared to cons.

Small example:


**PHP**
    
    &lt;h1&gt;&lt;?=$title?&gt;&lt;/h1&gt;
    &lt;ul&gt;
      &lt;? foreach ($items as $item) {?&gt;
      &lt;li&gt;&lt;?=$item?&gt;&lt;/li&gt;
      &lt;? } ?&gt;
    &lt;/ul&gt;
    
    
**Smarty**
    
    &lt;h1&gt;{$title}&lt;/h1&gt;
    &lt;ul&gt;
      {foreach item=item from=$items}
      &lt;li&gt;{$item}&lt;/li&gt;
      {/foreach}
    &lt;/ul&gt;


I really don&#39;t see any difference at all.

Why should I use templating system in PHP?

I have programmed with WPF for more than a year. When I started there weren&#39;t so many examples and guidelines to follow, now the situation is much more better.

I would like to ask you some help in listing the best WPF (open) source code examples or projects that you suggest to study in order to learn more about project structure, best practices, etc.

Thank you,
Marco



Best WPF open source projects

I have programmed with WPF for more than a year. When I started there weren't so many examples and guidelines to follow, now the situation is much more better.
I would like to ask you some help in listing the best WPF (open) source code examples or projects that you suggest to study in order to learn more about project structure, best practices, etc.
Thank you,
Marco

`msiexec` is command prompt software that installs an [MSI][1] program. But I have found that you can install an MSI file from the command line by just typing in the name of the MSI file on the command line.

But in order to uninstall the MSI file, it seems you have to call the `msiexec` program and give it a `/x` or `/uninstall`.

How can I uninstall an MSI from the command line without using the `msiexec` routine?

  [1]: http://en.wikipedia.org/wiki/Windows_Installer


Uninstalling an MSI file from the command line without using msiexec

So I have a generic list, and an `oldIndex` and a `newIndex` value.

I want to move the item at `oldIndex`, to `newIndex`...as simply as possible.

Any suggestions?

Note
----
The item should be end up between the items at `(newIndex - 1)` and `newIndex` *before* it was removed.

Generic List - moving an item within the list

So this seems pretty basic but I can&#39;t get it to work.  I have an Object, and I am using reflection to get to it&#39;s public properties.  One of these properties is static and I&#39;m having no luck getting to it.

    Public Function GetProp(ByRef obj As Object, ByVal propName as String) as PropertyInfo
        Return obj.GetType.GetProperty(propName)
        
    End Function

The above code works fine for Public Instance properties, which up until now is all that I have needed.  Supposedly I can use BindingFlags to request other types of properties (private, static), but I can&#39;t seem to find the right combination.

    Public Function GetProp(ByRef obj As Object, ByVal propName as String) as PropertyInfo
        Return obj.GetType.GetProperty(propName, Reflection.BindingFlags.Static Or Reflection.BindingFlags.Instance Or Reflection.BindingFlags.Public)
        
    End Function

But still, requesting any Static members return nothing.  .NET reflector can see the static properties just fine, so clearly I am missing something here.

How to get a Static property with Reflection

I have a class that handles events from a WinForms control. Based on what the user is doing, I am deferencing one instance of the class and creating a new one to handle the same event. I need to unsubscribe the old instance from the event first - easy enough. I&#39;d like to do this in a non-proprietary manner if possible, and it seems like this is a job for IDisposable. However, most documentation recommends IDisposable only when using unmanaged resources, which does not apply here.

If I implement IDisposable and unsubscribe from the event in Dispose(), am I perverting its intention? Should I instead provide an Unsubscribe() function and call that?


----------


**Edit:** Here&#39;s some dummy code that kind of shows what I&#39;m doing (using IDisposable). My actual implementation is related to some proprietary data binding (long story).

    class EventListener : IDisposable
    {
        private TextBox m_textBox;

        public EventListener(TextBox textBox)
        {
            m_textBox = textBox;
            textBox.TextChanged += new EventHandler(textBox_TextChanged);
        }

        void textBox_TextChanged(object sender, EventArgs e)
        {
            // do something
        }

        public void Dispose()
        {
            m_textBox.TextChanged -= new EventHandler(textBox_TextChanged);
        }
    }

    class MyClass
    {
        EventListener m_eventListener = null;
        TextBox m_textBox = new TextBox();

        void SetEventListener()
        {
            if (m_eventListener != null) m_eventListener.Dispose();
            m_eventListener = new EventListener(m_textBox);
        }
    }

In the actual code, the &quot;EventListener&quot; class is more involved, and each instance is uniquely significant. I use these in a collection, and create/destroy them as the user clicks around.


----------
**Conclusion**

I&#39;m accepting [gbjbaanb&#39;s answer][1], at least for now. I feel that the benefit of using a familiar interface outweighs any possible downside of using it where no unmanaged code is involved (how would a user of this object even know that?).

If anyone disagrees - please post/comment/edit. If a better argument can be made against IDisposable, then I&#39;ll change the accepted answer.


  [1]: https://stackoverflow.com/questions/452281/using-idisposable-to-unsubscribe-events#452321

Using IDisposable to unsubscribe events

I need to process a large file, around 400K lines and 200 M. But sometimes I have to process from bottom up. How can I use iterator (yield return) here? Basically I don&#39;t like to load everything in memory. I know it is more efficient to use iterator in .NET.

How to read a text file reversely with iterator in C#

In the MVVM pattern for WPF, handling dialogs is one of the more complex operations.  As your view model does not know anything about the view, dialog communication can be interesting.  I can expose an `ICommand` that when the view invokes it, a dialog can appear.

Does anyone know of a good way to handle results from dialogs? I am speaking about windows dialogs such as `MessageBox`.

One of the ways we did this was have an event on the viewmodel that the view would subscribe to when a dialog was required.

&lt;!-- language-all: lang-cs --&gt;

    public event EventHandler&lt;MyDeleteArgs&gt; RequiresDeleteDialog;

This is OK, but it means that the view requires code which is something I would like to stay away from.

Handling Dialogs in WPF with MVVM

The built-in WPF TreeView control does not allow for multi selection, like a ListBox does.  How can I customize the TreeView to allow for multi selection without rewriting it. 

Customizing the TreeView to allow multi select

In the example below I have a ListBox with dozens of font names in it.

I would have thought it would automatically have a vertical scrollbar on it so that you can select ANY font, not just the first ones in the list, but it doesn&#39;t.

So I added a &quot;ScrollViewer&quot; and that puts a &quot;scrollbar area&quot; on the right but there is no scrollbar in the scrollbar area so that you can scroll (!).

Why isn&#39;t a scrollbar automatic and how do I force it to have a scrollbar?

    &lt;StackPanel Name=&quot;stack1&quot;&gt;
        &lt;Grid&gt;
            &lt;Grid.RowDefinitions&gt;
                &lt;RowDefinition Height=&quot;2*&quot;&gt;&lt;/RowDefinition&gt;
                &lt;RowDefinition Height=&quot;*&quot;&gt;&lt;/RowDefinition&gt;
            &lt;/Grid.RowDefinitions&gt;
            &lt;ScrollViewer&gt;
                &lt;ListBox Grid.Row=&quot;0&quot; Name=&quot;lstFonts&quot; Margin=&quot;3&quot;  ItemsSource=&quot;{x:Static Fonts.SystemFontFamilies}&quot;/&gt;
            &lt;/ScrollViewer&gt;
        &lt;/Grid&gt;
    &lt;/StackPanel&gt;

How can I get a vertical scrollbar in my ListBox?

I have a WPF dialog with a couple of textboxes on it.
Textboxes are bound to my business object and have WPF validation rules attached.

The problem is that user can perfectly click &#39;OK&#39; button and close the dialog, without actually entering the data into textboxes. Validation rules never fire, since user didn&#39;t even attempt entering the information into textboxes.

Is it possible to force validation checks and determine if some validation rules are broken?

I would be able to do it when user tries to close the dialog and prohibit him from doing it if any validation rules are broken.

Thank you.

Force validation on bound controls in WPF

How can I add a newline in the text of a label in WPF such as the following?

    &lt;Label&gt;Lorem 
      ipsum&lt;/Label&gt;

Newline in a WPF-label?

Please list GUI programming libraries, toolkits, frameworks which allow to write GUI apps *quickly*. I mean in such a way, that

 * GUI is described entirely in a human-readable (and human-writable) plain text file (code)
 * code is terse (1 or 2 lines of code per widget/event pair), suitable for scripting
 * structure and operation of the GUI is evident from the code (nesting of widgets and flow of events)
 * details about *how* to build the GUI are hidden (things like mainloop, attaching event listeners, etc.)
 * auto-layouts are supported (vboxes, hboxes, etc.)

As answers suggest, this may be defined as *declarative* GUI programming, but it is not necessarily such. Any approach is OK if it works, is easy to use and terse.

There are some GUI libraries/toolkits like this. They are listed below. Please extend the list if you see a qualifying toolkit missing. Indicate if the project is crossplatform, mature, active, and give an example if possible.

Please use this wiki to discuss *only Open Source* projects. 

This is the list so far (in alphabetical order):

### Fudgets

[Fudgets](http://www.md.chalmers.se/Cs/Research/Functional/Fudgets/Intro/ex2.html) is a Haskell library. Platform: Unix. Status: Experimental, but still maintained. An example:
 
      import Fudgets
      main = fudlogue (shellF &quot;Hello&quot; (labelF &quot;Hello, world!&quot; &gt;+&lt; quitButtonF))

[![Fudgets example screenshot][1]][1]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/02/40/1883597_93x80.gif))&lt;/sub&gt;  

### GNUstep Renaissance

[Renaissance](http://www.gnustep.it/Renaissance/Screenshots.html) allows to describe GUI in simple XML. Platforms: OSX/GNUstep. Status: part of GNUstep. An example below:

    &lt;window title=&quot;Example&quot;&gt;
      &lt;vbox&gt;
        &lt;label font=&quot;big&quot;&gt;
          Click the button below to quit the application
        &lt;/label&gt;
        &lt;button title=&quot;Quit&quot; action=&quot;terminate:&quot;/&gt;
      &lt;/vbox&gt;
    &lt;/window&gt; 

[![Renaissance example screenshot][2]][2]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/03/19/1884098_289x80.png))&lt;/sub&gt;  

### HTML

HTML-based GUI (HTML + JS). Crossplatform, mature. Can be used entirely on the client side.

Looking for a nice “helloworld” example.

[![HTML GUI example][3]][3]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/02/44/1883635_264x60.png))&lt;/sub&gt;  

### JavaFX

[JavaFX](http://hackety.org/2007/05/09/soGooeyCanYouSeeTheButton.html) is usable for standalone (desktop) apps as well as for web applications. Not completely crossplatform, not yet completely open source. Status: 1.0 release. An example:

      Frame {
        content: Button {
          text: &quot;Press Me&quot;
          action: operation() {
             System.out.println(&quot;You pressed me&quot;);
          }
        }
        visible: true
      }

*Screenshot is needed.*

### Phooey

[Phooey](http://www.haskell.org/haskellwiki/Phooey#One_example.2C_two_interfaces) is another Haskell library. Crossplatform (wxWidgets), HTML+JS backend planned. Mature and active. An example (a little more than a helloworld):
 
      ui1 :: UI ()
      ui1 = title &quot;Shopping List&quot; $
            do a &lt;- title &quot;apples&quot;  $ islider (0,10) 3
               b &lt;- title &quot;bananas&quot; $ islider (0,10) 7
               title &quot;total&quot; $ showDisplay (liftA2 (+) a b)

[![Phooey example screenshot][4]][4]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/02/33/1883543_236x187.png))&lt;/sub&gt;  

### PythonCard

[PythonCard](http://pythoncard.sourceforge.net/index.html) describes GUI in a Python dictionary. Crossplatform (wxWidgets). Some apps use it, but the project seems stalled. There is an active fork.

*I skip [PythonCard example](http://www.halfcooked.com/presentations/osdc/pythoncard.html) because it is too verbose for the contest.*

[![PythonCard example screenshot][5]][5]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/02/46/1883646_199x99.gif))&lt;/sub&gt;  

### Shoes

[Shoes](http://shoooes.net/tutorial/) for Ruby. Platforms: Win/OSX/GTK+. Status: Young but active. A minimal app looks like this:

      Shoes.app {
         @push = button &quot;Push me&quot;
         @note = para &quot;Nothing pushed so far&quot;
         @push.click {
            @note.replace &quot;Aha! Click!&quot;
         }
      }

[![Shoes example screenshot][6]][6]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/03/14/1884011_227x71.png))&lt;/sub&gt;  

### Tcl/Tk

[Tcl/Tk](http://wiki.tcl.tk/488). Crossplatform (its own widget set). Mature (probably even dated) and active. An example:

      #!/usr/bin/env wish
      button .hello -text &quot;Hello, World!&quot; -command { exit }
      pack .hello
      tkwait window .

[![Tcl/Tk example screenshot][7]][7]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/02/51/1883672_111x58.png))&lt;/sub&gt;  
  
### tekUI

[tekUI](http://tekui.neoscientists.org/) for Lua (and C). Platforms: X11, DirectFB. Status: Alpha (usable, but API still evolves). An example:
 
      #/usr/bin/env lua
      ui = require &quot;tek.ui&quot;
      ui.Application:new {
        Children = {
          ui.Window:new  {
            Title = &quot;Hello&quot;,
            Children = {
              ui.Text:new {
                Text = &quot;_Hello, World!&quot;, Style = &quot;button&quot;, Mode = &quot;button&quot;,
              },
            },
          },
        },
      }:run()

[![tekUI helloworld screenshot][8]][8]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/03/01/1883821_290x55.png))&lt;/sub&gt;  

### Treethon

[Treethon](http://code.google.com/p/treethon/) for Python. It describes GUI in a YAML file (*Python in a YAML tree*). Platform: GTK+. Status: work in proress. A simple app looks like this:
    
      _import: gtk
      view: gtk.Window()
      add:
          - view: gtk.Button(&#39;Hello World&#39;)
            on clicked: print view.get_label()

![Treethon helloworld screenshot](http://treethon.googlecode.com/svn/trunk/treethon_gtk_tutorial/base.png)

### Yet unnamed Python library by Richard Jones:

This one is not released yet. The idea is to use Python context managers (`with` keyword) to structure GUI code. See [Richard Jones&#39; blog](http://www.mechanicalcat.net/richard/log/Python/Something_I_m_working_on.3) for details.

    with gui.vertical:
        text = gui.label(&#39;hello!&#39;)
        items = gui.selection([&#39;one&#39;, &#39;two&#39;, &#39;three&#39;])
        with gui.button(&#39;click me!&#39;):
            def on_click():
                text.value = items.value
                text.foreground = red

### XUL

[XUL](https://developer.mozilla.org/en/Getting_started_with_XULRunner) + Javascript may be used to create stand-alone desktop apps with XULRunner as well as Mozilla extensions. Mature, open source, crossplatform.

      &lt;?xml version=&quot;1.0&quot;?&gt;
      &lt;?xml-stylesheet href=&quot;chrome://global/skin/&quot; type=&quot;text/css&quot;?&gt;
      &lt;window id=&quot;main&quot; title=&quot;My App&quot; width=&quot;300&quot; height=&quot;300&quot;
      xmlns=&quot;http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul&quot;&gt;
        &lt;caption label=&quot;Hello World&quot;/&gt;
      &lt;/window&gt;

[![XUL helloworld example][9]][9]  
&lt;sub&gt;(source: [picamatic.com](http://www.picamatic.com/show/2009/01/28/03/27/1884209_228x108.png))&lt;/sub&gt;  


----

Thank your for contributions!

 [1]: https://i.stack.imgur.com/gZpvz.gif
 [2]: https://i.stack.imgur.com/rTq0B.png
 [3]: https://i.stack.imgur.com/JRURg.png
 [4]: https://i.stack.imgur.com/Xb2sr.png
 [5]: https://i.stack.imgur.com/M4lro.gif
 [6]: https://i.stack.imgur.com/Xip3H.png
 [7]: https://i.stack.imgur.com/IWNGJ.png
 [8]: https://i.stack.imgur.com/tzI7A.png
 [9]: https://i.stack.imgur.com/UOy86.png

Very simple, terse and easy GUI programming “frameworks”

I&#39;m looking for an open source implementation, preferably in python, of **Textual Sentiment Analysis** ([http://en.wikipedia.org/wiki/Sentiment_analysis][1]). Is anyone familiar with such open source implementation I can use?

I&#39;m writing an application that searches twitter for some search term, say &quot;youtube&quot;, and counts &quot;happy&quot; tweets vs. &quot;sad&quot; tweets. 
I&#39;m using Google&#39;s appengine, so it&#39;s in python. I&#39;d like to be able to classify the returned search results from twitter and I&#39;d like to do that in python.
I haven&#39;t been able to find such sentiment analyzer so far, specifically not in python. 
Are you familiar with such open source implementation I can use? Preferably this is already in python, but if not, hopefully I can translate it to python.

Note, the texts I&#39;m analyzing are VERY short, they are tweets. So ideally, this classifier is optimized for such short texts.

BTW, twitter does support the &quot;:)&quot; and &quot;:(&quot; operators in search, which aim to do just this, but unfortunately, the classification provided by them isn&#39;t that great, so I figured I might give this a try myself.

Thanks!

BTW, an early demo is [here][2] and the code I have so far is [here][3] and I&#39;d love to opensource it with any interested developer.


  [1]: http://en.wikipedia.org/wiki/Sentiment_analysis
  [2]: http://twitgraph.appspot.com/?show_inputs=1&amp;duration=30&amp;q=youtube+annotations
  [3]: http://code.google.com/p/twitgraph/

Sentiment analysis for Twitter in Python

I am having trouble understanding the usage permissions of open source. I read somewhere that GPL or LGPL enforces that software that uses GPL software must also be released open-source. I want to create an application that uses some open-source image recognition library. Can I sell this application or does it have to be open source?

Thanks!

GPL and LGPL open source licensing restrictions

I want to publish one of my applications as open-source and want to digitally sign the binaries I&#39;ve created with my own certificate. (Of course, anyone else can just download the code and build it themselves with their own certificate.) I want to do this so anyone can check that this build was made by me, not by someone else. I also want to create a secure website with a valid SSL certificate so visitors can create their own accounts in a secure way so they can contribute to this project.

I could create a self-signed certificate, but I don&#39;t really like that option. Or I could pay Verisign a few gold pieces to get the certificates that would be valid for just a few years. I don&#39;t like that option either, since my treasury is valuable to me.

So, are there any other options? For example, a provider that supports open-source projects by offering certificates for a reduced price? It doesn&#39;t have to be free, just a lot less expensive than Verisign...

(The Project is created in C# with [Visual&amp;nbsp;Studio&amp;nbsp;2008][1]. Plus an additional project in ASP.NET that wants SSL.)

  [1]: http://en.wikipedia.org/wiki/Microsoft_Visual_Studio#Visual_Studio_2008



Code signing certificate for open-source projects?

Today [I had a bad surprise][1] learning about some implications of the GPL license, mainly that I couldn&#39;t use it as freely as I thought. 

Now I know.

**What else should I know, and more widely, what should every developer know about legal things like that?** 

You can separate employees, freelancers, open source projects contributors (etc.) or give a more broad answer.


  [1]: https://stackoverflow.com/questions/1394623/can-i-dynamically-call-a-lgpl-gpl-software-in-my-closed-source-application

Content Type	Original Author	Original Content on Stackoverflow
Question	Drake	View Question on Stackoverflow
Solution 1 - .Net	Fabrizio C.	View Answer on Stackoverflow
Solution 2 - .Net	Kent Boogaart	View Answer on Stackoverflow
Solution 3 - .Net	jbe	View Answer on Stackoverflow
Solution 4 - .Net	Jacob Adams	View Answer on Stackoverflow
Solution 5 - .Net	Fabrizio C.	View Answer on Stackoverflow
Solution 6 - .Net	asyrov	View Answer on Stackoverflow

Best WPF open source projects

.Net Problem Overview

.Net Solutions

Solution 1 - .Net

Solution 2 - .Net

Solution 3 - .Net

Solution 4 - .Net

Solution 5 - .Net

Solution 6 - .Net

Why should I use templating system in PHP?

Alternate Row Coloring in Django Template with More Than One Set of Rows

Attributions