&gt; Does anyone have any ideas about what could be going on?

Yup - primary constructors have been removed from the plans for C# 6. They may well make an appearance in some form in a later version, but they&#39;re not in C# 6 any more.

See the [&quot;Changes to the language feature set&quot;][1] post from the team for more details.


  [1]: https://roslyn.codeplex.com/discussions/568820

I&#39;m trying to set UIImageView programmatically in Xcode 6.1:

    @IBOutlet weak var bgImage: UIImageView!
    
    var image : UIImage = UIImage(named:&quot;afternoon&quot;)!
    bgImage = UIImageView(image: image)
    bgImage.frame = CGRect(x: 0, y: 0, width: 100, height: 200)
    view.addSubview(bgImage)

But Xcode is saying &quot;expected declaration&quot; with `bgImage = UIImageView(image: image)`  Image `&quot;afternoon&quot;`is a PNG, and my understanding is PNG does not need an extension in XCode 6.1.

Also tried just `bgImage.image = UIImage(named: &quot;afternoon&quot;)`, but still get:

![enter image description here][1]

  [1]: https://i.stack.imgur.com/zslbH.jpg

**UPDATE**

OK, I have put the code to update `UIImageView` into the `viewDidLoad` function, but `UIImageView` is still not showing the image (which exists in the base directory as afternoon.png):

    @IBOutlet weak var bgImage: UIImageView!
    @IBOutlet weak var dateLabel: UILabel!
    @IBOutlet weak var timeLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        updateTime()
        var timer = NSTimer()
        let aSelector : Selector = &quot;updateTime&quot;
        timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: aSelector, userInfo: nil, repeats: true)
        
        var image : UIImage = UIImage(named:&quot;afternoon&quot;)!
        bgImage = UIImageView(image: image)
    }



Programmatically set image to UIImageView with Xcode 6.1/Swift

I just started working with Laravel. I need to rewrite a whole system I made some years ago, using Laravel 4 as base framework. In my old system, I used to have a `constant.php` file with some constants declared, and a `globals.php` file which contained lots of array sets (for example, categories statuses, type of events, langs, etc.). By doing so, I could use something like

    foreach ( $langs as $code =&gt; $domain ) {
        // Some stuff
    }

anywhere in my app.

My question is, how can I store that info in the so called &quot;laravel way&quot;. I tried using some sort of object to store this info, setting this as a service and creating for it a facade:

**app/libraries/Project/Constants.php**

	namespace PJ;

	class Constants {
		
		public static $langs = [
				&#39;es&#39; =&gt; &#39;www.domain.es&#39;,
				&#39;en&#39; =&gt; &#39;www.domain.us&#39;,
				&#39;uk&#39; =&gt; &#39;www.domain.uk&#39;,
				&#39;br&#39; =&gt; &#39;www.domain.br&#39;,
				&#39;it&#39; =&gt; &#39;www.domain.it&#39;,
				&#39;de&#39; =&gt; &#39;www.domain.de&#39;,
				&#39;fr&#39; =&gt; &#39;www.domain.fr&#39;
			];
	}

**app/libraries/Project/ConstantsServiceProvider.php**

	namespace PJ;
	 
	use Illuminate\Support\ServiceProvider;
	 
	class ConstantsServiceProvider extends ServiceProvider {
	    public function register() {
	        $this-&gt;app-&gt;singleton(&#39;PJConstants&#39;, function() {
	            return new Constants;
	        });
	    }
	}

**app/libraries/Project/ConstantsFacade.php**

	namespace PJ;
	 
	use Illuminate\Support\Facades\Facade;
	 
	class ConstantsFacade extends Facade {
	    protected static function getFacadeAccessor() { 
	        return &#39;PJConstants&#39;;
	    }
	}

**composer.json**

    &quot;psr-4&quot;: {
         &quot;PJ\\&quot;: &quot;app/libraries/Project&quot;
    },

and so I access that property as `PJ\Constants::$langs`.

This works, but I doubt it is the most efficient or correct way of doing it. I mean, is it the right way to &quot;propagate&quot; a variable by creating a whole Service Provider and facades and all such stuff? Or where should I put this data?

Thanks for any advice.

**_EDIT # 01_**

Data I want to pass to all controllers and views can be directly set in script, like in the example at the beginning of my post, **but** it can also be generated dynamically, from a database for example. This data could be a list of categories. I need them in all views to generate a navigation bar, but I also need them to define some routing patterns (like `/category/subcategory/product`), and also to parse some info in several controllers (Like get info from the category that holds X product). 

My array is something  like:

    $categories = [
        1 =&gt; [&#39;name&#39; =&gt; &#39;General&#39;, &#39;parent&#39; =&gt; 0, &#39;description&#39; =&gt; &#39;Lorem ipsum...&#39;],
        2 =&gt; [&#39;name&#39; =&gt; &#39;Nature&#39;, &#39;parent&#39; =&gt; 0, &#39;description&#39; =&gt; &#39;Lorem ipsum...&#39;],
        3 =&gt; [&#39;name&#39; =&gt; &#39;World&#39;, &#39;parent&#39; =&gt; 0, &#39;description&#39; =&gt; &#39;Lorem ipsum...&#39;],
        4 =&gt; [&#39;name&#39; =&gt; &#39;Animals&#39;, &#39;parent&#39; =&gt; 2, &#39;description&#39; =&gt; &#39;Lorem ipsum...&#39;]
    ]

Just as an example. Index is the id of the category, and the Value is info associated with the category.

I need this array, also, available in all Controllers and Views. 

So, should I save it as a Config variable? How else could I store these data; what would be the best and semantically correct way?

Laravel: Where to store global arrays data and constants?

Until this very day, I could make use of primary constructors, such as:

    public class Test(string text)
    {
        private string mText = text;
    }

To be able to do this, in the previous Visual Studio CTP, I had to add this to the csproj-file:

    &lt;LangVersion&gt;Experimental&lt;/LangVersion&gt;

Anyhow, this no longer works in the Visual Studio 2015 Preview (with or without `LangVersion`). Does anyone have any ideas about what could be going on?


Primary constructors no longer compile in VS2015

Until this very day, I could make use of primary constructors, such as:
<pre><code class="hljs language-vbnet">public class Test(string text)
{
 private string mText = text;
}
</code></pre>
To be able to do this, in the previous Visual Studio CTP, I had to add this to the csproj-file:
<pre><code class="hljs language-php-template">&#x3C;LangVersion>Experimental&#x3C;/LangVersion>
</code></pre>
Anyhow, this no longer works in the Visual Studio 2015 Preview (with or without <code>LangVersion</code>). Does anyone have any ideas about what could be going on?

Where is `@Html.Action` in Asp.net Core?
I can see `@Html.ActionLink` but not a direct call to an Action as before.

Was it replaced by ViewComponents?



@Html.Action in Asp.Net Core

I&#39;m working on a simple blackjack game project. Firstly I create the array of cards:

    string[] deck = { &quot;2&quot;, &quot;3&quot;, &quot;4&quot;, &quot;5&quot;, &quot;6&quot;, &quot;7&quot;, &quot;8&quot;, &quot;9&quot;, &quot;10&quot;, &quot;J&quot;, &quot;Q&quot;, &quot;K&quot;, &quot;A&quot;, };

than I multiply it 4 and given `deckNumber`:

 

    newDeck = Enumerable.Repeat(deck, deckNumber*4).SelectMany(x =&gt; x).ToArray();

when I want to delete last card from array I apply this:

    newDeck = newDeck.Where(w =&gt; w != newDeck.Last()).ToArray();

so the problem is that code doesn&#39;t removes last item from array, acts like there are multiple arrays and removes all last elements from them. For example with one deck:

    cards: 2 3 4 5 6 7 8 9 10 J Q K A 2 3 4 5 6 7 8 9 10 J Q K A 2 3 4 5 6 7 8 9 10 J Q K A 2 3 4 5 6 7 8 9 10 J Q K A 

when I apply my remove command it become:

    cards: 2 3 4 5 6 7 8 9 10 J Q K 2 3 4 5 6 7 8 9 10 J Q K 2 3 4 5 6 7 8 9 10 J Q K 2 3 4 5 6 7 8 9 10 J Q K 

it removes all the A&#39;s from array. But I want to remove only the last item from whole array. Whats the problem how can I solve this?



Deleting Last Item from Array of String

In EF6 we usually able to use this way to configure the Entity.

    public class AccountMap : EntityTypeConfiguration&lt;Account&gt;
    {
        public AccountMap()
        {
            ToTable(&quot;Account&quot;);
            HasKey(a =&gt; a.Id);

            Property(a =&gt; a.Username).HasMaxLength(50);
            Property(a =&gt; a.Email).HasMaxLength(255);
            Property(a =&gt; a.Name).HasMaxLength(255);
        }
    }

How we can do in EF Core, since when the class I Inherit EntityTypeConfiguration that unable to find the class.

I download the EF Core raw source code from the GitHub, I can&#39;t find it.
Can someone help on this?

EF Core Mapping EntityTypeConfiguration

Connecting and disconnecting to Bluetooth devices has been giving various results on Windows Phone/Desktop 8.1. I have been using the `Windows.Devices.Bluetooth.Rfcomm` namespace and I have tried to connect several devices with different Bluetooth versions/classes.

* Version 1.2 (Class 1 and 2)
* Version 2.0 (Class 1 and 2)
* Version 2.1 (Class 1 and 2)
- Tested on Nokia Lumia 625 and Lumia 635, Dell Latitude E6500 and a Dell Precision M6400.

*Whenever I try to connect to either of the 2.0 or 2.1 devices there are issues. The first time I try to connect to each of the devices everything will go fine and the connection will open. When I subsequently close the connection and re-connect the device, the trouble starts.* 
During the re-connect the connection will never open and the debugger will throw a System.Exception :

    &gt; Message: No further data is available.

Also, when the connection fails the Windows 8.1 devices will keep trying to (unsuccessfully) connect to the Bluetooth Devices by themselves, even when my own application is terminated. Sometimes the Windows 8.1 device will also show the Bluetooth device as connected, while the device visually shows that it&#39;s not connected anymore. The only way to reconnect the Bluetooth device is to unpair it and shutdown/restart Bluetooth on the Windows device.

Whenever I try to make a new call to `DeviceInformation` after a failed connect it will refuse to return the device that I earlier tried to connect.

    &gt; Message: The service cannot be found in the specified name space.

Odd result, the 1.2 devices work perfectly.

Manifest File:

    &lt;m2:DeviceCapability Name=&quot;bluetooth.rfcomm&quot;&gt;
      &lt;m2:Device Id=&quot;any&quot;&gt;
        &lt;m2:Function Type=&quot;serviceId:00001101-0000-1000-8000-00805F9B34FB&quot;/&gt;
      &lt;/m2:Device&gt;
    &lt;/m2:DeviceCapability&gt;

Selecting Device:

    Guid RfcommChatServiceUuid = Guid.Parse(&quot;00001101-0000-1000-8000-00805F9B34FB&quot;);
    await DeviceInformation.FindAllAsync(RfcommDeviceService.GetDeviceSelector(RfcommServiceId.FromUuid(RfcommChatServiceUuid)));

Connecting:(id = chatserviceid)

    StreamSocket _socket;    
    RfcommDeviceService service = await RfcommDeviceService.FromIdAsync(deviceInformation1._id);
    await _socket.ConnectAsync(service.ConnectionHostName, service.ConnectionServiceName);

Disconnecting:

    this._socket.Dispose();
    this._socket = null;

I&#39;ve researched the MSDN, code samples, demo&#39;s, channel-9 video&#39;s and StackOverflow, no resource can tell me if there are issues with `Windows.Devices.Bluetooth.Rfcomm`.

Is there someone who recognizes these odd results? Am I doing something wrong? 

- [Similar problem was observed here][1]

- [Link to MSDN issue][2]

UPDATE: Working with Windows Phone 8.1 GDR2 is a possible solution. 

NOTE: For myself and several other people this update still gives the same issues.


  [1]: https://stackoverflow.com/questions/27122484/rfcomm-connection-works-unstable/
  [2]: https://social.msdn.microsoft.com/Forums/windowsapps/en-US/c2d2cc7a-b966-42b2-9c04-835b125b404e/disconnecting-bluetooth-devices-with-windowsdevicesbluetoothrfcomm?forum=wpdevelop

(Dis)Connecting bluetooth devices with Windows.Devices.Bluetooth.Rfcomm (WP8.1)

This code:

    string a = &quot;abc&quot;;
    string b = &quot;A&#131603;C&quot;;
    Console.WriteLine(&quot;Length a = {0}&quot;, a.Length);
    Console.WriteLine(&quot;Length b = {0}&quot;, b.Length);

outputs:

    Length a = 3
    Length b = 4

Why? The only thing I could imagine is that the Chinese character is 2 bytes long and that the `.Length` method returns the byte count.

Why is the length of this string longer than the number of characters in it?

I&#39;m building a set of code diagnostics using Roslyn (in VS2015 Preview). Ideally, I&#39;d like any errors they produce to act as persistent errors, just as if I were violating a normal language rule.

There are a bunch of options, but I&#39;m having a hard time getting any of them to work consistently. I&#39;ve managed to implement a rudimentary syntax node action, i.e. one registered with 

    context.RegisterSyntaxNodeAction(AnalyzeSyntaxNode, SyntaxKind.InvocationExpression);

in the `Initialize` method of my diagnostic class. Lo and behold, when I open up a file which violates this diagnostic (while running the VSIX project), VS2015 shows an error:

- Red squiggle under the right bit of code
- Red block in the margin
- Error in the error list

However, the error goes away when I close the file.

I&#39;ve tried using `context.RegisterCompilationEndAction` as well, but this has two problems:

- It seems to fire inconsistently. *Usually* when I open the solution it fires, but not always. It doesn&#39;t fire on a clean/rebuild, which seems odd.
- Although diagnostics created *directly* in the analysis method fire, in order to implement the diagnostics I&#39;m using a visitor, like this - which may be inept:

        private static void AnalyzeEndCompilation(CompilationEndAnalysisContext context)
        {
            foreach (var tree in context.Compilation.SyntaxTrees)
            {
                var visitor = new ReportingVisitor(context.Compilation.GetSemanticModel(tree));
                visitor.Visit(tree.GetRoot());
                foreach (var diagnostic in visitor.Diagnostics)
                {
                    context.ReportDiagnostic(diagnostic);
                }
            }
        }

 I know that the diagnostics are being created - a breakpoint on the `ReportDiagnostic` line is hit several times - but I&#39;m not seeing anything in the error list. (Whereas a similar `ReportDiagnostic` call at the start of the method, or one per syntax tree with the file path, *does* get shown.)

What am I doing wrong here? The first approach (a syntax node action) would be ideal if feasible - it gives me exactly the context I need. Is there some setting in the project properties that I need to make the compiler use that for &quot;full project&quot; compilation as well as just interactive &quot;in the IDE&quot; handling? Is this perhaps just a bit of Roslyn integration which isn&#39;t quite finished yet?

(I can include the full code for the class if it would be useful - in this case I suspect it would be more noise than signal though.)

How can I make my code diagnostic syntax node action work on closed files?

Creating a plain C# Console App in Visual Studio 2015 Preview, we get a pseudo reference named &quot;Analyzers&quot;:

&lt;br /&gt;

![Expanded Solution Explorer project &quot;References&quot; showing &quot;Analyzers&quot; entry][1]

**What does the &quot;Analyzers&quot; reference just above mean?**

The project file has nothing inside and the properties window shows nothing (completely blank) about this entry (though, in contrast to &quot;reference properties&quot; it says &quot;folder properties&quot; in the header, but that does not say much).

I would expect this to be related to Roslyn, but I have no idea. I have ReSharper installed, but I don&#39;t assume it has anything to do with it.


  [1]: http://i.stack.imgur.com/wwuIt.jpg

**Edit 6.8.2016**

The accepted answer explains the tooling provided by analyzers, but leaves open why a *development tool* becomes a (runtime?) reference. Actually it is not a runtime reference, unlike the other references. So the answer to this miracle is Hans Passants comment below:

&gt; They picked a clumsy place to add the code analyzers feature, they just couldn&#39;t find a better place without drastically overhauling the solution explorer and nuget. – Hans Passant May 26 &#39;15 at 8:59

Visual Studio 2015 - What does the &quot;Analyzers&quot; reference mean?

There&#39;s a [similar post][1] on stack but it doesn&#39;t help with my issue possibly because I am using Visual Studio 2015.

How do I get the &quot;Enable NuGet Package Restore&quot; option to appear in VS2015?

I chose File &gt; New Project and created an **empty ASP.NET Web Application**. I&#39;m looking for this menu option.

![enter image description here][2]

I should mention that I have looked for any pre-existing nuGet files in my project folder and there are none.

  [1]: https://stackoverflow.com/questions/15435366/vs2012-enable-nuget-package-restore-disappears-missing
  [2]: http://i.stack.imgur.com/uedbb.png

How do I enable NuGet Package Restore in Visual Studio?

I am testing Visual Studio 2015 with C# 6.0 but the language features are not working. In an MVC web application, the following code does compile:

    if (!string.IsNullOrWhiteSpace(Model.Profile?.TypeName))
    {
        // More logic here...
    }

However, when I run the application via Debug and IIS Express, I get the following error:

&gt; CS1525: Invalid expression term &#39;.&#39;

How do I enable these features?

C# 6.0 Features Not Working with Visual Studio 2015

While uninstalling Microsoft Visual Studio Ultimate 2015 Preview, it throws an error quoting &quot;Microsoft Visual Studio Ultimate 2015 Preview has stopped working&quot;

Message Content Include: 

&gt; A problem caused the program to stop working correctly. Windows will
&gt; close the program and notify you if a solution is available.

I googled and found a utility that uninstalls visual studio 2010 [here][1] but nothing exists for Visual Studio 2012, 2013 and 2015. My questions are:

Is there any generic utility that uninstalls Visual Studio by Version ? 

Or Is there a way to forcefully uninstall visual studio 2012 onward without using the Program and Features menu?

  [1]: http://blogs.msdn.com/b/heaths/archive/2014/08/20/visual-studio-2010-uninstall-utility-back-online.aspx

Force uninstall of Visual Studio

I was going through the latest features introduced in C# 6.0 and just followed an example of auto property initializer,  

    class NewSample
    {
        public Guid Id { get; } = Guid.NewGuid();
    }

but my IDE did not recognize the syntax.

I am wondering how I could enable C# 6.0 in Visual Studio 2013. The Target framework I am using is 4.5.1.

How to enable C# 6.0 feature in Visual Studio 2013?

In a recent past there has been a lot of talk about whats new in C# 6.0&lt;br&gt;
One of the most talked about feature is using `Dictionary` initializers in C# 6.0&lt;br&gt;
But wait we have been using collection initializers to initialize the collections and can very well initialize a `Dictionary` also in .NET 4.0 and .NET 4.5 (Don&#39;t know about old version) like

    Dictionary&lt;int, string&gt; myDict = new Dictionary&lt;int, string&gt;() {
        { 1,&quot;Pankaj&quot;},
        { 2,&quot;Pankaj&quot;},
        { 3,&quot;Pankaj&quot;}
    };

So what is there new in C# 6.0, What Dictionary Initializer they are talking about in C# 6.0

What benefits does dictionary initializers add over collection initializers?

In the C# 6, you can can simplify implementing a property by using a getter-only auto property. For example, if I were implementing the abstract `Stream` class:


    public override bool CanRead { get; } = true;

However I can also write it with an expression body, also new in C# 6:

    public override bool CanRead =&gt; true;

What is the difference between the two, and when should I use one or the other?

What is the difference between getter-only auto properties and expression body properties?

With C# 6.0 in the VS2015 preview we have a new operator, **`?.`**, which can be used like this:

&lt;!-- language: lang-cs --&gt;

    public class A {
       string PropertyOfA { get; set; }
    }

    ...

    var a = new A();
    var foo = &quot;bar&quot;;
    if(a?.PropertyOfA != foo) {
       //somecode
    }

What exactly does it do?

Content Type	Original Author	Original Content on Stackoverflow
Question	Matko	View Question on Stackoverflow
Solution 1 - C#	Jon Skeet	View Answer on Stackoverflow

Primary constructors no longer compile in VS2015

C# Problem Overview

C# Solutions

Solution 1 - C#

Laravel: Where to store global arrays data and constants?

Programmatically set image to UIImageView with Xcode 6.1/Swift

Attributions