Visual Studio Code Analysis has been merged with Intellisense and can now be viewed from the Error window. When you select &quot;Build+Intellisense&quot; or &quot;Intellisense&quot; your code analysis warnings will show up there. You no longer need to build your solution to see them there.

This is one of the perks of the new Roslyn based editor.

[![enter image description here][1]][1]

Setting it to Intellisense Only should show you your code Analysis Warnings and on the left there is now an option to select &quot;Entire Solution&quot;, &quot;Current Project&quot;, &quot;Current Document&quot; or &quot;Open documents&quot;.

I personally really like the last option, as it works really well for people wanting to leave the campground cleaner than they found it.

If you add additional analyzers (through a vsix or Nuget), they show up as additional rules for Code Analysis.

You can add the &quot;Category&quot; column:
[![enter image description here][2]][2]

And then filter by category:
[![enter image description here][3]][3]


  [1]: http://i.stack.imgur.com/DOrqI.png
  [2]: http://i.stack.imgur.com/o08Py.png
  [3]: http://i.stack.imgur.com/14wPi.png

I have a method with the following overloads:

    string Call(string function, Dictionary&lt;string, object&gt; parameters, object body)
    string Call(string function, Dictionary&lt;string, object&gt; parameters, JObject body)

Now I added another overload:

    string Call(string function)
    {
        return Call(function, null, (JObject) null);
    }

I added a cast to `JObject` so the compiler knows which overload it should use. But Visual Studio tells me that the cast is redundant. But why isn&#39;t my call ambiguous without the cast?

Why is this cast redundant?

How to added password validation rule in the validator?

**Validation rule:**

The password contains characters from at least three of the following five categories:

 - English uppercase characters (A – Z)
 - English lowercase characters (a – z)
 - Base 10 digits (0 – 9)
 - Non-alphanumeric (For example: !, $, #, or %)
 - Unicode characters

How to add above rule in the validator rule?

**My Code Here**

    // create the validation rules ------------------------
        $rules = array(
            &#39;name&#39;             =&gt; &#39;required&#39;,                        // just a normal required validation
            &#39;email&#39;            =&gt; &#39;required|email|unique:ducks&#39;,     // required and must be unique in the ducks table
            &#39;password&#39;         =&gt; &#39;required&#39;,
            &#39;password_confirm&#39; =&gt; &#39;required|same:password&#39;           // required and has to match the password field
        );
    
        // do the validation ----------------------------------
        // validate against the inputs from our form
        $validator = Validator::make(Input::all(), $rules);
    
        // check if the validator failed -----------------------
        if ($validator-&gt;fails()) {
    
            // get the error messages from the validator
            $messages = $validator-&gt;messages();
    
            // redirect our user back to the form with the errors from the validator
            return Redirect::to(&#39;home&#39;)
                -&gt;withErrors($validator);
    
        }

Laravel password validation rule

In Visual Studio 2013, I used the Code Analysis window to provide reports to both the Development and Management teams.

[![Code Analysis window in Visual Studio 2013][1]][1]

In Visual Studio 2015 Enterprise RTM, these errors have returned to the error window and I can no longer just see CA issues for a single project, or filter them by type.

Is there a way to bring the Code Analysis window back? 

  [1]: http://i.stack.imgur.com/5aeI7.png

Where has the Code Analysis window gone?

In Visual Studio 2013, I used the Code Analysis window to provide reports to both the Development and Management teams.
<a href="http://i.stack.imgur.com/5aeI7.png" target="_blank" rel="noopener noreferrer"><img src="http://i.stack.imgur.com/5aeI7.png" alt="Code Analysis window in Visual Studio 2013"></a>
In Visual Studio 2015 Enterprise RTM, these errors have returned to the error window and I can no longer just see CA issues for a single project, or filter them by type.
Is there a way to bring the Code Analysis window back?

After upgrading my WinForms VS2013 project to VS2015, I started seeing the MSB3884 &quot;Could not find rule set file&quot; warning.

A Google search turned up one MSDN article, which a Stack Overflow article points to as well as numerous other sites.

Similar Question: [33020507][1]
MSDN: [VS2015 MSB3884 Warning][2]

I have both VS2013 and VS2015 installed.

The project files giving the warnings (and those that do not), do not have these entries.

    &lt;CodeAnalysisRuleSetDirectories&gt;
    &lt;CodeAnalysisRuleDirectories&gt; 

If I delete the other two entries from the project file, then the problem goes away, which is obvious, as there is no rule file set.

    &lt;CodeAnalysisIgnoreBuiltInRuleSets&gt; 
    &lt;CodeAnalysisIgnoreBuiltInRules&gt;

I am trying to build externally using msbuild, however VS2015 tends to show the problem too.

Interestingly enough, if I click on the open button in the project properties Code Analyzer area, I do get the file.

Specifying a different rule set makes no difference. That makes me think that possibly, there is an environment variable setting, not that any come to mind. Code Analyzers is a function of the project file. I can add a directory attribute, but the consensus is to take out paths, the `&lt;CodeAnalysisRule*Directories&gt;`.

The GUI uses defaults:

[![VS2015 Project Properties Code Analysis tab][3]][3]&#39;

Here is a typical project file fragment.

      &lt;PropertyGroup Condition=&quot;&#39;$(Configuration)|$(Platform)&#39; == &#39;Debug|x86&#39;&quot;&gt;
        &lt;DebugSymbols&gt;true&lt;/DebugSymbols&gt;
        &lt;OutputPath&gt;bin\x86\Debug\&lt;/OutputPath&gt;
        &lt;DefineConstants&gt;TRACE;DEBUG&lt;/DefineConstants&gt;
        &lt;DebugType&gt;full&lt;/DebugType&gt;
        &lt;PlatformTarget&gt;x86&lt;/PlatformTarget&gt;
        &lt;CodeAnalysisIgnoreBuiltInRuleSets&gt;true&lt;/CodeAnalysisIgnoreBuiltInRuleSets&gt;
        &lt;CodeAnalysisIgnoreBuiltInRules&gt;false&lt;/CodeAnalysisIgnoreBuiltInRules&gt;
        &lt;Prefer32Bit&gt;false&lt;/Prefer32Bit&gt;
        &lt;TreatWarningsAsErrors&gt;true&lt;/TreatWarningsAsErrors&gt;
        &lt;CodeAnalysisRuleSet&gt;BasicCorrectnessRules.ruleset&lt;/CodeAnalysisRuleSet&gt;
      &lt;/PropertyGroup&gt;
      &lt;PropertyGroup Condition=&quot;&#39;$(Configuration)|$(Platform)&#39; == &#39;Debug|x64&#39;&quot;&gt;
        &lt;DebugSymbols&gt;true&lt;/DebugSymbols&gt;
        &lt;OutputPath&gt;bin\x64\Debug\&lt;/OutputPath&gt;
        &lt;DefineConstants&gt;TRACE;DEBUG&lt;/DefineConstants&gt;
        &lt;DebugType&gt;full&lt;/DebugType&gt;
        &lt;PlatformTarget&gt;x64&lt;/PlatformTarget&gt;
        &lt;CodeAnalysisRuleSet&gt;MinimumRecommendedRules.ruleset&lt;/CodeAnalysisRuleSet&gt;
        &lt;CodeAnalysisIgnoreBuiltInRules&gt;false&lt;/CodeAnalysisIgnoreBuiltInRules&gt;
      &lt;/PropertyGroup&gt;

Without getting rid of the Code Analysis lines from the project file, though saving a project file again would just add it back, how can I eliminate/fix the warning?


  [1]: https://stackoverflow.com/questions/33020507/vs2015-msb3884-warning-could-not-find-rule-set-file
  [2]: https://social.msdn.microsoft.com/Forums/office/en-US/c6eea146-81f4-4d68-8886-e4433359bbdf/vs2015-msb3884-warning?forum=msbuild
  [3]: http://i.stack.imgur.com/9cAin.png

VS2015: warning MSB3884: Could not find rule set file

While searching through a Python project, I found a few lines commented with `# noqa`.


    import sys
    sys.path.append(r&#39;C:\dev&#39;)
    import some_module   # noqa


What does `noqa` mean in Python? Is it specific to Python only?

What does &#39;# noqa&#39; mean in Python comments?

I know where to find the [_C# 5 Language Specification_](https://stackoverflow.com/questions/13467103/where-can-i-find-the-c-sharp-5-language-specification) but I cannot find the C# 6 Language Specification anywhere. 

_Where is the **C# 6** Language Specification?_

Where Can I Find the C# Language Specification 6.0?

After installing Visual Studio 2015 and running CMake on a previous project, CMake errors stating that it could not find the C compiler.

    The C compiler identification is unknown
    The CXX compiler identification is unknown
    CMake Error at CMakeLists.txt:4 (PROJECT):
      No CMAKE_C_COMPILER could be found.

    CMake Error at CMakeLists.txt:4 (PROJECT):
      No CMAKE_CXX_COMPILER could be found.

I went searching for `cl.exe` in the Visual Studio folder,`C:\Program Files\Microsoft Visual Studio 14.0`, and could not find it.  

How do I set up CMake to work on Windows with Visual Studio 2015?


CMake does not find Visual C++ compiler

I just recently downloaded and installed Visual Studio Professional 2015 (14.0.23107.0). The first time I opened up our solution (28 projects) and performed a Build -&gt; Rebuild Solution, my development machine came to an absolute crawl. The CPU was maxed out at 100% and the build never completed - even after &gt; 10 minutes.

I opened up Windows Task Manager and noticed: &gt; 10 VBCSCompiler.exe tasks running. When combined, these tasks sent the CPU &gt; 90%.

Any idea why there are so many of these tasks running? Any way to stop this from happening?

This is the closest thing I can find to someone else experiencing the same issue: https://github.com/dotnet/roslyn/issues/2790

**Update (8/7)**

-Hans Passant, great thought. My manager provided me with this release (14.0.23107.0). Is this the correct version for the &quot;official release&quot;?? I did not knowingly install any of the per-release versions of Visual Studio 2015. I don&#39;t think there are any beta bits lying around.

-Kyle Trauberman, I&#39;m not that familiar with environment variables in the context of Visual Studio; however, I naively ran `set DisableRosyln=true` in a VS (and MSBuild) Command Prompt Window. This did not seem to have any impact. VBCSCompiler.exe showed right back up even after restarting VS2015.

I repaired my VS2015 install and performed a reboot. This did not help.

**Update Part 2 (8/7)**
-Hans Passant, very impressive write up!! Although, the problem didn&#39;t happen this time around, I took a look at the things you described:

As far as the modules loaded with the VBCSCompiler.exe, here&#39;s what I have:

[![enter image description here][1]][1]

It&#39;s interesting that our .NET core assemblies are at different versions. You&#39;re at 4.06.79 while, I&#39;m at 4.06.81.

My &quot;client side dlls&quot; (located at C:\Program Files (x86)\MSBuild\14.0\Bin\Microsoft.Build.Tasks.CodeAnalysis.dll) are at the same version and time stamp as yours:
[![enter image description here][2]][2]

Oddly enough, when I look at the code in ILSpy, I see something slightly different - optimization perhaps?

        private static NamedPipeClientStream TryAllProcesses(string pipeName, int timeoutMs, CancellationToken cancellationToken, out string newPipeName)
    {
    	string str = pipeName;
    	int num = 1;
    	while (File.Exists(string.Format(&quot;\\\\.\\pipe\\{0}&quot;, pipeName)))
    	{
    		NamedPipeClientStream result;
    		if ((result = BuildClient.TryConnectToProcess(pipeName, timeoutMs, cancellationToken)) != null)
    		{
    			newPipeName = pipeName;
    			return result;
    		}
    		pipeName = str + &quot;.&quot; + num.ToString(CultureInfo.InvariantCulture);
    		num++;
    	}
    	newPipeName = pipeName;
    	return null;
    }

**Let me get back with you on the specific pipname argument passed to the instances of VBCSCompiler.exe. I will have to wait until it happens again.

  [1]: http://i.stack.imgur.com/rPd61.png
  [2]: http://i.stack.imgur.com/kcXmI.png

Numerous instances of VBCSCompiler.exe

When attempting to build in visual studio 2015, the following file is missing? This project was previously being built in VS2013.

&gt; Severity	Code	Description	Project	File	Line Error		The task factory
&gt; &quot;CodeTaskFactory&quot; could not be loaded from the assembly &quot;C:\Program
&gt; Files (x86)\MSBuild\14.0\bin\Microsoft.Build.Tasks.v14.0.dll&quot;. Could
&gt; not load file or assembly &#39;file:///C:\Program Files
&gt; (x86)\MSBuild\14.0\bin\Microsoft.Build.Tasks.v14.0.dll&#39; or one of its
&gt; dependencies. The system cannot find the file specified.	&lt;Project
&gt; Name&gt;



Can&#39;t build in visual studio 2015 because &#39;Microsoft.Build.Tasks.v14.0.dll&#39; cannot be found

I just upgraded from Visual Studio 2013 to 2015 and now I am having trouble with breakpoints.

It&#39;s a hit or a miss where break points will actually work and if I set one while debugging I get the error:

&gt;The breakpoint failed to bind.

Any help would be appreciated. I am about ready to give up on 2015 and go back.

Breakpoint Failed to Bind - Visual Studio 2015

After I have migrated my project from VS2013 to VS2015 the project no longer builds.  A compilation error occurs in the following LINQ statement:

    static void Main(string[] args)
    {
        decimal a, b;
        IEnumerable&lt;dynamic&gt; array = new string[] { &quot;10&quot;, &quot;20&quot;, &quot;30&quot; };
        var result = (from v in array
                      where decimal.TryParse(v, out a) &amp;&amp; decimal.TryParse(&quot;15&quot;, out b) &amp;&amp; a &lt;= b // Error here
                      orderby decimal.Parse(v)
                      select v).ToArray();
    }

The compiler returns an error:

&gt; Error CS0165  Use of unassigned local variable &#39;b&#39;

What causes this issue?  Is it possible to fix it through a compiler setting?

Roslyn failed to compile code

I was writing a unit test on a piece of code that returned JSON. The type that it returns is an anonymous type, so I thought to verify the values on it I&#39;d just cast the object to a `dynamic` to do my assertions.

However, when I do that, my build fails but I don&#39;t have any error messages. I was able to reproduce this with very simple code in a new Unit Test Project:

    [TestMethod]
    public void TestMethod1()
    {
        var obj = new { someValue = true };

        dynamic asDynamic = obj;

        Assert.IsTrue(asDynamic.someValue);
    }

See below for a screenshot of the build failing

[![build failing][1]][1]

The build succeeds when I comment out the assertion though:

[![build succeeding without assert][2]][2]

In contrast, I ran the following code in LinqPad 5 beta (which uses the Roslyn compiler) and had no issues:

    var obj = new { someValue = true };
    dynamic asDynamic = obj;
    Console.WriteLine((asDynamic.someValue == true).ToString());

&gt;True

What&#39;s going on here? Since the error isn&#39;t showing I can&#39;t tell if I&#39;m using `dynamic` incorrectly, or if it can&#39;t find the overload to use for `IsTrue()` because of the `dynamic`, or if this is a bug in the compiler (though I highly doubt this, I don&#39;t have any evidence that there&#39;s something wrong with my code).

Regarding the overload issue, I tried `Assert.IsTrue((bool)asDynamic.someValue);` but the build still fails, still no error message.

Per @RonBeyer&#39;s comment, I had also tried more casting such as below to no avail:

        dynamic asDynamic = (dynamic)obj;
        Assert.IsTrue(((dynamic)asDynamic).someValue);

        Assert.IsTrue((bool)asDynamic.somevalue);

Upon closer inspection, I found that there was an error listed in the Output window:


&gt; c:\...\DynamicBuildFailTest\UnitTest1.cs(16,33,16,42): error CS0656: Missing compiler required member &#39;Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create&#39;

Okay, VS2013 is better at reporting the errors, I will search based on those:

[![enter image description here][3]][3]

Okay, [adding a reference to Microsoft.CSharp fixed the build error](https://stackoverflow.com/a/13568247/526704), but I will leave this question open because it&#39;s presumably an issue with VS2015 that (in my mind) should be resolved.

  [1]: http://i.stack.imgur.com/pxQnz.png
  [2]: http://i.stack.imgur.com/PYKCt.png
  [3]: http://i.stack.imgur.com/TClxn.png

VS2015 build fails with no error message with Dynamic

I want to use C# 6 in my project (null propagation, other features).

I&#39;ve installed VS 2015 on my PC and it works brilliantly and builds test code like

    var user = new SingleUserModel(); //all model fields are null
	var test = user.User?.Avatar?[&quot;blah&quot;];
But when I push my project to the repo and CI starts to build it, build fails because of unsupported `?`.

I&#39;ve installed VS2015 on CI server too but looke like it doesn&#39;t use it.
What can I do?

CI - CruiseControl .NET
Builds with `C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe`

How to upgrade msbuild to C# 6?

I am trying to create web application using Visual Studio 2015 and .NET 4.5.1.
When I publish the website, visual studio create folder named `roslyn`.

[![enter image description here][1]][1]

I know it&#39;s used to compile code on the fly, but unfortunately my hosting provider doesn&#39;t allow me to execute the compiler on their server.

How to publish the website without `roslyn` like previous version of Visual Studio?

EDIT:
I got this error when trying to acces my website.

[![enter image description here][2]][2]

It seems IIS trying to execute `roslyn\csc.exe` but my user account doesn&#39;t have permission to do that. With previous version of Visual Studio, this error doesn&#39;t show up.

  [1]: http://i.stack.imgur.com/s5UTs.png
  [2]: http://i.stack.imgur.com/QeBoa.png

Content Type	Original Author	Original Content on Stackoverflow
Question	NikolaiDante	View Question on Stackoverflow
Solution 1 - Code Analysis	jessehouwing	View Answer on Stackoverflow

Where has the Code Analysis window gone?

Code Analysis Problem Overview

Code Analysis Solutions

Solution 1 - Code Analysis

Laravel password validation rule

Why is this cast redundant?

Attributions