Click the project node in the Solution Explorer. Then look in the Property Grid (F4). You&#39;ll see a property named &quot;C# Language Level&quot;. Set that to &quot;Default&quot; or your desired language level.

![enter image description here][1]


  [1]: http://i.stack.imgur.com/ejijW.png

TO disable it at once across the solution rather than per project level, please add below in `.sln.DotSettings` 

    &lt;s:String x:Key=&quot;/Default/CodeInspection/CSharpLanguageProject/LanguageLevel/@EntryValue&quot;&gt;CSharp50&lt;/s:String&gt;

it would disable resharper 6.0 features/give you error

**EDIT**

as per comments, in case you dont have the `sln.DotSettings` file at all, then you need to create one with below contents

    &lt;wpf:ResourceDictionary xml:space=&quot;preserve&quot; xmlns:x=&quot;http://schemas.microsoft.com/winfx/2006/xaml&quot; xmlns:s=&quot;clr-namespace:System;assembly=mscorlib&quot; xmlns:ss=&quot;urn:shemas-jetbrains-com:settings-storage-xaml&quot; xmlns:wpf=&quot;http://schemas.microsoft.com/winfx/2006/xaml/presentation&quot;&gt; 
        &lt;s:String x:Key=&quot;/Default/CodeInspection/CSharpLanguageProject/LanguageLevel/@EntryValue&quot;&gt;‌​CSharp50&lt;/s:String&gt;
    &lt;/wpf:ResourceDictionary&gt;



I&#39;m using `homebrew` and `oh-my-zsh` on a fresh OSX 10.10.1 install. I got `nvm` via `homebrew` and then attempted to run it but says - *zsh: command not found: nvm*

Any idea what the problem is? I was able to install and use git just fine...

![enter image description here][1]


![enter image description here][2]


----------
**UPDATED 9/20/2019**

As stated by more recent answers from [DarkPurple141][3] and [Elise van Looij][4]. `nvm` doesn&#39;t appear to be compatible with `homebrew`. This is also stated in the official nvm-sh repo located [here][5].

&gt; Homebrew installation is not supported. If you have issues with
&gt; homebrew-installed nvm, please brew uninstall it, and install it using
&gt; the instructions below, before filing an issue.
&gt; 
&gt; Note: If you&#39;re using zsh you can easily install nvm as a zsh plugin.
&gt; Install zsh-nvm and run nvm upgrade to upgrade.

The following steps should help:

 1. $ `brew uninstall nvm`
 2. $ `brew cleanup` (just for good measure)
 3. $ `curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash`
 4. Check that nvm was installed correctly by running $ `command -v nvm`. 
    
    4.a If the response is anything other than $ `nvm`, add the following two lines to the ~/.bash-profile file:
        `export NVM_DIR=~/.nvm`
        `source ~/.nvm/nvm.sh`
    4.b Restart your computer (you can try closing Terminal and restarting it first)
    4.c $ `command -v nvm should now return `nvm`
    
 5. Now update Node.js with $ `nvm install --lts` 
 6. Update npm: $ `nvm install-latest-npm`
 7. $ `npm install --global mocha`. Finally, success! Well, for me and I hope for you too.



  [1]: http://i.stack.imgur.com/9OyhP.png
  [2]: http://i.stack.imgur.com/dBjOx.png
  [3]: https://stackoverflow.com/users/7650430/darkpurple141
  [4]: https://stackoverflow.com/users/126126/elise-van-looij
  [5]: https://github.com/nvm-sh/nvm#installation-and-update

Homebrew installs nvm but nvm can&#39;t be found afterwards?

I&#39;m currently in the process of learning how to convert my app to Material design and I&#39;m a bit stuck right now. I&#39;ve got the Toolbar added and I have made my navigation drawer overlay all the content.&lt;br&gt;&lt;br&gt;I&#39;m now trying to create an expandable search that looks like the one in the [material guidelines][1]:
![enter image description here][2]&lt;br&gt;&lt;br&gt;
This is what I&#39;ve got right now and I can&#39;t figure out how to make it like the above:  
![My search][3]

This is my menu xml:
    
    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;&gt;
        &lt;item
            android:id=&quot;@+id/action_search&quot;
            android:icon=&quot;@android:drawable/ic_menu_search&quot;
            android:title=&quot;Search&quot;
            app:showAsAction=&quot;always&quot;
            app:actionViewClass=&quot;android.support.v7.widget.SearchView&quot; /&gt;
    &lt;/menu&gt;

That works, I get a menu item that expands to the SearchView and I can filter my list fine. It doesn&#39;t look anything like the 1st picture though.&lt;br&gt;&lt;br&gt;
I tried to use `MenuItemCompat.setOnActionExpandListener()` on `R.id.action_search` so I could change the home icon to a back arrow, but that doesn&#39;t seem to work. Nothing gets fired in the listener. Even if that worked it still wouldn&#39;t be very close to the 1st image.&lt;br&gt;&lt;br&gt;
How do I create a SearchView in the new appcompat toolbar that looks like the material guidelines?


  [1]: http://www.google.co.uk/design/spec/patterns/search.html#search-in-app-search
  [2]: http://i.stack.imgur.com/s3F67.png
  [3]: http://i.stack.imgur.com/UMI0p.png

Creating a SearchView that looks like the material design guidelines

While using ReSharper, it suggested &quot;Enable C# 6.0 support for this project&quot;. I foolishly clicked on it, and now as advertised it&#39;s giving me suggestions for C# 6.0 - which then give me errors as I am not using C# 6.0 in this project.

How can I disable C# 6.0 support, returning it to how it was before? (Preferably without having to individually ignore specific suggestions)

Disable C# 6.0 Support in ReSharper

<p>While using ReSharper, it suggested "Enable C# 6.0 support for this project". I foolishly clicked on it, and now as advertised it's giving me suggestions for C# 6.0 - which then give me errors as I am not using C# 6.0 in this project.</p>
<p>How can I disable C# 6.0 support, returning it to how it was before? (Preferably without having to individually ignore specific suggestions)</p>


I create new asp.net mvc project in visual studio 2015.The project has a wwwroot file.What is this? 
![enter image description here][1]


  [1]: http://i.stack.imgur.com/Tdm6h.png

What is wwwroot in asp.net vnext

I&#39;m making an application in Xamarin forms but I have some trouble sticking a layout to the bottom of the device. I thought an AbsoluteLayout would work, but I cannot grasp how it works. So I made a RelativeLayout which I filled with the elements I wanted to fill but now I cannot seem to get it working on sticking to the bottom of the device at all time. 

Below is a screenshot to make things hopefully a little bit more clear.
I have a stacklayout which I fill with the headerlayout and the contentlayout. But if I just add the footerlayout to the stacklayout, it will not be sticked to the bottom of the page but (logically) just behind the previous child. Now I think an Absolutelayout would do the trick, but I cannot seem to grasp the functionality and the Layoutflags and bounds of it. Could someone help me out?

![My application][1]


  [1]: http://i.stack.imgur.com/Tzgqz.png

Stick Layout in Xamarin Forms to bottom

I am attempting to publish and consume versioned NuGet packages of class libraries while avoiding headaches for local development. Here is a sample Visual Studio solution layout:

    | Libraries
      | LibraryA
      | LibraryB
      | LibraryC
    | Applications
      | ApplicationD
      | ApplicationE

This is a single solution containing both shared class libraries and multiple applications. Currently references to the class libraries by the applications are local in-solution references.

What I would like to do is to publish the libraries (A,B,C) as versioned NuGet packages which are then referenced by the applications as needed (D,E). This allows a change to a shared library to be independent from an update to an application which is deployed. Without this, changing one library could cause the binaries to change in a dozen or more applications, all of which would technically need to be tested. This is undesirable, and versioning with NuGet fixes this.

However, let us say that I want to update the content of LibraryA and ApplicationD at the same time. In order to do this after we have switched to NuGet, I will have to make changes to LibraryA, commit them, wait for the package to be created, tell ApplicationD to update its reference to LibraryA, and then test or develop in ApplicationD. This is far more complicated than simply working with both at the same time using local in-solution references.

What is a better way to get both the robustness of versioned NuGet packages for my shared class libraries while also keeping development simple even if it spans over multiple projects and applications? The only other solutions I have found all involve too much overhead or headache, such as having to constantly change the references for ApplicationD between the NuGet package and the local project.

**EDIT:** To clarify the premise, this question assumes the following:

 - The architecture (solution and project organization) cannot be significantly reorganized
 - Shared libraries are going to change at a non-trivial frequency
 - Changing a shared library cannot force any application to be updated
 - Applications can reference different versions of shared libraries

Pain-free local development while also referencing NuGet packages

I am using the [`System.Net.Http.HttpClient`][1] to do some client-side HTTP communication. I&#39;ve got all of the HTTP in one spot, abstracted away from the rest of the code. In one instance I want to read the response content as a stream, but the consumer of the stream is well insulated from where the HTTP communication happens and the stream is opened. In the spot responsible for HTTP communication I am disposing of all of the `HttpClient` stuff.

This unit test will fail at `Assert.IsTrue(stream.CanRead)`:

    [TestMethod]
    public async Task DebugStreamedContent()
    {
        Stream stream = null; // in real life the consumer of the stream is far away 
        var client = new HttpClient();        
        client.BaseAddress = new Uri(&quot;https://www.google.com/&quot;, UriKind.Absolute);
        
        using (var request = new HttpRequestMessage(HttpMethod.Get, &quot;/&quot;))
        using (var response = await client.SendAsync(request))
        {
            response.EnsureSuccessStatusCode();
            //here I would return the stream to the caller
            stream = await response.Content.ReadAsStreamAsync();
        }
        
        Assert.IsTrue(stream.CanRead); // FAIL if response is disposed so is the stream
    }

I typically try to dispose of anything `IDisposable` at the earliest possible convenience but in this case, disposing the `HttpResponseMessage` also disposes the `Stream` returned from `ReadAsStreamAsync`.

So it seems like the calling code needs to know about and take ownership of the response message as well as the stream, or I leave the response message undisposed and let the finalizer deal with it. Neither option feels right. 

[This answer][2] talks about not disposing the `HttpClient`. How about the `HttpRequestMessage` and/or `HttpResponseMessage`?

Am I missing something? I am hoping to keep the consuming code ignorant of HTTP  but leaving all these undisposed objects around goes against year of habit!


  [1]: http://msdn.microsoft.com/en-us/library/system.net.http.httpclient(v=vs.118).aspx
  [2]: https://stackoverflow.com/questions/15705092/do-httpclient-and-httpclienthandler-have-to-be-disposed

When or if to Dispose HttpResponseMessage when calling ReadAsStreamAsync?

I am creating a class that has a series of events, one of them being `GameShuttingDown`. When this event is fired, I need to invoke the event handler. The point of this event is to notify users the game is shutting down and they need to save their data. The saves are awaitable, and events are not. So when the handler gets called, the game shuts down before the awaited handlers can complete.



    public event EventHandler&lt;EventArgs&gt; GameShuttingDown;

    public virtual async Task ShutdownGame()
    {
        await this.NotifyGameShuttingDown();

        await this.SaveWorlds();

        this.NotifyGameShutDown();
    }

    private async Task SaveWorlds()
    {
        foreach (DefaultWorld world in this.Worlds)
        {
            await this.worldService.SaveWorld(world);
        }
    }

    protected virtual void NotifyGameShuttingDown()
    {
        var handler = this.GameShuttingDown;
        if (handler == null)
        {
            return;
        }

        handler(this, new EventArgs());
    }

### Event registration

    // The game gets shut down before this completes because of the nature of how events work
    DefaultGame.GameShuttingDown += async (sender, args) =&gt; await this.repo.Save(blah);

I understand that the signature for events are `void EventName` and so making it async is basically fire and forget. My engine makes heavy use of eventing to notify 3rd party developers (and multiple internal components) that events are taking place within the engine and letting them react to them.

Is there a good route to go down to replace eventing with something asynchronous based that I can use? I&#39;m not sure if I should be using `BeginShutdownGame` and `EndShutdownGame` with callbacks, but that&#39;s a pain because then only the calling source can pass a callback, and not any 3rd party stuff that plugs in to the engine, which is what I am getting with events. If the server calls `game.ShutdownGame()`, there&#39;s no way for engine plugins and or other components within the engine to pass along their callbacks, unless I wire up some kind of registration method, keeping a collection of callbacks.

Any advice on what the preferred/recommended route to go down with this would be greatly appreciated! I have looked around and for the most part what I&#39;ve seen is using the Begin/End approach which I don&#39;t think will satisfy what I&#39;m wanting to do.

**Edit**

Another option I&#39;m considering is using a registration method, that takes an awaitable callback. I iterate over all of the callbacks, grab their Task and await with a `WhenAll`.

    private List&lt;Func&lt;Task&gt;&gt; ShutdownCallbacks = new List&lt;Func&lt;Task&gt;&gt;();

    public void RegisterShutdownCallback(Func&lt;Task&gt; callback)
    {
        this.ShutdownCallbacks.Add(callback);
    }

    public async Task Shutdown()
    {
        var callbackTasks = new List&lt;Task&gt;();
        foreach(var callback in this.ShutdownCallbacks)
        {
            callbackTasks.Add(callback());
        }

        await Task.WhenAll(callbackTasks);
    }

How do I await events in C#?

ReSharper suggests me to make type parameter T contravariant by changing this:

    interface IBusinessValidator&lt;T&gt; where T: IEntity
	{
		void Validate(T entity);
	}
    
Into this:

    interface IBusinessValidator&lt;in T&gt; where T: IEntity
	{
		void Validate(T entity);
	}

So what is different between `&lt;T&gt;` and `&lt;in T&gt;`? And what is the purpose of contravariant here?

Let say I have `IEntity`, `Entity`, `User` and `Account` entities. Assuming that both `User` and `Account` have `Name` property that need to be validated.

How can I apply the usage of contravariant in this example?

Why does ReSharper suggest that I make type parameter T contravariant?

Is there a noticable performance difference between using string interpolation:

    myString += $&quot;{x:x2}&quot;;

vs String.Format()?

    myString += String.Format(&quot;{0:x2}&quot;, x);

I am only asking because Resharper is prompting the fix, and I have been fooled before.

String Interpolation vs String.Format

When running unit tests in ReSharper, if the output is too long, it gives this error:

    The output has reached the limit and was truncated.
    To view the full output use &#39;Show Stack Trace in a new window&#39; action.

## Update

ReSharper fixed this issue in 2016.2, see answer from @Alexander Pacha. 


ReSharper Error: &quot;The output has reached the limit and was truncated. To view the full output use &#39;Show Stack Trace in a new window&#39; action.&quot;

I&#39;ve met with a strange problem. I had 7 projects in the solution. I had to add another MVC project. Now when the document (from the new project) is opened  (for example `HomeController.cs`) and when this project is initializing at the start, it freezes the whole IDE like this:

[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/wuZuH.png

(Some projects do not load)

After that, I have to kill the process. When I open VS again and fast click on another project (which is initializing) the freezing issue is gone. I have no idea what can cause a problem like this. I&#39;ve tried with and without ReSharper but I get the same result. Also, I restored default settings of VS. Also repaired whole VS.

Maybe someone had the same problem and could give some helpful advice?

Visual Studio freezing (crashing) while loading solution

I&#39;m getting the following error when running unit tests from visual studio using resharper: 

`Test-case objects missing for the following elements: ...  Rebuild the project and try again`

In the tooltip next to the unit test method it says: `Inconclusive: Test not run` and I think it said `Unit test skipped` at one point.  Resharper shows a grey eye icon.

There&#39;s also a wierd issue with visual studio&#39;s Test Explorer.  It won&#39;t show all my unit tests.  In fact, it&#39;s missing over 200 of my unit tests.  They just don&#39;t appear in the Test Explorer window.  I do have a handful of tests that appear and will run just fine.

Things I&#39;ve tried already: rebooting my machine, clean, rebuild, changing all dependent projects to use the same .net framework 4.7.

I&#39;m using VS 2017 .net Framework 4.7, Resharper, and MSTest.  All with the latest updates and versions.

Content Type	Original Author	Original Content on Stackoverflow
Question	Mathieu Lomax	View Question on Stackoverflow
Solution 1 - C#	John Saunders	View Answer on Stackoverflow
Solution 2 - C#	harishr	View Answer on Stackoverflow

Disable C# 6.0 Support in ReSharper

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Creating a SearchView that looks like the material design guidelines

Homebrew installs nvm but nvm can't be found afterwards?

Attributions