**Update**: `project.json` has been replaced with `.csproj` as the main project file for .NET Standard projects. This question refers to the old system before the introduction of [PackageReference in NuGet 4.0](https://docs.microsoft.com/en-us/nuget/consume-packages/package-references-in-project-files).

You may still occasionally see `project.lock.json` as an artifact of the build process, but it should be ignored. Managing the NuGet packages that your .NET Standard/.NET Core project depends on should always be done by either

* Editing the `.csproj` file directly
* Using the [dotnet CLI](https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-add-package) (`dotnet add package`, etc)
* Using the Package Manager GUI if you&#39;re using Visual Studio

---

**Old answer** for posterity: `project.lock.json` is generated by the .NET tooling when you restore the project&#39;s packages. You shouldn&#39;t touch it or check it into source control. Edit `project.json` directly.

During the package restore process (`dotnet restore`), NuGet has to analyze the dependencies in your project, walk *their* dependency graphs, and figure out what packages should be installed for your project and your project&#39;s dependencies.

This is a non-trivial amount of work, so the results are cached in `project.lock.json` to make subsequent restores faster and more efficient. The lock file will be regenerated if `project.json` is modified and `dotnet restore` is executed again.

Every so often, in our team, when someone updates some nuget, we have the same problem, the lock.json files doens&#39;t get updated, even running **dotnet restore**  so, before applying the last choice (deleting them) I suggest run **grunt** from your command line.
If that doesn&#39;t work, delete all the lock.json files and run **dotnet restore**, this is my favourite choice ;)

When I read [BlueZ][1] source code, I often see `char` arrays defined like this:

    // bluez/android/sco-msg.h
    static const char BLUEZ_SCO_SK_PATH[] = &quot;\0bluez_sco_socket&quot;;

What good is it to define the first element as `\0`?

  [1]: https://en.wikipedia.org/wiki/Bluetooth_stack#BlueZ


Why define \0 as the first element of a char array in C?

I want to install and run Typescript (i.e. no global dependencies).

Here is my package.json file:

    {
      &quot;name&quot;: &quot;foo&quot;,
      &quot;version&quot;: &quot;1.0.0&quot;,
      &quot;description&quot;: &quot;&quot;,
      &quot;main&quot;: &quot;index.js&quot;,
      &quot;scripts&quot;: {
        &quot;test&quot;: &quot;echo \&quot;Error: no test specified\&quot; &amp;&amp; exit 1&quot;,
        &quot;tsc&quot;: &quot;tsc&quot;
      },
      &quot;devDependencies&quot;: {
        &quot;typescript&quot;: &quot;^1.8.10&quot;
      },
      &quot;author&quot;: &quot;&quot;,
      &quot;license&quot;: &quot;ISC&quot;
    }

I then run:

    npm install
    npm run tsc

However when I run the second command I get sooo many errors it cannot display all it. Most of it is like the following:

    ../foo/node_modules/typescript/lib/lib.d.ts(5015,5): error TS2300: Duplicate identifier &#39;webkitTransformOrigin&#39;.
    ../foo/node_modules/typescript/lib/lib.d.ts(5016,5): error TS2300: Duplicate identifier &#39;webkitTransformStyle&#39;.
    ../foo/node_modules/typescript/lib/lib.d.ts(5017,5): error TS2300: Duplicate identifier &#39;webkitTransition&#39;.
    ../foo/node_modules/typescript/lib/lib.d.ts(5018,5): error TS2300: Duplicate identifier &#39;webkitTransitionDelay&#39;.
    ../foo/node_modules/typescript/lib/lib.d.ts(5019,5): error TS2300: Duplicate identifier &#39;webkitTransitionDuration&#39;.
    ../foo/node_modules/typescript/lib/lib.d.ts(5020,5): error TS2300: Duplicate identifier &#39;webkitTransitionProperty&#39;.

In npm-debug.log I get:

    0 info it worked if it ends with ok
    1 verbose cli [ &#39;/usr/bin/nodejs&#39;, &#39;/usr/bin/npm&#39;, &#39;run&#39;, &#39;tsc&#39; ]
    2 info using npm@3.10.2
    3 info using node@v5.12.0
    4 verbose run-script [ &#39;pretsc&#39;, &#39;tsc&#39;, &#39;posttsc&#39; ]
    5 info lifecycle foo@1.0.0~pretsc: foo@1.0.0
    6 silly lifecycle foo@1.0.0~pretsc: no script for pretsc, continuing
    7 info lifecycle foo@1.0.0~tsc: foo@1.0.0
    8 verbose lifecycle foo@1.0.0~tsc: unsafe-perm in lifecycle true
    9 verbose lifecycle foo@1.0.0~tsc: PATH: /usr/lib/node_modules/npm/bin/node-gyp-bin:/home/vagrant/foo/node_modules/.bin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
    10 verbose lifecycle foo@1.0.0~tsc: CWD: /home/vagrant/foo
    11 silly lifecycle foo@1.0.0~tsc: Args: [ &#39;-c&#39;, &#39;tsc&#39; ]
    12 silly lifecycle foo@1.0.0~tsc: Returned: code: 2  signal: null
    13 info lifecycle foo@1.0.0~tsc: Failed to exec tsc script
    14 verbose stack Error: foo@1.0.0 tsc: `tsc`
    14 verbose stack Exit status 2
    14 verbose stack     at EventEmitter.&lt;anonymous&gt; (/usr/lib/node_modules/npm/lib/utils/lifecycle.js:242:16)
    14 verbose stack     at emitTwo (events.js:100:13)
    14 verbose stack     at EventEmitter.emit (events.js:185:7)
    14 verbose stack     at ChildProcess.&lt;anonymous&gt; (/usr/lib/node_modules/npm/lib/utils/spawn.js:40:14)
    14 verbose stack     at emitTwo (events.js:100:13)
    14 verbose stack     at ChildProcess.emit (events.js:185:7)
    14 verbose stack     at maybeClose (internal/child_process.js:850:16)
    14 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:215:5)
    15 verbose pkgid foo@1.0.0
    16 verbose cwd /home/vagrant/foo
    17 error Linux 3.13.0-88-generic
    18 error argv &quot;/usr/bin/nodejs&quot; &quot;/usr/bin/npm&quot; &quot;run&quot; &quot;tsc&quot;
    19 error node v5.12.0
    20 error npm  v3.10.2
    21 error code ELIFECYCLE
    22 error foo@1.0.0 tsc: `tsc`
    22 error Exit status 2
    23 error Failed at the foo@1.0.0 tsc script &#39;tsc&#39;.
    23 error Make sure you have the latest version of node.js and npm installed.
    23 error If you do, this is most likely a problem with the foo package,
    23 error not with npm itself.
    23 error Tell the author that this fails on your system:
    23 error     tsc
    23 error You can get information on how to open an issue for this project with:
    23 error     npm bugs foo
    23 error Or if that isn&#39;t available, you can get their info via:
    23 error     npm owner ls foo
    23 error There is likely additional logging output above.
    24 verbose exit [ 1, true ]


Note that removing the package and then installing typescript globally solves the problem. However if I then use npm install to install the local packages again, it reintroduces the problem.


How to install and run Typescript locally in npm?

I followed the [instruction][1] to create new .NET Core project and ran this from cmd:

    dotnet new
    dotnet restore

The second statement creates `project.lock.json` that contains a lot of garbage (not really garbage but tons of dependencies, configurations etc.). I assume these dependencies is .NET framework that is broken down into separate NuGet packages. 

My questions:

 1. Is my assumption correct?
 2. Can I make my application lighter by removing not needed NuGet packages/dependencies?
 3. How?

  [1]: https://www.microsoft.com/net/core#windows

What is project.lock.json?

I followed the <a href="https://www.microsoft.com/net/core#windows" target="_blank" rel="noopener noreferrer">instruction</a> to create new .NET Core project and ran this from cmd:
<pre><code class="hljs language-arduino">dotnet new
dotnet restore
</code></pre>
The second statement creates <code>project.lock.json</code> that contains a lot of garbage (not really garbage but tons of dependencies, configurations etc.). I assume these dependencies is .NET framework that is broken down into separate NuGet packages.
My questions:
<ol>
<li>Is my assumption correct?</li>
<li>Can I make my application lighter by removing not needed NuGet packages/dependencies?</li>
<li>How?</li>
</ol>

I have a simple .NET Core project (console app) that I&#39;m trying to compile and run. `dotnet build` succeeds, but I get the following error when I do `dotnet run`:

```none
dotnet run
Project RazorPrecompiler (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.
A fatal error was encountered. The library &#39;hostpolicy.dll&#39; required to execute the application was not found in [path].
```

My project.json looks like this:

    {
      &quot;buildOptions&quot;: {
        &quot;warningsAsErrors&quot;: true
      },
      &quot;dependencies&quot;: {
        &quot;Microsoft.AspNetCore.Razor&quot;: &quot;1.0.0&quot;,
        &quot;Microsoft.NETCore.App&quot;: {
          &quot;type&quot;: &quot;platform&quot;,
          &quot;version&quot;: &quot;1.0.0&quot;
        }
      },
      &quot;description&quot;: &quot;Precompiles Razor views.&quot;,
      &quot;frameworks&quot;: {
        &quot;netcoreapp1.0&quot;: {
          &quot;imports&quot;: [ ]
        }
      },
      &quot;version&quot;: &quot;1.2.0&quot;
    }

What is `hostpolicy.dll`, and why is it missing?

The library hostpolicy.dll was not found

I understand that ASP.NET Core is a modular framework which unites technologies like ASP.NET MVC and Web API into a single programming model.

But one of the features of ASP.NET MVC 6 was introducing the merging of MVC 6 and Web API together along with following features.
Dependency injection is inbuilt and part of MVC.

1) Side by side - deploy the runtime and framework with your application

2) Everything packaged with NuGet, Including the .NET runtime itself.

3) New JSON based project structure.

4) No need to recompile for every change. Just hit save and refresh the browser.

5) Compilation done with the new Roslyn real-time compiler.

So why there are 2 standalone ASP.NET frameworks? since core framework has been in existence, will MVC 6 not be used hereafter? 

would be great if someone can clarify.

What is the difference between ASP.NET MVC 6 and ASP.NET Core 1.0 and the reason behind the core framework?

At some point in time the CoreCLR supported async main entry points. See http://blog.stephencleary.com/2015/03/async-console-apps-on-net-coreclr.html

However both the following programs are not working in .NET Core RTM

    using System;
    using System.Threading.Tasks;
    
    namespace ConsoleApplication
    {
        public class Program
        {
            public static async Task Main(string[] args)
            {
                await Task.Delay(1000);
                Console.WriteLine(&quot;Hello World!&quot;);
            }
        }
    }

or

    using System;
    using System.Threading.Tasks;
    
    namespace ConsoleApplication
    {
        public class Program
        {
            public async Task Main(string[] args)
            {
                await Task.Delay(1000);
                Console.WriteLine(&quot;Hello World!&quot;);
            }
        }
    }

These both fail with the error:

&gt; error CS5001: Program does not contain a static &#39;Main&#39; method suitable for an entry point

Are async console applications supported in .NET Core RTM?

Are async console applications supported in .NET Core?

I&#39;d really like to start using .NET Core and slowly migrate applications and libraries to it.  However, I can&#39;t realistically upgrade my entire code base to use .NET Core and then go through the process of testing and deploying a plethora of applications in production.

As an example, if I create a new .NET Core application and try to reference one of my .NET Framework projects I get the following:

&gt; The following projects are not supported as references: -
&gt; Foobar.NetFramework has target frameworks that are incompatible with
&gt; targets in current project Foobar.NetCore.
&gt; 
&gt; Foobar.NetCore: .NETCoreApp,Version=v1.0
&gt;
&gt; Foobar.NetFramework: .NETFramework,Version=v4.5

Is it possible to create a new .NET Core application and reference my existing .NET Framework libraries?  If so, what&#39;s the process for doing that?  I&#39;ve spent hours going through Microsoft&#39;s documentation and searching their issues on GitHub, but I can&#39;t find anything official on how to achieve this or what their long-term vision is for this process.

How do I reference a .NET Framework project in a .NET Core project?

I would like to use Razor as a templating engine in a .NET console application that I&#39;m writing in .NET Core.

The standalone Razor engines I&#39;ve come across (RazorEngine, RazorTemplates) all require full .NET. I&#39;m looking for a solution that works with .NET Core. 

Using Razor outside of MVC in .NET Core

ASP.NET Core support a new configuration system as seen here:
https://docs.asp.net/en/latest/fundamentals/configuration.html

Is this model also supported in .NET Core console applications?

If not what is alternate to the previous `app.config` and `ConfigurationManager` model?

ASP.NET Core configuration for .NET Core console application

Each time I try to install the **DotNetCore.1.0.0-VS2015Tools.Preview2.exe** package I get an error saying the following:

&gt; Setup Failed One or more issues caused the setup to fail.  Please fix
&gt; the issues and then retry setup.  For more information see the log
&gt; file. Setup has detected that Visual Studio 2015 Update 3 may not be
&gt; completely installed.  Please repair Visual Studio 2015 Update 3, then
&gt; install this product again.

When I look into the log file, I find the following line which seems to be causing the error during install:

&gt; Condition &#39;WixBundleInstalled OR NOT(((VS2015CommunityUpdateVersion &lt;&gt;
&gt; VS2015UpdateVersion) AND (VS2015CommunityExists) AND
&gt; (VS2015UpdateVersionExists)) OR ((VS2015ProfessionalUpdateVersion &lt;&gt;
&gt; VS2015UpdateVersion) AND (VS2015ProfessionalExists) AND
&gt; (VS2015UpdateVersionExists)) OR ((VS2015EnterpriseUpdateVersion &lt;&gt;
&gt; VS2015UpdateVersion) AND (VS2015EnterpriseExists) AND
&gt; (VS2015UpdateVersionExists)) OR ((VS2015WebExpressUpdateVersion &lt;&gt;
&gt; VS2015UpdateVersion) AND (VS2015WebExpressExists) AND
&gt; (VS2015UpdateVersionExists))) OR (SKIP_VSU_CHECK=1) OR
&gt; (WixBundleAction=2)&#39; evaluates to false.

A simple repair of Update 3 has not resolved the issue, so I was attempting to resort to an uninstall/reinstall of the update.  When going through 

&gt; Control Panel &gt; Programs and Features &gt; View Installed updates

 to uninstall the update, it jumps right to the &quot;`Setup Completed`&quot; screen saying that all of the components have been uninstalled without any progress screen.  Then when I attempt to run the Update 3 installer it says the Update is already installed.

I then tried using Revo Uninstaller but the same thing happens after cleaning out folders and registry items.

I even tried doing an `/uninstall /force` on the package but to no avail.  It seems something is remaining stuck somewhere that keeps the update registered.  

Any suggestions?

Problems installing Dot Net Core 1.0.0 VS 2015 Tools Preview 2

I want to implement [dependency injection][1] (DI) in ASP.NET Core. So after adding this code to **`ConfigureServices`** method, both ways work.

What is the difference between the `services.AddTransient` and `service.AddScoped` methods in ASP.NET Core?

    public void ConfigureServices(IServiceCollection services)
    {
        // Add framework services.

        // Add application services.
        services.AddTransient&lt;IEmailSender, AuthMessageSender&gt;();
        services.AddScoped&lt;IEmailSender, AuthMessageSender&gt;();
    }

  [1]: https://en.wikipedia.org/wiki/Dependency_injection



Content Type	Original Author	Original Content on Stackoverflow
Question	Andrei	View Question on Stackoverflow
Solution 1 - .Net	Nate Barbettini	View Answer on Stackoverflow
Solution 2 - .Net	Francisco	View Answer on Stackoverflow

What is project.lock.json?

.Net Problem Overview

.Net Solutions

Solution 1 - .Net

Solution 2 - .Net

How to install and run Typescript locally in npm?

Why define \0 as the first element of a char array in C?

Attributions