Unable to build C# project

Question

I am having some weird problem.
When using this code I am unable to build, however it gives me no build errors.

the code

public void myMethod()
{              
    //This returns a string in JSON format.
    var jsonResponse = myApi.ReadMobileDevice("1");


    dynamic dynamicJson= JsonConvert.DeserializeObject(jsonResponse);

    //THIS LINE BREAKS MY BUILD. NO BUILD ERRORS SHOWN
    var jValue = dynamicJson["general.display_name"];
}

Can anyone tell me why my build braks, and also why no build errors are shown?

UPDATE - Output
*Also changed var to string

1>------ Build started: Project: Control, Configuration: Debug x86 ------
1>  Restoring NuGet packages...
1>  To prevent NuGet from downloading packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages'.
1>  All packages listed in packages.config are already installed.
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(563,28,563,40): error CS0656: Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'
1>C:\ActacomProjects\DEV-Google\Control\Classes\DomainObjects\Schedules\HTTPSchedulesResponse.cs(41,34,41,36): warning CS0168: The variable 'Ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\Classes\DomainObjects\Schedules\HTTPSchedulesResponse.cs(87,30,87,32): warning CS0168: The variable 'Ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(1225,26,1225,45): warning CS0219: The variable 'recreateApplication' is assigned but its value is never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(1809,71,1809,74): warning CS0168: The variable 'dnf' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(1813,54,1813,56): warning CS0168: The variable 'ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(5017,34,5017,36): warning CS0168: The variable 'Ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(5087,42,5087,44): warning CS0168: The variable 'Ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(5154,42,5154,44): warning CS0168: The variable 'Ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(5192,42,5192,44): warning CS0168: The variable 'Ex' is declared but never used
1>C:\ActacomProjects\DEV-Google\Control\ModifyService.svc.cs(5267,42,5267,44): warning CS0168: The variable 'Ex' is declared but never used
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

You explain what does it mean: it cannot build but I have no errors? It VS doesn't show you errors, check output log — Piotr Stapp, Sep 09 '15 at 08:51
There is no Error in The log. It prompts me with "build failed" — Nick Prozee, Sep 09 '15 at 08:55
I wonder if it has something to do with using `var` to refer to an object defined as `dynamic`? `var` needs to be able to imply the type at compile time, but `dynamic` is unknown until runtime. — Michael McMullin, Sep 09 '15 at 08:56
Changed it to string. Still no succesful build. Aso added picture to clarify — Nick Prozee, Sep 09 '15 at 09:01
Where are you looking at "The log"? Added picture shows error window, not "Output Window" - can you look in the output window? — freedomn-m, Sep 09 '15 at 09:02
Change `var` to `dynamic` in the offending line. Once you define a `dynamic` variable, all properties and method output are expected to be `dynamic` . You should also check the `Output` window for the build log, not the `Errors` window — Panagiotis Kanavos, Sep 09 '15 at 09:03
My bad. Updated it, I can see an error at 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create' — Nick Prozee, Sep 09 '15 at 09:06
Now the error is clear and it looks like you forgot to add the `Microsoft.CSharp.dll` to your project. Did you convert it from a previous version? Check [this duplicate question](http://stackoverflow.com/questions/22864790/using-system-dynamic-in-roslyn) for a similar error — Panagiotis Kanavos, Sep 09 '15 at 09:07

score 111 · Accepted Answer · edited Jul 06 '17 at 16:03

111

You have this error in your output:

Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'

You need to add a reference to the DLL Microsoft.CSharp.dll.

edited Jul 06 '17 at 16:03

Sᴀᴍ Onᴇᴌᴀ

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answered Sep 09 '15 at 09:07

amit dayama

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Problem solved for me when I added System.Core in-addition to Microsoft.CSharp – Saminathan S Feb 07 '18 at 08:59
7

I have to add Nuget.CSharp in xamarin.Forms project as projects target .Net core 2.x and CSharp assembly cannot be explicitly added to portable project. worked. – Sakthivel Mar 01 '18 at 10:38
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I use the same why from Sakthivel by adding Microsoft.CSharp from nuget to the .net standard project to fix this issue – frank Mar 06 '18 at 12:30
3

I added the Nuget Package Microsoft.CSharp, but I have the same error. – Renzo Ciot Aug 20 '18 at 13:15

score 16 · Answer 2 · answered Mar 07 '18 at 12:20

16

As similar to Saminathan S's comment in the accepted answer. If you are using .NETStandard projects (in my case NETStandard 2.0) you need to add Microsoft.CSharp from NuGet rather than as a reference in order to resolve this build error. I was using Visual Studio Community on a Mac.

answered Mar 07 '18 at 12:20

The Senator

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Same for me in VS2017 Professional on Windows. Why this wasn't included in the project template remains a mystery. – jmdon May 06 '18 at 13:16
Same for me using VS2019 Community on Windows x64 with NETStandard2.0. – GaidinD Sep 25 '20 at 11:47

score 7 · Answer 3 · answered Apr 21 '19 at 17:42

7

Quick solution.

Right click on Packages > Add NuGet Packages... > Microsoft.CSharp

This worked for me. [Mac, Visual Studio 2017 Community]

answered Apr 21 '19 at 17:42

ScriptKiddieOnAComputer

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score 2 · Answer 4 · answered Feb 20 '19 at 17:27

2

You can also edit your .csproj file adding this, which has the same result as @the-senator said:

<PackageReference Include="Microsoft.CSharp" Version="4.5.0" />

answered Feb 20 '19 at 17:27

Tena

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Unable to build C# project

4 Answers4