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 ========== 

Answer 1

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.

Answer 2

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.