Getting error in running dynamically compiled C# code

Question

I compiled a c# code dynamically in a .Net Core 3.1 project. I saved the result as a .dll file and trying to use it in another project. In destination project when I add it as a reference and trying to use, I get this error

the type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Private.CoreLib, Version=4.0.0.0.

I tried to compile the code as netstandard 2.1. And also there is reference to System.Private.CoreLib during the compilation in _references but the version is newer than 4.0.0.0.

_references = new List<MetadataReference>();
_references.Add(MetadataReference.CreateFromFile(typeof(object).Assembly.Location));
_references.Add(MetadataReference.CreateFromFile(Assembly.Load("netstandard, Version=2.1").Location));
 _references.Add(MetadataReference.CreateFromFile(typeof(Newtonsoft.Json.JsonConvert).GetTypeInfo().Assembly.Location));

How can I solve this issue?

Jeremy Lakeman · Accepted Answer · 2020-01-24 00:20:58Z

1

You need a reference to the netstandard library, which doesn't technically define any types, to match your typeof(object).

    var netstandard = AppDomain.CurrentDomain.GetAssemblies().Where(a => a.GetName().Name == "netstandard").Single()

answered Jan 24, 2020 at 0:20

Jeremy Lakeman

11.6k30 silver badges34 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Mohammad Taherian Over a year ago

Thank you. But I have it in my references _references.Add(MetadataReference.CreateFromFile(Assembly.Load("netstandard, Version=2.1").Location));

Jeremy Lakeman Over a year ago

You said 3.1 in the question, so your typeof(object).Assembly would be incompatible.

Mohammad Taherian Over a year ago

I said .Net Core 3.1 and the related .Net Standard is 2.1

Jeremy Lakeman Over a year ago

Still, since you are implicitly referring to the typeof(object).Assembly that is loaded in your process. It makes sense that you should also refer to the compatible netstandard Assembly that you are also currently using. Avoiding any magic numbers that may be incorrect.

Mohammad Taherian Over a year ago

You are right. I tried that without version number and still get same error.

Collectives™ on Stack Overflow

Getting error in running dynamically compiled C# code

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related