Dynamic reference in a .net core app targeting net standard 1.6?

Question

I'm trying to use a dynamic variable in a C# .net core app that's targeting .net standard 1.6. (platform? library? framework? meta-framework?) I first encountered this problem in a real application, but I have reduced it to a minimal reproduction.

project.json

{
    "version": "1.0.0-*",
    "buildOptions": { "emitEntryPoint": true },
    "dependencies": { "NETStandard.Library": "1.6.0" },
    "frameworks": {
        "netstandard1.6": { "imports": "dnxcore50" }
    },
    "runtimes": { "win10-x64": {} }
}

Program.cs

using System;

public class Program {
    public static void Main(string[] args) {
        dynamic hello = "hello world";
        Console.WriteLine(hello);
    }
}

When I try to build this, I'm getting a build error on Console.WriteLine(hello); saying this.

CS0656 Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'

Is it possible to use dynamic variables in an application targeting netstandard 1.6? How?

If it helps, targeting netcoreapp1.0 (that's also supporting netstandard 1.6) fixes the error. That's weird. — krontogiannis
– krontogiannis, Commented Sep 2, 2016 at 21:37

Set · Accepted Answer · 2016-09-02 21:43:43Z

65

Add System.Dynamic.Runtime and Microsoft.CSharp as dependencies.

answered Sep 2, 2016 at 21:43

Set

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3 Comments

recursive Over a year ago

I ended up having to add the following dependencies and versions: "System.Dynamic.Runtime": "4.0.11", "Microsoft.CSharp": "4.0.1", "Microsoft.NETCore.Runtime.CoreCLR": "1.0.4". It's able to build and run now.

svick Over a year ago

Microsoft.CSharp depends on System.Dynamic.Runtime, so you don't need to add both.

Brent Rittenhouse Over a year ago

@recursive: I concur. I had to add all three of these as well. Maybe it has something to do with the fact that it's a .NET Standard project?

Hong · Accepted Answer · 2017-08-29 17:45:43Z

32

Right-click the project > Manage NuGet Packages... > Add the following two highlighted packages:

answered Aug 29, 2017 at 17:45

Hong

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1 Comment

ebol2000 Over a year ago

This fixed my issue. I am running .net core 2.1 (or 2.2... same issue). I only needed to add Microsoft.CSharp.

svick · Accepted Answer · 2016-09-03 09:43:33Z

7

If you're writing an application, not a library, you should use Microsoft.NETCore.App, not NETStandard.Library and netcoreapp1.0, not netstandard1.6. Doing that would fix your issue.

If you want to use dynamic in a library (or application that does not depend on Microsoft.NETCore.App), you need to add Microsoft.CSharp as a dependency.

edited Sep 3, 2016 at 9:43

answered Sep 3, 2016 at 9:38

svick

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2 Comments

recursive Over a year ago

Is there an authoritative reference for which "frameworks" should be used for which purposes? I've been looking for information on what all this means, and all I find are contradictory blogs and similar. What's your source for this information?

svick Over a year ago

For a start, that's what the project.json produced by dotnet new -t console and dotnet new -t lib produce. For more explanation, see the article Packages, Metapackages and Frameworks in .Net docs, specifically the section on Package-based Frameworks.

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