使用.NET CORE安装NuGet软件包和Visual Studio代码失败

Question

I am on ubuntu and I use VSCode and .NET CORE, I installed a package called Otter with the command panel.

My .csproj is now like this :

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Otter" Version="0.9.8.926"/>
  </ItemGroup>

My main .cs file is :

using System;
using Otter;

namespace helloWorldFromCSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello");
        }
    }
}

But when I try to build my project with :

dotnet build

I receive this error :

Program.cs(2,7): error CS0246: The type or namespace name 'Otter' could not be found (are you missing a using directive or an assembly reference?) [/home/erwan/Documents/helloWorldFromCSharp/helloWorldFromCSharp.csproj]

I don"t know how to fix it.

Answer 1

I tested with a simple .Net Core App to reproduce the problem. I have the same issue.

Otter is in .Net Framework 4.5, so It won't work with an Asp.Net Core Application.

Since you are on Ubuntu, you can't just switch to Asp.Net MVC. I recommend you to look for another 2d framework wrote in .Net Core or in .Net Standard (don't know if it is possible)

Answer 2

Looking at Otter.csproj :

<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>

Meaning, you can't reference it from a project that compiles to netcoreapp2.1

You might want to clone the project and try to target it to a suitable framework version, if possible.