“无法加载文件或程序集” net462应用程序引用netstandard1.5库时出错。但为什么？

问题描述

我试图弄清楚在这个示例项目中我可能做错了什么。当我的 net462 应用程序引用 netstandard1.5 库时，出现错误。该应用程序依赖于 System.Collections.Immutable： 1.3.0 ，根据Nuget的目标是NetStandard 1.0。该库取决于 NETStandard.Library： 1.6.0 。

I am trying to figure out what I could be doing wrong in this sample project. I am getting an error when my net462 application references a netstandard1.5 library. The application has a dependency on "System.Collections.Immutable": "1.3.0", which targets NetStandard 1.0 according to Nuget. The library depends on "NETStandard.Library": "1.6.0".

我是否将这两个项目设置错了？我非常感谢对此有任何见识...

Am I setting up either of these projects wrong? I would greatly appreciate any insight on this...

这是他们的project.json：

Here are their project.json :

app：

{
  "buildOptions": {
    "emitEntryPoint": true
  },
  "dependencies": {
    "SomeLibrary": "1.0.0-*"
  },
  "frameworks": {
    "net462": {
      "dependencies": {
        "System.Collections.Immutable": "1.3.0" 
      }
    }
  },
  "version": "1.0.0-*"
}

Library

{
  "buildOptions": {
    "allowUnsafe": true
  },
  "dependencies": {
  },
  "frameworks": {
    "netstandard1.5": {
      "dependencies": {
        "NETStandard.Library": "1.6.0"
      }
    }
  },
  "version": "1.0.0-*"
}

所有库都具有以下接口：

All the library has is this interface:

using System.Collections.Generic;

namespace SomeLibrary
{
    public interface SomeInterface
    {
        int GetValue(KeyValuePair<string, int> somePair);
    }
}

该应用程序实现了此接口并进行了具体的调用类：

The app implements this interface and makes a call the concrete class:

public class Program
{
    public static void Main(string[] args)
    {
        var concreteObject = new ConcreteImplementation();
        var answer = concreteObject.GetValue(new KeyValuePair<string, int>("key", 33));
        Console.WriteLine(answer);
    }
}


class ConcreteImplementation : SomeInterface
{
    public int GetValue(KeyValuePair<string, int> somePair)
    {
        return somePair.Value;
    }
}

如果我尝试运行该应用程序，我得到的错误：

If I try to run the app, here is the error that I get:

{无法加载文件或程序集'System.Runtime，版本= 4.1.0.0，区域性=中性，PublicKeyToken = b03f5f7f11d50a3a'或其依赖项之一。系统找不到指定的文件。： System.Runtime，版本= 4.1.0.0，Culture = neutral，PublicKeyToken = b03f5f7f11d50a3a}

堆栈：在ErrorExample.Consumer..ctor（）
在ErrorExample.Program.Main（String [] args）在..\ErrorExample中\src\ErrorExample\Program.cs：line 11

我在这里缺少什么？
谢谢！

What am I missing here?Thanks!

推荐答案

我不太确定为什么会发生这种情况，但是使用 netstandard1.4 作为库项目的TFM将解决您的问题。换句话说，库的 project.json 应该看起来像这样：

I'm not quite sure about why this is happening, but using netstandard1.4 as a TFM for your library project would resolve your issue. In other words, project.json of your library should look like that:

{
  "buildOptions": {
    "allowUnsafe": true
  },
  "dependencies": {
  },
  "frameworks": {
    "netstandard1.4": { // <-- replace "netstandard1.5" with "netstandard1.4" or lower
      "dependencies": {
        "NETStandard.Library": "1.6.0"
      }
    }
  },
  "version": "1.0.0-*"
}

根据目前的一般经验，避免使用 netstandard1.5 和 netstandard1.6 ：使用 netstandard1.4 并根据需要降低，直到您明确被迫。等待发布 netstandard2.0 。您可以在。这是一个。

And as a current general rule of thumb: avoid using netstandard1.5 and netstandard1.6: use netstandard1.4 and lower according to your requirements until you are explicitly forced to. Wait for release of netstandard2.0. You may read the details about it in the MSDN blog artible about .NET Standard. And here's a FAQ.

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