无法加载文件或程序集'System.Security.Cryptography.Algorithms，版本= 4.1.0.0 [英] Could not load file or assembly 'System.Security.Cryptography.Algorithms, Version = 4.1.0.0

问题描述

我正在尝试根据我的.NET Standard 1.4库中的System.Security.Cryptography.RNGCryptoServiceProvider类，并根据此主题，我的代码如下：

I'm trying to use System.Security.Cryptography.RNGCryptoServiceProvider class in my .NET Standard 1.4 library and according to this topic my code looks like this:

    private byte[] GenerateRandomNumber(int length)
    {
        using (var randomNumberGenerator = RandomNumberGenerator.Create())
        {
            var number = new byte[length];
            randomNumberGenerator.GetBytes(number);

            return number;
        }
    }

我还从NuGet库安装了

I have also installed from NuGet libraries:

• System.Security.Cryptography.Algorithms v = 4.3.0


• System.Security.Cryptography.Primitives v = 4.3.0

但是尝试发射它会给我：

But trying fire it up gives me:

'Could not load file or package' System.Security.Cryptography.Algorithms, Version = 4.1.0.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a 'or one of its dependencies. The specified file could not be found. '

然后在 NuGet页面没有4.1.0.0版本，只有 4.1.0-rc2-24027 ，安装此版本后，我得到的异常完全相同。

And on NuGet page there is no 4.1.0.0 version, only 4.1.0-rc2-24027 and after installing this version I get exact same exception.

怎么了？

编辑：
从.NET Standard 1.4切换到1.6并没有帮助

Edit: Switching from .NET Standard 1.4 to 1.6 didn't help

Edit2 ：

当我在 RandomNumberGenerator上按下F12时：

#region Assembly System.Security.Cryptography.Algorithms, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
// C:\Users\x.y\.nuget\packages\system.security.cryptography.algorithms\4.3.0\ref\netstandard1.4\System.Security.Cryptography.Algorithms.dll
#endregion

namespace System.Security.Cryptography
{
    public abstract class RandomNumberGenerator : IDisposable
    {
        protected RandomNumberGenerator();

        public static RandomNumberGenerator Create();
        public void Dispose();
        public abstract void GetBytes(byte[] data);
        protected virtual void Dispose(bool disposing);
    }
}

因此它需要4.1.0版本（不存在）在NuGet上），但路径设置为4.3.0

So it wants 4.1.0 version (that not exists on NuGet) but path is set for 4.3.0

推荐答案

除了拥有.NET Standard库之外，您还拥有一个应用程序（例如控制台应用程序）或测试项目。应用程序的平台确定要加载.NET标准库引用的特定程序集。

In addition to having a .NET Standard library you also have an application (like a console application) or perhaps a test project. The platform for the application determines what specific assembly referenced by your .NET Standard library to load.

因此，您的库引用了 System.Security.Cryptography。算法 4.3.0，但是要为您的平台加载的程序集的实际版本可能是4.1.0（即您在.NET Framework 4.6.1上获得的版本）。

So your library references System.Security.Cryptography.Algorithms 4.3.0 however the actual version of the assembly to load for your platform may be 4.1.0 (that is the version you get on .NET Framework 4.6.1).

因此，您需要通知应用程序将所需版本（4.3.0）重定向到运行时的实际版本（4.1.0）。您可以在 app.config 文件中执行此操作。请记住，该文件由应用程序而非库使用。将 app.config 文件添加到您的库不会有任何效果。

So you need to inform your application to redirect the desired version (4.3.0) to the actual version for your runtime (4.1.0). You can do that in the app.config file. Remember that this file is used by the application and not the library. Adding an app.config file to your library will not make a difference.

我试图创建一个小项目就像您描述的那样，除了引用 System.Security.Cryptography.Algorithms 4.3.0的.NET Standard 1.4库外，还有一个NET Framework 4.62控制台应用程序，包括一个 app.config 文件，该文件具有以下内容才能工作：

I tried to create a small project like the one you describe that in addition to a .NET Standard 1.4 library that references System.Security.Cryptography.Algorithms 4.3.0 has a NET Framework 4.62 console application and I had to include an app.config file with the following contents for this to work:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
  </startup>

  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.3.0.0" newVersion="4.1.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Security.Cryptography.Algorithms" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.3.0.0" newVersion="4.1.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

有趣的是，如果您切换到.NET Standard 2.0，这似乎没什么问题。

Anecdotally, this seems to be less of a problem if you switch to .NET Standard 2.0.

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