我遇到一个问题，NuGet包安装的库无法在PowerShell中运行。我已经这样安装了它(也尝试了CurrentUser范围和包的更高版本，但最终没有什么不同(：
Install-Package Microsoft.Bcl.AsyncInterfaces -Version 1.0.0.0
Microsoft.Bcl.AsyncInterfaces是我正在使用的AWS.Tools模块所必需的，但无论我做什么，模块程序集都找不到它。起初，我甚至无法将类型添加到自己的会话中：
Add-Type -AssemblyName Microsoft.Bcl.AsyncInterfaces
添加类型：找不到路径'/home/username/src/work-aws/generate hostname/Microsoft.Bcl.AncInterfaces.dll'，因为它不存在。
但我可以直接从包源目录加载它：
Add-Type -Path "$(( Get-Package Microsoft.Bcl.AsyncInterfaces ).Source | Split-Path -Parent)/lib/netstandard2.1/Microsoft.Bcl.AsyncInterfaces.dll"
然而。。。AWS模块中的程序集仍然看不到它。我从AWS类中得到的错误如下：
System.IO.FileNotFoundException：无法加载文件或程序集"Microsoft.Bcl.AsyncInterfaces，Version=1.0.0.0，Culture=neutral，PublicKeyToken=cc7b13ffcd2ddd51'。系统找不到指定的文件。
这里缺少什么？我不知道如何让这个AWS模块看到程序集，即使在调用Add-Type从其完全限定的路径强制加载程序集之后也是如此。
我已经在这里发布了Exception变量的输出，尽管一切仍然表明找不到Microsoft.Bcl.AsyncInterfaces：
ErrorRecord : Exception calling "LoadTable" with "2" argument(s): "The type initializer for 'Amazon.DynamoDBv2.DynamoDBEntryConversion' threw an exception."
WasThrownFromThrowStatement : False
TargetSite : Void ConvertToMethodInvocationException(System.Exception, System.Type, System.String, Int32, System.Reflection.MemberInfo)
StackTrace : at System.Management.Automation.ExceptionHandlingOps.ConvertToMethodInvocationException(Exception exception, Type typeToThrow, String
methodName, Int32 numArgs, MemberInfo memberInfo)
at CallSite.Target(Closure , CallSite , Type , Object , String )
at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
at System.Management.Automation.Interpreter.DynamicInstruction`4.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
Message : Exception calling "LoadTable" with "2" argument(s): "The type initializer for 'Amazon.DynamoDBv2.DynamoDBEntryConversion' threw an exception."
Data : {System.Management.Automation.Interpreter.InterpretedFrameInfo}
InnerException : System.TypeInitializationException: The type initializer for 'Amazon.DynamoDBv2.DynamoDBEntryConversion' threw an exception.
---> System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The
system cannot find the file specified.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeAssembly.get_DefinedTypes()
at Amazon.DynamoDBv2.DynamoDBEntryConversion.AddConverters(String suffix)
at Amazon.DynamoDBv2.DynamoDBEntryConversion.SetV1Converters()
at Amazon.DynamoDBv2.DynamoDBEntryConversion..ctor(ConversionSchema schema, Boolean isImmutable)
at Amazon.DynamoDBv2.DynamoDBEntryConversion..cctor()
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
--- End of inner exception stack trace ---
at CallSite.Target(Closure , CallSite , Type , Object , String )
HelpLink :
Source : System.Management.Automation
HResult : -2146233087
我发现使用Install-Package安装的程序集需要以这种方式加载的原因：
Add-Type -Path "$(( Get-Package Microsoft.Bcl.AsyncInterfaces ).Source | split-path -Parent)/lib/netstandard2.1/Microsoft.Bcl.AsyncInterfaces.dll"
是因为PackagementManagement提供程序文件夹中的package/lib目录不是.NET默认探测路径的一部分。当您的模块或项目的程序集路径在文件中是可配置的，但在PowerShell会话AFAIK中，您不能修改程序集探测路径时，这就不那么成问题了。因此，必须使用完整路径加载程序集。
至于为什么在我将有问题的AWS程序集加载到会话后找不到程序集名称，我也找到了解决方案。经过一些额外的测试，我发现这里有一个操作顺序；如果在其他程序集尝试使用Add-Type或[Reflection.Assembly]::LoadFile的程序集之后添加该程序集，则第二个程序集在PowerShell会话期间将找不到第一个程序集。在我的案例中，任何以某种方式使用Amazon.DynamoDBv2.DynamoDBEntryConversion的程序集都是失败的，因为它永远找不到Microsoft.Bcl.AsyncInterfaces。
我的问题是，我会加载一个新的会话，并开始运行我的代码，忘记了首先使用Add-Type添加Microsoft.Bcl.AsyncInterfaces程序集，然后使用依赖它的AWS库。一旦方法失败，我添加了程序集，但对该会话来说为时已晚。因此，这里的解决方案是执行以下操作：
# Load the Microsoft.Bcl.AsyncInterfaces assembly
Add-Type -Path "$(( Get-Package Microsoft.Bcl.AsyncInterfaces ).Source | split-path -Parent)/lib/netstandard2.1/Microsoft.Bcl.AsyncInterfaces.dll"
# Read a DynamoDB table from AWS
$regionEndpoint = [RegionEndPoint]::GetBySystemName('us-west-2')
$client = [AmazonDynamoDBClient]::new($regionEndpoint)
[DocumentModel.Table]::LoadTable($client, 'MyDDBTableName') # This is the call that was failing before, succeeds now