如何使用 C# 执行 powershell 脚本并设置执行策略？

我尝试结合 stackoverflow 中的两个答案（first https://stackoverflow.com/questions/527513/execute-powershell-script-from-c-sharp-with-commandline-arguments & second https://stackoverflow.com/questions/34140309/set-execution-policy-from-process)

InitialSessionState iss = InitialSessionState.CreateDefault();
// Override ExecutionPolicy

PropertyInfo execPolProp = iss.GetType().GetProperty(@"ExecutionPolicy");
if (execPolProp != null && execPolProp.CanWrite)
{
    execPolProp.SetValue(iss, ExecutionPolicy.Bypass, null);
}
Runspace runspace = RunspaceFactory.CreateRunspace(iss);
runspace.Open();

Pipeline pipeline = runspace.CreatePipeline();

//Here's how you add a new script with arguments
Command myCommand = new Command(scriptfile);
CommandParameter testParam = new CommandParameter("key","value");
myCommand.Parameters.Add(testParam);

pipeline.Commands.Add(myCommand);

// Execute PowerShell script
results = pipeline.Invoke(); 

在我的 powershell 脚本中，我有以下参数：

Param(
[String]$key
)

但是，当我执行此操作时，会出现以下异常：

System.Management.Automation.CmdletInvocationException: Cannot validate argument on parameter 'Session'. 
The argument is null or empty. 
Provide an argument that is not null or empty, and then try the command again.

在不知道您的具体问题是什么的情况下，请注意您的 C# 代码可以大大简化，这也可能会解决您的问题：

• 没有必要求助于反射为了设置会话的执行策略。

• 使用一个实例PowerShell https://learn.microsoft.com/en-US/dotnet/api/System.Management.Automation.PowerShell类极大地简化了命令调用。

// Create an initial default session state.
var iss = InitialSessionState.CreateDefault2();
// Set its script-file execution policy (for the current session only).
iss.ExecutionPolicy = Microsoft.PowerShell.ExecutionPolicy.Bypass;

// Create a PowerShell instance with a runspace based on the 
// initial session state.
PowerShell ps = PowerShell.Create(iss);

// Add the command (script-file call) and its parameters, then invoke.
var results =
  ps
   .AddCommand(scriptfile)
   .AddParameter("key", "value")
   .Invoke();

注：.Invoke()方法仅在以下情况下抛出异常终止执行 PowerShell 脚本期间发生错误。比较典型的是非终止的错误是通过报告的.Streams.Error.