C# Runspace Powershell (Interactive)

问题:

I am trying with C# to execute a Powershell file with paramters in a runspace. Unfortunately i get the following output:

A command that prompts the user failed because the host program or the command type does not support user interaction. Try a host program that supports user interaction, such as the Windows PowerShell Console or Windows PowerShell ISE, and remove prompt-related commands from command types that do not support user interaction, such as Windows PowerShell workflows. 

What could i do?

Current c# code. this needs to execute commands that will be in a PS file and needs to return a json string.

public string ExecuteCommandDirect(int psId, string psMaster, string psFile) {     String FullPsFilePath = @"C:\CloudPS\" + psFile + ".ps1";      String PsParameters = FullPsFilePath + " -psId " + psId + " -psMaster " + psMaster + " -NonInteractive";      // Create Powershell Runspace     Runspace runspace = RunspaceFactory.CreateRunspace();      runspace.Open();      // Create pipeline and add commands     Pipeline pipeline = runspace.CreatePipeline();     pipeline.Commands.AddScript(PsParameters);      // Execute Script     Collection<PSObject> results = new Collection<PSObject>();     try     {         results = pipeline.Invoke();     }     catch (Exception ex)     {         results.Add(new PSObject((object)ex.Message));     }      // Close runspace     runspace.Close();      //Script results to string     StringBuilder stringBuilder = new StringBuilder();     foreach (PSObject obj in results)     {         Debug.WriteLine(obj);         stringBuilder.AppendLine(obj.ToString());     }      return stringBuilder.ToString();  } 

PS Code:

param([int]$psId = 0, [string]$psMaster = 'localhost');  $date = Get-Date -Format 'h:m:s' | ConvertTo-Json;  Write-Host $date;  exit; 

回答1:

If you need to run a script that uses non-critical cmdlets like write-host that require the presence of a fully-fledged pshost, you can add "fake" functions to the runspace that either do nothing or log to a text file (or anything else you want.) See my other answer here:

How can I execute scripts in a code created powershell shell that has Write-Host commands in it?

回答2:

Use Write-Output instead of Write-Host

回答3:

I have solved this problem myself for Read-Host and Write-Host, by overriding those two cmdlets. In my solution, I silently drop anything sent to Write-Host, but I need to implement Read-Host. This starts a new powershell process and gets the results back.

        string readHostOverride = @"             function Read-Host {                 param(                     [string]$Prompt                 )                    $StartInfo = New-Object System.Diagnostics.ProcessStartInfo                 #$StartInfo.CreateNoWindow = $true                  $StartInfo.UseShellExecute = $false                  $StartInfo.RedirectStandardOutput = $true                  $StartInfo.RedirectStandardError = $true                  $StartInfo.FileName = 'powershell.exe'                  $StartInfo.Arguments = @(""-Command"", ""Read-Host"", ""-Prompt"", ""'$Prompt'"")                 $Process = New-Object System.Diagnostics.Process                 $Process.StartInfo = $StartInfo                 [void]$Process.Start()                 $Output = $Process.StandardOutput.ReadToEnd()                  $Process.WaitForExit()                  return $Output.TrimEnd()             }         ";          string writeHostOverride = @"             function Write-Host {             }         ";          Run(readHostOverride);         Run(writeHostOverride); 

Run() is, unsurprisingly, my method for executing powershell.

You could easily extend this to implement Write-Host too; let me know if you have any difficulty.

To commenters suggesting switching to Write-Output instead of Write-Host, this is NOT a solution for many use cases. You may not want your user notifications going into your output stream, for example.

Should you need to use the original cmdlets, use this:

Microsoft.PowerShell.Utility\Read-Host -Prompt "Enter your input" 

文章来源: C# Runspace Powershell (Interactive)