執行在C＃中的powershell

我想在C＃中執行一個PowerShell腳本，但我得到一個ParameterBindingException，我幾乎堆棧。執行在C＃中的powershell

private string path = @"d:\\foo.ps1"; 

private string RunScript(string scriptText) 
{ 
    Runspace runspace = RunspaceFactory.CreateRunspace(); 

    runspace.Open(); 

    Pipeline pipeline = runspace.CreatePipeline(); 
    pipeline.Commands.AddScript(scriptText); 

    pipeline.Commands.Add("Out-String"); 

    Collection<PSObject> results = pipeline.Invoke(); 

    runspace.Close(); 

    StringBuilder stringBuilder = new StringBuilder(); 
    foreach (PSObject obj in results) 
    { 
     stringBuilder.AppendLine(obj.ToString()); 
    } 

    return stringBuilder.ToString(); 
} 

private string LoadScript(string filename) 
{ 
    try 
    { 
     using (StreamReader sr = new StreamReader(filename)) 
     { 
      StringBuilder fileContents = new StringBuilder(); 

      string curLine; 

      while ((curLine = sr.ReadLine()) != null) 
      { 
       fileContents.Append(curLine + "\n"); 
      } 

      return fileContents.ToString(); 
     } 
    } 
    catch (Exception e) 
    { 
     string errorText = "The file could not be read:"; 
     errorText += e.Message + "\n"; 
     return errorText; 
    } 
} 

private void button1_Click(object sender, EventArgs e) 
{ 
    RunScript(LoadScript(path)); 
} 
}