最近在做一个使用powershell向SCVMM服务器发送创建虚拟机之类指令的，当出现一条指令执行失败后以后再也无法发送类似的指令。那条指令失败后Runspace关闭后，下次发送指令也还会检测Runspace的状态，如果关闭会重新打开。但SCVMM作业记录都没显示有收到这条指令。

public class PSHelper
    {
        public PowerShell ps = PowerShell.Create();
        public PSCommand psc = new PSCommand();
        public PSObject pss;
        public Runspace runspace ;//RunspaceFactory.CreateRunspace();

        public static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
     
        public PSHelper()
        {
            runspace = RunspaceFactory.CreateRunspace();
            OpenRunspace();
        
        }

        public void  OpenRunspace()
        {
          
            if (runspace.RunspaceStateInfo.State.ToString().Equals("Closed"))
            {
                runspace = RunspaceFactory.CreateRunspace();
              
            }
            if  (runspace.RunspaceStateInfo.State.ToString().Equals("BeforeOpen"))
            {
                runspace.Open();
            }
           
        }

        public void Close()
        {
            runspace.Close();
          //  ps.Dispose();//add by xiongww
            if (runspace.RunspaceStateInfo.State.ToString().Equals("Opened"))
            {
                runspace.Close();
            }
        }

        public PSCredential GetPSCredential(string computername, string username, string password)
        {
            SecureString str = new SecureString();
            foreach (char ch in password)
            {
                str.AppendChar(ch);
            }
            return new PSCredential(username, str);
        }


        public void InitPSSession(string computername, string username, string password)
        {
            SecureString str = new SecureString();
            foreach (char ch in password)
            {
                str.AppendChar(ch);
            }
            PSCredential credential = new PSCredential(username, str);
            Hashtable htParameters = new Hashtable();
            htParameters.Add("computername", computername);
            htParameters.Add("credential", credential);
            Collection<PSObject> collection = this.RunPowerShellLocal("new-pssession", htParameters);
            this.pss = collection[0];
        }

       

        public Collection<PSObject> RunPowerShellRemote(string script)
        {
           
            Collection<PSObject> collection;
           (!runspace.RunspaceStateInfo.State.ToString().Equals("Closed"))
            //{
                this.psc.Clear();
                
                ScriptBlock block = ScriptBlock.Create(script);
                this.psc.AddCommand("invoke-command");
                this.psc.AddParameter("scriptBlock", block);

                this.psc.AddParameter("session", this.pss);
                OpenRunspace();

                this.ps.Commands = this.psc;
                this.ps.Runspace = runspace;
                collection = this.ps.Invoke();
         
            return collection;
            
        }

     
    }
}

上面是执行powershell的核心代码，失败以后再发送指令过去“collection”接受到的值都为空