该字符串缺少终结符：＆＃34;。在c＃中使用powershell脚本时

Question

我在c＃代码中使用以下powershell脚本：

Runspace runSpace = RunspaceFactory.CreateRunspace();
                Pipeline pipeline = runSpace.CreatePipeline();
                runSpace.Open();
                string script = @"
                            $Session = New-Object -ComObject 'Microsoft.Update.Session'
                            $Searcher = $Session.CreateUpdateSearcher()
                            $historyCount = $Searcher.GetTotalHistoryCount()
                           $UpdateHistory = $Searcher.QueryHistory(0, $historyCount)
                           $KBs = @()
                    foreach ($Update in $UpdateHistory) { 
                        [regex]::match($Update.Title,'(KB[0-9]{6,7})').value | Where-Object {$_ -ne ""} | foreach { 
                    $KB = New-Object -TypeName PSObject 
                    $KB | Add-Member -MemberType NoteProperty -Name KB -Value $_ 
                    $KB | Add-Member -MemberType NoteProperty -Name Title -Value $Update.Title  
                    $KB | Add-Member -MemberType NoteProperty -Name Description -Value $Update.Description
                    $KB | Add-Member -MemberType NoteProperty -Name Date -Value $Update.Date    
                    $KBs += $KB
                } 
            } 
               $KBs | Select Title,KB,Date";


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

该脚本在PowerShell中运行良好。但是在c＃代码中使用它时，它会返回提到的错误。我已经浏览了谷歌提供的各种相关帖子，但直到现在都没有运气。