using (Runspace runspace = RunspaceFactory.CreateRunspace())

            {

                try

                {

                    runspace.Open();

                    Pipeline pipeline = runspace.CreatePipeline();

                    //必须要用AddScript。

                    pipeline.Commands.AddScript("Add-PSSnapin Microsoft.SharePoint.PowerShell");

                    pipeline.Commands.AddScript("$webApplications = Get-SPWebApplication");

                    pipeline.Commands.AddScript("$webApplicationUrls = $webApplications.url");

                    pipeline.Commands.AddScript("Get-SPWebApplication");

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

                    foreach (PSObject result in results)

                    {

                        MessageBox.Show(result.ToString());

                    }

                }

                catch (Exception ex)

                {

                    MessageBox.Show(ex.ToString());

                }

            }