从包含变量的C#执行多个Powershell命令

我有一个powershell脚本，我想从C#运行它。脚本的内容是：

$w = Get-SPWebApplication "http://mysite/"
$w.UseClaimsAuthentication = 1
$w.Update()
$w.ProvisionGlobally()
$w.MigrateUsers($True) 

并且用于将站点设置为基于声明的身份验证。我知道如何从C#执行多个命令，但不确定如何在考虑变量$w的情况下运行整个脚本。

PowerShell OPowerShell = null;
Runspace OSPRunSpace = null;
RunspaceConfiguration OSPRSConfiguration = RunspaceConfiguration.Create();
PSSnapInException OExSnapIn = null;
//Add a snap in for SharePoint. This will include all the power shell commands for SharePoint
PSSnapInInfo OSnapInInfo = OSPRSConfiguration.AddPSSnapIn("Microsoft.SharePoint.PowerShell", out OExSnapIn);
OSPRunSpace = RunspaceFactory.CreateRunspace(OSPRSConfiguration);
OPowerShell = PowerShell.Create();
OPowerShell.Runspace = OSPRunSpace;
Command Cmd1 = new Command("Get-SPWebApplication");
Cmd1.Parameters.Add("http://mysite/");
OPowerShell.Commands.AddCommand(Cmd1);
// Another command
// Another command
OSPRunSpace.Open();
OPowerShell.Invoke();
OSPRunSpace.Close();

我该如何执行所有命令，将它们作为单独的命令添加，或者将脚本保存到文件中并读取以供执行？最佳实践是什么？

OPowerShell.Commands.AddScript("@
 $w = Get-SPWebApplication ""http://mysite/""
 $w.UseClaimsAuthentication = 1
 $w.Update()
 $w.ProvisionGlobally()
 $w.MigrateUsers($True)
");

OPowerShell.Commands.AddScript("@
 $w = Get-SPWebApplication $args[0]
 ...
");
OPowerShell.Commands.AddParameter(null, "http://mysite/");