public bool isPackageLoaded(string packagename)//not the zip name but package name like "BlueSky"
{
bool isLoaded = false;
string[] currentlyInstalled = GetCurrentlyLoadedPackages();//get currently loaded R package list
foreach (string s in currentlyInstalled)
{
if (packagename.Equals(s))
{
isLoaded = true;
break;
}
}
return isLoaded;
}