in C#, i'm trying to get some properties from the instances of Win32_Product, but i seem to have an error saying "Object reference not set to an instance of an object."
here's the code:
class Package {
public string productName;
public string installDate;
public string installLocation;
}
class InstalledPackages
{
public static List<Package> get()
{
List<Package> packages =
new List<Package>();
string query = "SELECT * FROM Win32_Product";
ManagementScope oMs =
new ManagementScope();
ObjectQuery oQuery =
new ObjectQuery(query);
ManagementObjectSearcher oSearcher =
new ManagementObjectSearcher(oMs, oQuery);
ManagementObjectCollection installedPackages = oSearcher.Get();
foreach (ManagementObject package in installedPackages)
{
Package p =
new Package();
p.productName = package["Name"].ToString();
p.installLocation = package["InstallLocation"].ToString();
p.installDate = package["InstallDate"].ToString();
packages.Add(p);
}
return packages;
}
}
the exception appears when it gets to
p.installLocation = package["InstallLocation"].ToString();
also, i get one if i try to do
p.installLocation = package["InstallDate2"].ToString();
if i'm asking for InstallDate it works.
(i'm using Windows 7 Ultimate x64)
