Select FirstOrDefault() from RegistryKey

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I was able to get the following snippet working in a test app (V4.5 .Net Framework) that I developed, but when I copied the logic to my main application (V2.0 .Net Framework):

C#

string serviceName = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\").GetSubKeyNames().Where(s => s.StartsWith(editedServiceName)).FirstOrDefault();

string registryKeyPath = @"SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\" + serviceName;

I'm getting this error: "Object reference not set to an instance of an object." i.e. serviceName = null
The variable editedServiceName is valid and the registry exists (I checked it manually). Is the differences in the .Net Framework causing this error? Or what other reason is causing this to fail over at this point?

Posted 4-Jun-14 1:21am

pmcm

Updated 4-Jun-14 1:23am

v2

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Pikoh · Accepted Answer · 2014-06-04T01:26:00

That code is using LINQ, which by default is not in 2.0 .Net framework

EDIT

C#

string registryKeyPath;
string[] serviceNames = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\").GetSubKeyNames();

            foreach (string serviceName in serviceNames)
            {
                if (serviceName.StartsWith(editedServiceName)
                {  
                    registryKeyPath = @"SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\" + serviceName;
                    break;
                }
            }