How to overcome the Object reference error?

Question

last = res.LastOrDefault();//get the last string of res array
string[] final = last.Split(new char[] { '(' }).ToArray();

Am using the above code in my program.But there is a error is populated.

"object reference not set to an instance of an object " .How to overcome this?

pritaeas · Answer

last = res.LastOrDefault(); string [] final = last == null ? new string [0] : last.Split( new char [] { '(' }).ToArray(); LastOrDefault can return null. Check and return an empty array when true or your split when false.

pritaeas · Answer

Hard to say without the code. What line exactly fails? Show your updated code. What exactly are you running in a scheduler and which scheduler are you using? Can you show a stack trace?

Dinesh Santhalingam · Answer

The program runs fine.When i put into a scheduler then the error repeat.@ pritaeas

pritaeas · Answer

If res is indeed null I recommend the following over catching and ignoring any exceptions: last = res?.LastOrDefault(); string [] final = last == null ? new string [0] : last.Split( new char [] { '(' }).ToArray();

Rafnas T P · Answer

I think in res array doesnt have value please check wha value are you getting in res by putting breakpoint if you want to externally ignore this error then you can use try catch on thes linse try { last = res.LastOrDefault(); //get the last string of res array string [] final = last.Split( new char [] { '(' }).ToArray(); } catch {}

Dinesh Santhalingam · Answer

Thanks for your valuable time.@ pritaeas