NullRefererenceException

Question

foreach (string line in assigment_lines)
    {
        // Object reference not set to an instance of 
        chars.AddRange(line.Split('=')); object.
    }
   string[] strArray = chars.ToArray();

My program give me Null Reference Exception in above code what a problem ?

Either `chars` is null or one of the `line`s in `assignment_lines` is null. — Devin Burke, Dec 24 '11 at 23:44
Welcome to the site - please write a proper title in order for people to better understand your questions at a glance. See http://meta.stackexchange.com/questions/18614/style-guide-for-questions-and-answers for more. — BoltClock, Dec 24 '11 at 23:45
Too localized. As a developer, this sort of thing *must* be debugged/fixed by yourself. Look at the call-stack, reason what value might be null, and/ or use a debugger. In the code posted there are only two member invocations on the line, which is why Justin Satyr could easily point out which expressions *could* be null. — , Dec 24 '11 at 23:46
@BoltClock Not sure there is a "proper title" for this question :( — , Dec 24 '11 at 23:46
His previous question is directly related to this: http://stackoverflow.com/questions/8620629/string-array-in-c-sharp — Dykam, Dec 24 '11 at 23:48
possible duplicate of [What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net) — John Saunders, Dec 24 '11 at 23:54

score 3 · Accepted Answer · answered Dec 24 '11 at 23:41

3

Make sure that line is not null also check where do you define chars array. You can do something like this:

foreach (string line in assigment_lines)
{
  if (!string.IsNullOrEmpty(line)) {  
      chars.AddRange(line.Split('=')); // Object reference not set to an instance of object.
  }
}
string[] strArray = chars.ToArray();

answered Dec 24 '11 at 23:41

Tim

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But one more question 4 u yesterday i run this program its running ok but when i run today it give me exception why ? – Muhammad Faisal Dec 24 '11 at 23:46
Perhaps you have used different data? Also could be that line.Split does return null if it can't split – Tim Dec 24 '11 at 23:48
@muhammad - its xmas eve so magical things tend to happen. Or maybe assignment_lines is different for reasons only you can figure – Robert Levy Dec 25 '11 at 00:11

NullRefererenceException

1 Answers1