NullReferenceException When setting a parram

Asked Dec 28 '15 at 19:34

Active Dec 29 '15 at 07:00

Viewed 41 times

I am trying to solve this problem on my own, but the error keeps on showing up: System.NullReferenceException: Object reference not set to an instance of an object The lines that are causing this are :

line = new LinearLayout(this);
lisCount++;
lis[lisCount] = line;
line.SetBackgroundColor(Color.Rgb(12, 155, 12));
var lineParams = line.LayoutParameters; // <- line with exception
lineParams.Width = ViewGroup.LayoutParams.MatchParent;

Can Anyone help me?

EDIT: Changed to:

line = new LinearLayout(this);
line.LayoutParameters = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MatchParent,
     ViewGroup.LayoutParams.WrapContent);lisCount++;
lis[lisCount] = line;
line.SetBackgroundColor(Color.Rgb(12, 155, 12));
var lineParams = line.LayoutParameters;
lineParams.Width = ViewGroup.LayoutParams.MatchParent;`

The problem now is that the LinearLayout disappears alltoghether

edited Dec 29 '15 at 07:00

Coding with Cookie

asked Dec 28 '15 at 19:34

Bogdan Constantin

My money is on `lineParams` being null. Voting to close for lack of context. – Matt Clark Dec 28 '15 at 19:35
tell me what do you need and i`ll povide... – Bogdan Constantin Dec 28 '15 at 19:37
Possible duplicate of [What is a NullReferenceException and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) – David Dec 28 '15 at 19:37
More context, where do you assign a value to `lineParams`? – Matt Clark Dec 28 '15 at 19:37
The variable "line" must be null in 5th line of code you posted. Please, check if there is another parallel code (another thread) that is clearing "lis" or "line" variables. – Dec 28 '15 at 19:43
I am pretty sure it does not... – Bogdan Constantin Dec 28 '15 at 19:46
1

@BogdanConstantin: What you're "pretty sure" of is irrelevant. What you validate from debugging matters. – David Dec 28 '15 at 20:02
"pretty sure" means that i`ve debugged it... – Bogdan Constantin Dec 29 '15 at 10:36
What is the purpose of this code anyways? Are you making a list of something? If so, why are you not using a ListView? – Cheesebaron Jan 04 '16 at 16:09

NullReferenceException When setting a parram

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