Object Reference Not Set To Instance of an Object (XNA C#)

Question

I have a quick question about a piece of code that I wrote:

for (int x = 0; x < width; x++)
{
    for (int y = 0; y < height; y++)
    {
            map.Add(main.Stone);
            Vector2 vec = new Vector2(x * 16, y * 16);
            pos.Add(vec);
    }
}

I get an error at pos.Add(vec); saying that the reference is null even though I declared it in the line above. I am pretty new to XNA so it's probably something really simple, but I can't seem to figure it out.

Where is pos declared and initialized?

Lieven Keersmaekers
– Lieven Keersmaekers

2012-07-03 17:27:12 +00:00
Commented Jul 3, 2012 at 17:27 — Lieven Keersmaekers
– Lieven Keersmaekers, Commented Jul 3, 2012 at 17:27
pos is null. Check using debugger.

Nikhil Agrawal
– Nikhil Agrawal

2012-07-03 17:27:46 +00:00
Commented Jul 3, 2012 at 17:27 — Nikhil Agrawal
– Nikhil Agrawal, Commented Jul 3, 2012 at 17:27

Nikhil Agrawal · Accepted Answer · 2012-07-03 17:28:50Z

1

pos is null.

vec cannot be null as it is declared above using value type entity (integers).

Check using debugger.

answered Jul 3, 2012 at 17:28

Nikhil Agrawal

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Comments

egbrad · Accepted Answer · 2012-07-03 17:27:48Z

0

pos is the reference that is null, not vec. Where did you declare pos?

answered Jul 3, 2012 at 17:27

egbrad

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3 Comments

egbrad Over a year ago

Perhaps the main class was passing in a null value to the method. No way to tell without seeing some more of your code.

blueLine Over a year ago

It was being declared in my main method, then sent to this class from there via function parameters

blueLine Over a year ago

Oh >.< I fixed it. I had List<Vector2> Pos; and it wasn't instantiated yet. All I had to do was change it to List<Vector2> Pos = new List<Vector2>();.

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