Object reference not set to an instance of an object (C#)

Question

I can't seem to get this working, I'm getting an error once opening my c# project file (.exe) and it says "object reference not set to an instance of an object". Here's the line and the one below it.

// Update the actual position

Actor.Position = new Vector3(
                        Actor.PositionToSet.X, 
                        Actor.PositionToSet.Y, 
                        (Math.Round(
                            GetUserStepHeight(
                                Actor.PositionToSet),
                                1)));

Actor.PositionToSet = null;

Aniket Inge · Accepted Answer · 2013-11-10 05:35:58Z

1

The possibility is, either 1. Actor is null or 2. Actor.PositionToSet is null.

To check, either have this:

if(Actor == null){
    System.Console.WriteLine("Actor is NULL");
}

if(Actor.PositionToSet == null){
    System.Console.WriteLine("Actor.PositionToSet is NULL");
}

or use the LINE BY LINE debugger in Visual Studio.

Here is a piece of advice I got years ago:

Think before you code, and build a mental model of the code, then when things break, just reflect on what went wrong without looking at the code.
Unit test your code, make it a standard practice of your coding methodology. This will save you years of debugging time.

answered Nov 10, 2013 at 5:35

Aniket Inge

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7 Comments

user2975533 Over a year ago

well Actor.PositionToSet is null??

Aniket Inge Over a year ago

@user2975533 is it NULL? Actor.PositionToSet?

user2975533 Over a year ago

well the line says Actor.PositionToSet = null; on the next line. the main line is the middle one.

Aniket Inge Over a year ago

@user2975533 are you sure, Actor.PositionToSet is not NULL before you set it to NULL? Just asking, add the lines of code I posted, before the middle one, and tell me what you see.

user2975533 Over a year ago

It's working perfectly now, The file used to close when I went over a certain block in my game and it would crash the "Emulator". Now it just shows loads of lines in the console when i go over one :P Thanks though!

|

Nikhil Agrawal · Accepted Answer · 2013-11-10 06:05:30Z

0

Please check that Actor or Actor.PositionToSet is not null. That is the only reason.

edited Nov 10, 2013 at 6:05

answered Nov 10, 2013 at 5:32

Nikhil Agrawal

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1 Comment

user2975533 Over a year ago

Sorry but I'm new, how?:S

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