• Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
  • Asset Store
  • Get Unity

UNITY ACCOUNT

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account
  • Blog
  • Forums
  • Answers
  • Evangelists
  • User Groups
  • Beta Program
  • Advisory Panel

Navigation

  • Home
  • Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
    • Blog
    • Forums
    • Answers
    • Evangelists
    • User Groups
    • Beta Program
    • Advisory Panel

Unity account

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account

Language

  • Chinese
  • Spanish
  • Japanese
  • Korean
  • Portuguese
  • Ask a question
  • Spaces
    • Default
    • Help Room
    • META
    • Moderators
    • Topics
    • Questions
    • Users
    • Badges
  • Home /
avatar image
0
Question by fantasyMe · Jul 26, 2011 at 09:52 AM · nullmultidimarray

c# 2D array error: need Help!

 public void SetWorldMapOutline()
 {
     
     worldMap = new MapTileData[700, 700];
     for (int y = 0; y < 700; y++)
     {
         axisY = size - y;
         for (int x = 0; x < 700; x++)
         {
         
                 
                 worldMap[y, x].X = 0;
                 
             
         }
     }
 }

 

worldMap[y,x] is null. I do not understand why?

Comment
Add comment
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users

1 Reply

· Add your reply
  • Sort: 
avatar image
1
Best Answer

Answer by IainStanford · Jul 26, 2011 at 10:39 AM

Although you have instantiated an array of [700,700] MapTileData objects, you haven't instatiated the objects wit$$anonymous$$n that array, the following line

 worldMap = new MapTileData[700,700]

makes an array for the objects, but doesn't create the actual objects wit$$anonymous$$n it. To fill the array you have to iterate over all the objects and do somet$$anonymous$$ng along the lines of,

 for(int i=0; i<700; i++){
    for(int j=0; j<700; j++){
       worldMap[i,j] = new MapTileData();
    }
 }


So what you could have at the end is...

 public void SetWorldMapOutline()

{

 worldMap = new MapTileData[700, 700];
 for (int y = 0; y < 700; y++)
 {
     axisY = size - y;
     for (int x = 0; x < 700; x++)
     {


             worldMap[y, x] = new MapTileData();
             worldMap[y, x].X = 0;


     }
 }

}

or similar.

Comment
Add comment · Show 1 · Share
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users
avatar image fantasyMe · Jul 27, 2011 at 01:14 AM 0
Share

Thanks! It is work

Your answer

Hint: You can notify a user about this post by typing @username

Up to 2 attachments (including images) can be used with a maximum of 524.3 kB each and 1.0 MB total.

Welcome to Unity Answers

If you’re new to Unity Answers, please check our User Guide to help you navigate through our website and refer to our FAQ for more information.

Before posting, make sure to check out our Knowledge Base for commonly asked Unity questions.

Check our Moderator Guidelines if you’re a new moderator and want to work together in an effort to improve Unity Answers and support our users.

Follow this Question

Answers Answers and Comments

3 People are following this question.

avatar image avatar image avatar image

Related Questions

UnityEngine Assert IsNotNull not working on empty inspector field 1 Answer

How to stop loading of a scene that's loading using SceneManager.LoadSceneAsync ? 1 Answer

What does this statement construction mean?: if (null != anim) 1 Answer

NullReferenceException MaskableGraphic.UpdateCull() upon Loading Player Data. 0 Answers

What is the difference between "prefix-casting" (Type)variable - and "as-casting" (variable as Type)? 2 Answers


Enterprise
Social Q&A

Social
Subscribe on YouTube social-youtube Follow on LinkedIn social-linkedin Follow on Twitter social-twitter Follow on Facebook social-facebook Follow on Instagram social-instagram

Footer

  • Purchase
    • Products
    • Subscription
    • Asset Store
    • Unity Gear
    • Resellers
  • Education
    • Students
    • Educators
    • Certification
    • Learn
    • Center of Excellence
  • Download
    • Unity
    • Beta Program
  • Unity Labs
    • Labs
    • Publications
  • Resources
    • Learn platform
    • Community
    • Documentation
    • Unity QA
    • FAQ
    • Services Status
    • Connect
  • About Unity
    • About Us
    • Blog
    • Events
    • Careers
    • Contact
    • Press
    • Partners
    • Affiliates
    • Security
Copyright © 2020 Unity Technologies
  • Legal
  • Privacy Policy
  • Cookies
  • Do Not Sell My Personal Information
  • Cookies Settings
"Unity", Unity logos, and other Unity trademarks are trademarks or registered trademarks of Unity Technologies or its affiliates in the U.S. and elsewhere (more info here). Other names or brands are trademarks of their respective owners.
  • Anonymous
  • Sign in
  • Create
  • Ask a question
  • Spaces
  • Default
  • Help Room
  • META
  • Moderators
  • Explore
  • Topics
  • Questions
  • Users
  • Badges