Array of custom properties? (C#)

Question

Hello,

i have a custom class:

 public class jetInfo
 {
     public string JetName{ get; set;}
 }

i need to create an array of it so i tried:

 private jetInfo[] JetData = new jetInfo[3];

but when i'm trying to use it like this:

 JetData[0].JetName= "Arrow";

i'm getting error in runtime:

NullReferenceException: Object reference not set to an instance of an object

what am i doing wrong?

thanks!

Answer 1

Best Answer

Answer by Rustam-Ganeyev · Apr 11, 2014 at 12:41 PM

When you do

 private jetInfo[] JetData = new jetInfo[3];

you initialize array, where all its elements are null. All you need to do is:

 JetData[0] = new jetInfo();

before

 JetData[0].JetName= "Arrow";

P.S. I'd recommend to initialize array contents before using:

 for (int i = 0; i < JetData.Length; ++i) {
   JetData[i] = new JetInfo();
 }

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haim96 · Apr 11, 2014 at 12:46 PM 0

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i tought that =new jetInfo[3]; already initialize the array...

works like a charm! thanks...

Rustam-Ganeyev · Apr 12, 2014 at 11:48 PM 0

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Actually, =new jetInfo[3] initializes the array. But array is an object that contains links to other objects(jetInfo), so you need to initialize object in array to use.

Array of custom properties? (C#)

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