Why I keep getting exception UnityException: Transform child out of bounds ?

Code (csharp):

1.  
2. List<Transform> children = new List<Transform>();
3.  
4.         for (int i = 0; i < doors.Count; i++)
5.         {
6.             foreach (Transform child in doors[i].GetComponentsInChildren<Transform>())
7.             {
8.                 children.Add(child.GetChild(0));
9.             }
10.         }
11.  

There are two doors. Door_Left and Door_Right
Each door have a child. Door_Left child name is DoorShieldFXLocked (1)
And Door_Right child name is DoorShieldFXLocked

I'm trying to add both DoorShieldFXLocked (1) and DoorShieldFXLocked to the List children
when using break point I see that it's adding the first DoorShieldFXLocked (1) but on the next loop when it stop on the line:

Code (csharp):

1.  
2. children.Add(child.GetChild(0));
3.  

I'm getting the exception:

UnityException: Transform child out of bounds
At HoriDoorManager.cs:60

Line 60 is:

Code (csharp):

1.  
2. children.Add(child.GetChild(0));
3.  

 

You're already itterating through the children using

Code (CSharp):

1. foreach (Transform child in doors[i].GetComponentsInChildren<Transform>())

Add the children using

Code (CSharp):

1. children.Add(child);

The reason your code isn't working is because GetComponentsInChildren actually gets all the child transforms.

 

The problem now is that it's also adding to the children List the parents:

Code (csharp):

1.  
2. List<Transform> children = new List<Transform>();
3.  
4.         for (int i = 0; i < doors.Count; i++)
5.         {
6.             foreach (Transform child in doors[i].GetComponentsInChildren<Transform>())
7.             {
8.                 children.Add(child);
9.             }
10.         }
11.  

It should add to children only the child of each door. Each door have one child and there are two doors.
So in the end in children there should be 2 items. But there are 4 also the two doors.

How can I add only the child of each door without the parents(doors) ?

 

GetComponentsInChildren returns objects found in the object you are searching and its children. So, just skip the parent;

Code (CSharp):

1.         List<Transform> children = new List<Transform>();
2.  
3.         for (int i = 0; i < doors.Count; i++)
4.         {
5.             foreach (Transform child in doors[i].GetComponentsInChildren<Transform>())
6.             {
7.                 if (child == doors[i].transform)
8.                     continue;
9.  
10.                 children.Add(child);
11.             }
12.         }