Adding unknow GameObjects to a List or Array.

Hi people of Unity!

My project where i'm working for is more model based as gaming related.
I'm trying to extract information from a model made in Unity to a .txt file.
At the moment, it works pretty well. I just need some little changes but i struggle with adding ALL the GameObject to an array (or list). I only can add one tag or just one object to the array (or list).

(Wall and Floor are just examples. The names of the objects are unknown)

Code (CSharp):

1. using UnityEngine;
2. using System;
3. using UnityEditor;
4. using UnityEngine.UI;   //For Canvas, InputField, ..
5. using System.Collections.Generic;   //For list

Code (CSharp):

1. public GameObject[] objecten;

Code (CSharp):

1.         objecten = GameObject.FindGameObjectsWithTag("Wall");   //Need change tag to everything exept "Untagged"
2.         objecten = GameObject.FindGameObjectsWithTag("Floor");  // += doesn't work
3.  

If i do this, i only get the GameObjects with the "Floor" tag in my list called "objecten".
When I try it with a list in stead of an array, both Floor and Wall tagged GameObjects will be added to the list, but the problem is that i need to know the names of the GameObjects. (or how many taggs there will be used) This isn't known, becaus I can't know how many GameObjects it will take to make the model and how the user will name the Objects.

Code (CSharp):

1.     List<GameObject> objecten = new List<GameObject>();     //empty list to begin with.
2.  

Code (CSharp):

1.         objecten.Add(GameObject.Find("Wall"));
2.         objecten.Add(GameObject.Find("Floor"));
3.  

I'm already searching for 3 days in the tutorials, forums, answers and youtube to find a solution but i don't find anything relevant.

I thought about different ideas, but I can't translate them into code.
1: Let the user use taggs. Place all gameobjects except the untagged into a list/array
2: Extract all the names of the gameobjects (names go to list/array and i = length of array/count of list). Foreach name in list/array: objecten = GameObject.FindGameObjectsWithTag(" the name of gameobject ").
3: Mayby some wierd shizzle with Renderer, becaus every Object has a renderer component.

And yes I need to do this with Unity. I know there are better programs to make models to extract information from, but i'm only able to use Unity for this project.
Thanks for your time. I hope you can help me.

 

You need to know the name of the GameObject that you have in your ArrayList?

Code (csharp):

1. public string gameObjectName = objecten[x].gameObject.name;

http://docs.unity3d.com/ScriptReference/Object-name.html

 

Is there a way to make it easier for the user and extract the names from somewhere? I was thinking to get them from the hierarchy, but you can't get to those information

Already thanks for your time and effort

 

Code (csharp):

1. List<GameObject> objecten =new List<GameObject>();
2.  
3. objecten.AddRange(GameObject.FindGameObjectsWithTag("Wall"));
4. objecten.AddRange(GameObject.FindGameObjectsWithTag("Floor"));
5. ...etc

AddRange adds everything in a collection to the list.

There's also the brute-force approach:

Code (csharp):

1. GameObject[] allObjects = FindObjectsOfType<GameObject>();

 

Thanks guys!
You expanded my programming mind