check how many items are inside a resource folder code example
Example: unity how to tell how many objets are in a folder
void Start()
{
//I needed to get a count of my all level prefabs from my
//Resources folder so I hashed together this frankenstein code:
//Get the path of the Levels folder from Resources
string AssetsFolderPath = Application.dataPath;
string levelFolder = AssetsFolderPath + "/Resources/Levels";
Debug.Log("dataPath : " + levelFolder);
//////////////////////
//DirectoryInfo needs "using System.IO"
DirectoryInfo dir = new DirectoryInfo(levelFolder);
FileInfo[] info = dir.GetFiles("*.prefab");
int fileCount = info.Length;
Debug.Log("Level Count: " + fileCount);
//Clear array to save space, needs "using System"
Array.Clear(info, 0, info.Length);
}