@MuhammadFaizanKhan @lovancon
I also needed this functionality so I made some changes to it in this fork:
https://gist.github.com/ytjchan/b32e54233895122ab9d51156dccf6ee4

Awesome! Thanks for sharing. For anyone else looking, if you need the subdirectories too, just add a SearchOption to the GetFiles Method like so
FileInfo[] fileInf = dirInfo.GetFiles("*.prefab",SearchOption.AllDirectories);

root folder should be directory of folders for this script to work that is a pre-condition

Personally I think static methods are just evil. I could see maybe see a justification if this were an extension method. Static methods/properties makes completely untestable code. I have all my game objects in a dll with DryIoc, so I can fully mock make game objects before using them in Unity. Makes for much faster development.

So, I re-modified this so you can apply an Func parameter. For instance, I want all prefabs to be loaded and I have a MonoBehavior that specifies it's scene name it can be loaded in.

using this code I can add custom validation code within the method.

` public List LoadPrefabsByScene(string sceneName)
{
return LoadAllPrefabsOfType("Assets/Resources/Prefabs", (x) => x.Scenes.Contains(sceneName))..Select(x => x.gameObject).ToList();
}

public List<T> LoadAllPrefabsOfType<T>(string path, Func<T, bool> evaluate) where T : MonoBehaviour
{
    if (path != "")
    {
        if (path.EndsWith("/"))
        {
            path = path.TrimEnd('/');
        }
    }

    DirectoryInfo dirInfo = new DirectoryInfo(path);
    FileInfo[] fileInf = dirInfo.GetFiles("*.prefab", SearchOption.AllDirectories);

    //loop through directory loading the game object and checking if it has the component you want
    List<T> prefabComponents = new List<T>();
    foreach (FileInfo fileInfo in fileInf)
    {
        string fullPath = fileInfo.FullName.Replace(@"\", "/");
        string assetPath = "Assets" + fullPath.Replace(Application.dataPath, "");
        GameObject prefab = AssetDatabase.LoadAssetAtPath(assetPath, typeof(GameObject)) as GameObject;

        if (prefab != null)
        {
            T hasT = prefab.GetComponent<T>();
            if (hasT != null)
            {
                // validate the expression
                if (evaluate.Invoke(hasT))
                {
                    prefabComponents.Add(hasT);
                }
            }
        }
    }
    return prefabComponents;
}`

Hope this helps someone, Cheers!