UnityEngine.Resources.UnloadAsset C# (CSharp) Method

		public static void UnloadAsset(System.Object assetToUnload){}
		public static AsyncOperation UnloadUnusedAssets(){}

        public void SetImageImmediate(string key, string resource = null, int order = 0, Action callBack = null)
        {
            if (string.IsNullOrEmpty(key))
            {
                return;
            }

            this.current = key;

            this.key = string.Empty;

            if (RenewablePool.Instance.Exist(cache, key, string.Empty))
            {
                m_texture = RenewablePool.Instance.Pop <Texture2D>(cache, key);

                this.key = key; callBack?.Invoke();

                SetTexture(m_texture);

                if (!RenewablePool.Instance.Recent(cache, key))
                {
                    this.key = string.Empty; Get(key, null, order, callBack);
                }
            }
            else
            {
                string path = string.Format("{0}/{1}", Application.persistentDataPath, key);

                if (RenewableFile.Exists(path))
                {
                    byte[] buffer = RenewableFile.Read(path);

                    bool recent = RenewableResourceUpdate.Instance.Validation(key, buffer);

                    Create(new RenewableDownloadHandler(key, string.Empty, string.Empty, recent, buffer, null));

                    if (recent)
                    {
                        this.key = key;

                        RenewableResourceUpdate.Instance.Remove(key);
                    }
                    else
                    {
                        Get(key, null, order, callBack);
                    }
                }
                else
                {
                    path = string.Format("{0}{1}", resource, key);

                    if (TryLoad <Texture2D>(path, out Texture2D source))
                    {
                        bool recent = RenewableResourceUpdate.Instance.Validation(key, null);

                        Create(new RenewableDownloadHandler(key, string.Empty, string.Empty, recent, null, Instantiate(source)));

                        Resources.UnloadAsset(source);

                        if (recent)
                        {
                            this.key = key;

                            RenewableResourceUpdate.Instance.Remove(key);
                        }
                        else
                        {
                            Get(key, null, order, callBack);
                        }
                    }
                    else
                    {
                        Get(key, null, order, callBack);
                    }
                }
            }
        }