Fixed #26

修复多个场景打进一个AB包时，卸载子场景时抛出异常。

Assets/YooAsset/Runtime/AssetSystem/AssetSystem.cs

@@ -11,6 +11,7 @@ namespace YooAsset
 		private static readonly List<AssetBundleLoaderBase> _loaders = new List<AssetBundleLoaderBase>(1000);
 		private static readonly List<ProviderBase> _providers = new List<ProviderBase>(1000);
 		private static readonly Dictionary<string, SceneOperationHandle> _sceneHandles = new Dictionary<string, SceneOperationHandle>(100);
+		private static long _sceneCreateCount = 0;
 
 		private static bool _simulationOnEditor;
 		private static int _loadingMaxNumber;
@@ -144,24 +145,20 @@ namespace YooAsset
 				return completedProvider.CreateHandle<SceneOperationHandle>();
 			}
 
-			// 注意：场景句柄永远保持唯一
-			string providerGUID = assetInfo.ProviderGUID;
-			if (_sceneHandles.ContainsKey(providerGUID))
-				return _sceneHandles[providerGUID];
-
 			// 如果加载的是主场景，则卸载所有缓存的场景
 			if (sceneMode == LoadSceneMode.Single)
 			{
 				UnloadAllScene();
 			}
 
-			ProviderBase provider = TryGetProvider(providerGUID);
+			// 注意：同一个场景的ProviderGUID每次加载都会变化
-			if (provider == null)
+			string providerGUID = $"{assetInfo.GUID}-{++_sceneCreateCount}";
+			ProviderBase provider;
 			{
 				if (_simulationOnEditor)
-					provider = new DatabaseSceneProvider(assetInfo, sceneMode, activateOnLoad, priority);
+					provider = new DatabaseSceneProvider(providerGUID, assetInfo, sceneMode, activateOnLoad, priority);
 				else
-					provider = new BundledSceneProvider(assetInfo, sceneMode, activateOnLoad, priority);
+					provider = new BundledSceneProvider(providerGUID, assetInfo, sceneMode, activateOnLoad, priority);
 				provider.InitSpawnDebugInfo();
 				_providers.Add(provider);
 			}
@@ -183,13 +180,14 @@ namespace YooAsset
 				return completedProvider.CreateHandle<AssetOperationHandle>();
 			}
 
-			ProviderBase provider = TryGetProvider(assetInfo.ProviderGUID);
+			string providerGUID = assetInfo.GUID;
+			ProviderBase provider = TryGetProvider(providerGUID);
 			if (provider == null)
 			{
 				if (_simulationOnEditor)
-					provider = new DatabaseAssetProvider(assetInfo);
+					provider = new DatabaseAssetProvider(providerGUID, assetInfo);
 				else
-					provider = new BundledAssetProvider(assetInfo);
+					provider = new BundledAssetProvider(providerGUID, assetInfo);
 				provider.InitSpawnDebugInfo();
 				_providers.Add(provider);
 			}
@@ -208,13 +206,14 @@ namespace YooAsset
 				return completedProvider.CreateHandle<SubAssetsOperationHandle>();
 			}
 
-			ProviderBase provider = TryGetProvider(assetInfo.ProviderGUID);
+			string providerGUID = assetInfo.GUID;
+			ProviderBase provider = TryGetProvider(providerGUID);
 			if (provider == null)
 			{
 				if (_simulationOnEditor)
-					provider = new DatabaseSubAssetsProvider(assetInfo);
+					provider = new DatabaseSubAssetsProvider(providerGUID, assetInfo);
 				else
-					provider = new BundledSubAssetsProvider(assetInfo);
+					provider = new BundledSubAssetsProvider(providerGUID, assetInfo);
 				provider.InitSpawnDebugInfo();
 				_providers.Add(provider);
 			}
@@ -223,7 +222,7 @@ namespace YooAsset
 
 		internal static void UnloadSubScene(ProviderBase provider)
 		{
-			string providerGUID = provider.MainAssetInfo.ProviderGUID;
+			string providerGUID = provider.ProviderGUID;
 			if (_sceneHandles.ContainsKey(providerGUID) == false)
 				throw new Exception("Should never get here !");
 
@@ -233,12 +232,6 @@ namespace YooAsset
 
 			// 卸载未被使用的资源（包括场景）
 			AssetSystem.UnloadUnusedAssets();
-
-			// 检验子场景是否销毁
-			if (provider.IsDestroyed == false)
-			{
-				throw new Exception("Should never get here !");
-			}
 		}
 		internal static void UnloadAllScene()
 		{
@@ -251,16 +244,6 @@ namespace YooAsset
 
 			// 卸载未被使用的资源（包括场景）
 			AssetSystem.UnloadUnusedAssets();
-
-			// 检验所有场景是否销毁
-			foreach (var provider in _providers)
-			{
-				if (provider.IsSceneProvider())
-				{
-					if (provider.IsDestroyed == false)
-						throw new Exception("Should never get here !");
-				}
-			}
 		}
 
 		internal static AssetBundleLoaderBase CreateOwnerAssetBundleLoader(AssetInfo assetInfo)
@@ -324,7 +307,7 @@ namespace YooAsset
 			for (int i = 0; i < _providers.Count; i++)
 			{
 				ProviderBase temp = _providers[i];
-				if (temp.MainAssetInfo.ProviderGUID.Equals(providerGUID))
+				if (temp.ProviderGUID.Equals(providerGUID))
 				{
 					provider = temp;
 					break;

Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleLoaderBase.cs

@@ -130,14 +130,14 @@ namespace YooAsset
 			if (IsDone() == false)
 				return;
 
-			// 注意：必须等待所有Provider可以销毁的时候，才可以释放Bundle文件。
+			// 条件1：必须等待所有Provider可以销毁
 			foreach (var provider in _providers)
 			{
 				if (provider.CanDestroy() == false)
 					return;
 			}
 
-			// 除了自己没有其它引用
+			// 条件2：除了自己没有其它引用
 			if (RefCount > _providers.Count)
 				return;
 

Assets/YooAsset/Runtime/AssetSystem/Provider/BundledAssetProvider.cs

@@ -17,7 +17,7 @@ namespace YooAsset
 			}
 		}
 
-		public BundledAssetProvider(AssetInfo assetInfo) : base(assetInfo)
+		public BundledAssetProvider(string providerGUID, AssetInfo assetInfo) : base(providerGUID, assetInfo)
 		{
 		}
 		public override void Update()

Assets/YooAsset/Runtime/AssetSystem/Provider/BundledProvider.cs

@@ -8,7 +8,7 @@ namespace YooAsset
 		protected AssetBundleLoaderBase OwnerBundle { private set; get; }
 		protected DependAssetBundleGroup DependBundleGroup { private set; get; }
 
-		public BundledProvider(AssetInfo assetInfo) : base(assetInfo)
+		public BundledProvider(string providerGUID, AssetInfo assetInfo) : base(providerGUID, assetInfo)
 		{
 			OwnerBundle = AssetSystem.CreateOwnerAssetBundleLoader(assetInfo);
 			OwnerBundle.Reference();

Assets/YooAsset/Runtime/AssetSystem/Provider/BundledSceneProvider.cs

@@ -23,7 +23,7 @@ namespace YooAsset
 			}
 		}
 
-		public BundledSceneProvider(AssetInfo assetInfo, LoadSceneMode sceneMode, bool activateOnLoad, int priority) : base(assetInfo)
+		public BundledSceneProvider(string providerGUID, AssetInfo assetInfo, LoadSceneMode sceneMode, bool activateOnLoad, int priority) : base(providerGUID, assetInfo)
 		{
 			SceneMode = sceneMode;
 			_sceneName = Path.GetFileNameWithoutExtension(assetInfo.AssetPath);

Assets/YooAsset/Runtime/AssetSystem/Provider/BundledSubAssetsProvider.cs

@@ -17,7 +17,7 @@ namespace YooAsset
 			}
 		}
 
-		public BundledSubAssetsProvider(AssetInfo assetInfo) : base(assetInfo)
+		public BundledSubAssetsProvider(string providerGUID, AssetInfo assetInfo) : base(providerGUID, assetInfo)
 		{
 		}
 		public override void Update()

Assets/YooAsset/Runtime/AssetSystem/Provider/CompletedProvider.cs

@@ -14,7 +14,7 @@ namespace YooAsset
 			}
 		}
 
-		public CompletedProvider(AssetInfo assetInfo) : base(assetInfo)
+		public CompletedProvider(AssetInfo assetInfo) : base(string.Empty, assetInfo)
 		{
 		}
 		public override void Update()

Assets/YooAsset/Runtime/AssetSystem/Provider/DatabaseAssetProvider.cs

@@ -17,7 +17,7 @@ namespace YooAsset
 			}
 		}
 
-		public DatabaseAssetProvider(AssetInfo assetInfo) : base(assetInfo)
+		public DatabaseAssetProvider(string providerGUID, AssetInfo assetInfo) : base(providerGUID, assetInfo)
 		{
 		}
 		public override void Update()

Assets/YooAsset/Runtime/AssetSystem/Provider/DatabaseSceneProvider.cs

@@ -19,7 +19,7 @@ namespace YooAsset
 			}
 		}
 
-		public DatabaseSceneProvider(AssetInfo assetInfo, LoadSceneMode sceneMode, bool activateOnLoad, int priority) : base(assetInfo)
+		public DatabaseSceneProvider(string providerGUID, AssetInfo assetInfo, LoadSceneMode sceneMode, bool activateOnLoad, int priority) : base(providerGUID, assetInfo)
 		{
 			SceneMode = sceneMode;
 			_activateOnLoad = activateOnLoad;

Assets/YooAsset/Runtime/AssetSystem/Provider/DatabaseSubAssetsProvider.cs

@@ -17,7 +17,7 @@ namespace YooAsset
 			}
 		}
 
-		public DatabaseSubAssetsProvider(AssetInfo assetInfo) : base(assetInfo)
+		public DatabaseSubAssetsProvider(string providerGUID, AssetInfo assetInfo) : base(providerGUID, assetInfo)
 		{
 		}
 		public override void Update()

Assets/YooAsset/Runtime/AssetSystem/Provider/ProviderBase.cs

@@ -17,6 +17,11 @@ namespace YooAsset
 			Fail,
 		}
 
+		/// <summary>
+		/// 资源提供者唯一标识符
+		/// </summary>
+		public string ProviderGUID { private set; get; }
+
 		/// <summary>
 		/// 资源信息
 		/// </summary>
@@ -85,8 +90,9 @@ namespace YooAsset
 		private readonly List<OperationHandleBase> _handles = new List<OperationHandleBase>();
 
 
-		public ProviderBase(AssetInfo assetInfo)
+		public ProviderBase(string providerGUID, AssetInfo assetInfo)
 		{
+			ProviderGUID = providerGUID;
 			MainAssetInfo = assetInfo;
 		}
 

Assets/YooAsset/Runtime/PatchSystem/AssetInfo.cs

@@ -7,9 +7,9 @@ namespace YooAsset
 		private string _providerGUID;
 
 		/// <summary>
-		/// 资源提供者唯一标识符
+		/// 唯一标识符
 		/// </summary>
-		internal string ProviderGUID
+		internal string GUID
 		{
 			get
 			{