fix #96

Assets/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs

@@ -77,9 +77,9 @@ namespace YooAsset
 		internal void SetFinish()
 		{
 			Progress = 1f;
-			_callback?.Invoke(this);
 			if (_taskCompletionSource != null)
 				_taskCompletionSource.TrySetResult(null);
+			_callback?.Invoke(this);
 		}
 		internal void SetStart()
 		{

Assets/YooAsset/Runtime/OperationSystem/OperationSystem.cs

@@ -7,8 +7,7 @@ namespace YooAsset
 	internal class OperationSystem
 	{
 		private static readonly List<AsyncOperationBase> _operations = new List<AsyncOperationBase>(100);
-		private static readonly List<AsyncOperationBase> _addList = new List<AsyncOperationBase>(100);
-		private static readonly List<AsyncOperationBase> _removeList = new List<AsyncOperationBase>(100);
+		private static readonly List<AsyncOperationBase> _newList = new List<AsyncOperationBase>(100);
 
 		// 计时器相关
 		private static Stopwatch _watch;
@@ -47,39 +46,26 @@ namespace YooAsset
 			_frameTime = _watch.ElapsedMilliseconds;
 
 			// 添加新的异步操作
-			if (_addList.Count > 0)
+			if (_newList.Count > 0)
 			{
-				for (int i = 0; i < _addList.Count; i++)
-				{
-					var operation = _addList[i];
-					_operations.Add(operation);
-				}
-				_addList.Clear();
+				_operations.AddRange(_newList);
+				_newList.Clear();
 			}
 
 			// 更新所有的异步操作
-			foreach (var operation in _operations)
+			for (int i = _operations.Count - 1; i >= 0; i--)
 			{
 				if (IsBusy)
 					break;
 
+				var operation = _operations[i];
 				operation.Update();
 				if (operation.IsDone)
 				{
-					_removeList.Add(operation);
-					operation.SetFinish();
+					_operations.RemoveAt(i);
+					operation.SetFinish(); //注意：如果业务端发生异常，保证异步操作提前移除。
 				}
 			}
-
-			// 移除已经完成的异步操作
-			if (_removeList.Count > 0)
-			{
-				foreach (var operation in _removeList)
-				{
-					_operations.Remove(operation);
-				}
-				_removeList.Clear();
-			}
 		}
 
 		/// <summary>
@@ -88,8 +74,7 @@ namespace YooAsset
 		public static void DestroyAll()
 		{
 			_operations.Clear();
-			_addList.Clear();
-			_removeList.Clear();
+			_newList.Clear();
 			_watch = null;
 			_frameTime = 0;
 			MaxTimeSlice = long.MaxValue;
@@ -100,7 +85,7 @@ namespace YooAsset
 		/// </summary>
 		public static void StartOperation(AsyncOperationBase operation)
 		{
-			_addList.Add(operation);
+			_newList.Add(operation);
 			operation.SetStart();
 			operation.Start();
 		}