重构了运行逻辑。上下文使用对象池封装，节点方法调用时间传递CancellationTokenSource用来中止任务

NodeFlow/FlowTaskLibrary.cs

@@ -0,0 +1,52 @@
+using Microsoft.Extensions.ObjectPool;
+using Serein.Library;
+using Serein.Library.Api;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.NodeFlow
+{
+
+    public class FlowTaskLibrary()
+    {
+        /// <summary>
+        /// 流程运行环境
+        /// </summary>
+        public IFlowEnvironment Environment { get; set; }// = environment;
+
+        /// <summary>
+        /// 表示运行环境状态
+        /// </summary>
+        public CancellationTokenSource CancellationTokenSource { get; } = new CancellationTokenSource();
+
+        /// <summary>
+        /// 上下文线程池
+        /// </summary>
+        public Serein.Library.Utils.ObjectPool<IDynamicContext> FlowContextPool { get; set; }   
+
+        /// <summary>
+        /// 当前任务加载的所有节点
+        /// </summary>
+        public List<NodeModelBase> Nodes { get; set; }// = nodes;
+        /// <summary>
+        /// 需要注册的类型
+        /// </summary>
+        public Dictionary<RegisterSequence, List<Type>> AutoRegisterTypes { get; set; } //= autoRegisterTypes;
+        /// <summary>
+        /// 初始化时需要的方法
+        /// </summary>
+        public List<MethodDetails> InitMds { get; set; }// = initMds;
+        /// <summary>
+        /// 加载时需要的方法
+        /// </summary>
+        public List<MethodDetails> LoadMds { get; set; }// = loadMds;
+        /// <summary>
+        /// 退出时需要调用的方法
+        /// </summary>
+        public List<MethodDetails> ExitMds { get; set; } //= exitMds;
+    }
+
+}