重写了节点的view、viewmodel关系，实现了对画布元素的选取功能，重构了底层依赖，添加了对net .Framework4.6.1以上的Framework类库支持

Library.Core/Flow/NodeModel/CompositeConditionNode.cs

@@ -0,0 +1,67 @@
+
+namespace Serein.Flow.NodeModel
+{
+
+    /// <summary>
+    /// 组合条件节点（用于条件区域）
+    /// </summary>
+    public class CompositeConditionNode : NodeBase
+    {
+        public List<SingleConditionNode> ConditionNodes { get; } =[];
+
+
+        public void AddNode(SingleConditionNode node)
+        {
+            ConditionNodes.Add(node);
+            MethodDetails ??= node.MethodDetails;
+        }
+
+        public override object? Execute(DynamicContext context)
+        {
+            // bool allTrue = ConditionNodes.All(condition => Judge(context,condition.MethodDetails));
+            // bool IsAllTrue = true; // 初始化为 true
+            FlowState = true;
+            foreach (SingleConditionNode? node in ConditionNodes)
+            {
+                if (!Judge(context, node))
+                {
+                    FlowState = false;
+                    break;// 一旦发现条件为假，立即退出循环
+                }
+            }
+
+            return PreviousNode?.FlowData;
+            //if (IsAllTrue)
+            //{
+            //    foreach (var nextNode in TrueBranchNextNodes)
+            //    {
+            //        nextNode.ExecuteStack(context);
+            //    }
+            //}
+            //else
+            //{
+            //    foreach (var nextNode in FalseBranchNextNodes)
+            //    {
+            //        nextNode.ExecuteStack(context);
+            //    }
+            //}
+        }
+        private bool Judge(DynamicContext context, SingleConditionNode node)
+        {
+            try
+            {
+                node.Execute(context);
+                return node.FlowState;
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+            }
+            return false;
+        }
+
+
+
+    }
+
+}