GIT练习

Library/DynamicFlow/NodeModel/SingleExpOpNode.cs

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+using Serein.DynamicFlow.SerinExpression;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.DynamicFlow.NodeModel
+{
+    /// <summary>
+    /// Expression Operation - 表达式操作
+    /// </summary>
+    public class SingleExpOpNode : NodeBase
+    {
+        public string Expression { get; set; }
+
+
+        public override object? Execute(DynamicContext context)
+        {
+            //if (PreviousNode != null && PreviousNode.FlowData == null)
+            //{
+            //    // 存在
+            //    throw new InvalidOperationException("previous node data is null.");
+            //}
+            //else
+            //{
+
+            //}
+            var data = PreviousNode?.FlowData;
+            var newData = SerinExpressionEvaluator.Evaluate(Expression, data, out bool isChange);
+            FlowState = true;
+            Console.WriteLine(newData);
+            if (isChange)
+            {
+                return newData;
+            }
+            else
+            {
+                return PreviousNode?.FlowData;
+            }
+
+        }
+    }
+}