实现了拖拽式设置方法调用顺序、方法入参参数来源

Library/Enums/ConnectionArgSourceType.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Library
+{
+
+    /// <summary>
+    /// 节点对应方法的入参来源
+    /// </summary>
+    public enum ConnectionArgSourceType
+    {
+        /// <summary>
+        /// （连接自身）从上一节点获取数据
+        /// </summary>
+        GetPreviousNodeData,
+        /// <summary>
+        /// 从指定节点获取数据
+        /// </summary>
+        GetOtherNodeData,
+        /// <summary>
+        /// 立刻执行某个节点获取其数据
+        /// </summary>
+        GetOtherNodeDataOfInvoke,
+    }
+}