编写部件组装逻辑（还差排序逻辑未完成）

DeedyDesigner/Deedy.Activity/Attribute/CombinePartActionAttribute.cs

@@ -10,6 +10,7 @@ namespace Deedy.Activity
     [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
     public class CombinePartActionAttribute : Attribute, IInitialSortable
     {
+        public const string CombinePartSign = "CombinePartSign";
         public CombinePartActionAttribute(int initSort) { this.InitialSort = initSort; }
 
         public int InitialSort { get; set; } = 0;

DeedyDesigner/Deedy.Activity/Collection/ExpandoMapping.cs

@@ -14,5 +14,16 @@ namespace Deedy.Activity
     [DebuggerDisplay("Count = {Count}")]
     public class ExpandoMapping : Dictionary<string, string>
     {
+        public ExpandoMapping() { }
+        public void SetValue(string key, string value)
+        {
+            if (this.ContainsKey(key)) this[key] = value;
+            else this.Add(key, value);
+        }
+        public string GetValue(string key)
+        {
+            if (!this.ContainsKey(key)) this.Add(key, string.Empty);
+            return this[key];
+        }
     }
 }

DeedyDesigner/Deedy.Activity/Helpers/ActionHelper.cs

@@ -127,6 +127,43 @@ namespace Deedy.Activity
             return allow;
         }
         /// <summary>
+        /// 将使用部件声明特性声明的动作部件与主体组装到一起并连接
+        /// </summary>
+        /// <param name="combined"></param>
+        public static void Help_CombineElements(this ICombinedElement combined)
+        {
+            if (combined == null) return;
+            if (combined.Elements == null) combined.Elements = [];
+            var props = combined.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.GetField | BindingFlags.SetField);
+            foreach (var prop in props)
+            {
+                if (prop.CanWrite && prop.CanRead)
+                {
+                    if (!prop.PropertyType.IsAssignableFrom(typeof(IElement))) continue;
+
+                    bool hasPart = false;
+                    foreach (var element in combined.Elements)
+                    {
+                        if (element.Help_GetAttachValue(CombinePartActionAttribute.CombinePartSign) == prop.Name)
+                        {
+                            element.LinkTo(combined);
+                            prop.SetValue(combined, element);
+                            hasPart = true;
+                            break;
+                        }
+                    }
+                    if (!hasPart)
+                    {
+                        IElement? partElement = prop.GetValue(combined) as IElement;
+                        if (partElement == null) continue;
+                        combined.Elements.Add(partElement);
+                        partElement.LinkTo(combined);
+                        partElement.Help_SetAttachValue(CombinePartActionAttribute.CombinePartSign, prop.Name);
+                    }
+                }
+            }
+        }
+        /// <summary>
         /// 将一个元素插入到可变容器的指定位置
         /// </summary>
         /// <param name="this">可变元素容器</param>

DeedyDesigner/Deedy.Activity/Helpers/ActivityHelper.cs

@@ -9,5 +9,16 @@ namespace Deedy.Activity
     public static partial class Helper
     {
         //TODO：管理附加属性与准备方法
+        public static string Help_GetAttachValue(this IActivity activity, string key)
+        {
+            if (activity == null || activity.ExpandoMapping == null) return string.Empty;
+            return activity.ExpandoMapping.GetValue(key);
+        }
+        public static void Help_SetAttachValue(this IActivity activity, string key, string value)
+        {
+            if (activity == null) return;
+            if (activity.ExpandoMapping == null) activity.ExpandoMapping = [];
+            activity.ExpandoMapping.SetValue(key, value);
+        }
     }
 }