优化更新代码，添加界面功能并整合

ShrlAlgo.Addin.Test/SetHeight.cs

@@ -0,0 +1,50 @@
+using Autodesk.Revit.Attributes;
+using Autodesk.Revit.DB;
+using Autodesk.Revit.UI;
+
+namespace ShrlAlgo.Addin.Test
+{
+    [Transaction(TransactionMode.Manual)]
+    [Regeneration(RegenerationOption.Manual)]
+    public class SetHeight : IExternalCommand
+    {
+        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
+        {
+            //程序UI界面
+            var uiapp = commandData.Application;
+            //获取元素（选择） 显示元素 视图（活动视图）管理（对象）
+            var uidoc = uiapp.ActiveUIDocument;
+            //程序
+            var app = uiapp.Application;
+            //获取位置和场地 视图（多个视图）管理 获取元素（Revit 项目里的全部元素）
+            var doc = uidoc.Document;
+            //获取所有打开文档
+            var docset = uiapp.Application.Documents;
+            //当前视图
+            var view = doc.ActiveView;
+
+            var ids = uidoc.Selection.GetElementIds();
+            using (var ts = new Transaction(doc, "设置净高"))
+            {
+                ts.Start();
+                try
+                {
+                    foreach (var id in ids)
+                    {
+                        var elem = doc.GetElement(id);
+                        var param = elem.GetParameters("h").FirstOrDefault();
+                        var height = elem.GetParameters("净高").FirstOrDefault();
+                        height.Set(param.AsValueString());
+                    }
+                }
+                catch (Exception)
+                {
+                    return Result.Failed;
+                }
+
+                ts.Commit();
+            }
+            return Result.Succeeded;
+        }
+    }
+}