Revit API“普通参数”和“类型属性参数”的区别

元素的参数分普通的属性参数和类型属性参数。
参数的值可能是一个整数，一个字符串，也可能是一个元素对象。比如是一种材质。
材质也分多种，管道有管道对齐的材质。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using WinForm = System.Windows.Forms;

using Autodesk.Revit.UI;
using Autodesk.Revit.DB;
using Autodesk.Revit.Attributes;

using Autodesk.Revit.DB.Mechanical;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.ApplicationServices;

using Autodesk.Revit.DB.Structure;
using Autodesk.Revit.DB.ExtensibleStorage;
using Autodesk.Revit.DB.Plumbing;
using Autodesk.Revit.DB.Architecture;

using System.Xml;

namespace RevitCodes
{

    [TransactionAttribute(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    public class cmdParameter : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string messages, ElementSet elements)
        {
            UIApplication uiApp = commandData.Application;
            Document doc = uiApp.ActiveUIDocument.Document;
            Selection sel = uiApp.ActiveUIDocument.Selection;

            Transaction ts = new Transaction(doc, "http://revit.5d6d.com");
            ts.Start();
            //选中的元素，这里选中一个管道Pipe
            Element elemPick = null;
            foreach (Element elem in sel.Elements)
            {
                elemPick = elem;
                break;
            }

            //遍历元素的普通参数
            string strParameter = "";
            foreach (Parameter p in elemPick.Parameters)
            {
                strParameter += p.Definition.ParameterGroup + "," + p.Definition.Name + "," + p.AsValueString() + "\n";
            }
            TaskDialog.Show("parameter", strParameter);
            //遍历元素的类型属性
            Pipe pipe = elemPick as Pipe;
            foreach (Parameter p in pipe.PipeType.Parameters)
            {
                if (p.Definition.Name == "材质")
                {
                    //元素的参数值可能是一个元素，比如材质的参数值是一个Material元素
                    PipeMaterialType pipeMater = doc.get_Element(p.AsElementId()) as PipeMaterialType;
                    //材质还分管道材质这里不能转化为Material
                    TaskDialog.Show("类型属性", pipeMater.Category.Name + "," + pipeMater.Name);
                }
            }
            //系统包含的材质元素
            string strMaterial = "";
            Materials materials = doc.Settings.Materials;
            foreach (Material ma in materials)
            {
                strMaterial += ma.Name + "\n";
            }
            TaskDialog.Show("Material", strMaterial);

            ts.Commit();

            return Result.Succeeded;
        }
        //元素的参数，参数组，即属性面版中可以折叠的部分，这里读Pipe
        public Parameter FindParameter(Element element)
        {
            Parameter foundParameter = null;
            int i = 0;
            foreach (Parameter parameter in element.Parameters)
            {
                //BuiltInParameterGroup.PG_MECHANICAL//机械
                //BuiltInParameterGroup.PG_CONSTRAINTS//限制条件
                //BuiltInParameterGroup.PG_GEOMETRY//尺寸标注
                //BuiltInParameterGroup.PG_PHASING//阶段化
                //BuiltInParameterGroup.PG_IDENTITY_DATA//标识数据
                //BuiltInParameterGroup.PG_INSULATION//绝缘层
                if (BuiltInParameterGroup.PG_GEOMETRY == parameter.Definition.ParameterGroup)
                {
                    TaskDialog.Show("g", parameter.Definition.Name);
                    i += 1;
                }
                Definition definition = parameter.Definition;//参数的基类
                //过滤参数
                if (definition.ParameterGroup == BuiltInParameterGroup.PG_MATERIALS &&
                        definition.ParameterType == ParameterType.Material)
                {
                    foundParameter = parameter;
                    break;
                }
            }
            TaskDialog.Show("i", i + "个");
            return foundParameter;
        }
    }

}

from:http://revit.5d6d.com/thread-1324-1-1.html