使用ProjectInfo保存文件级别的额外信息

为了保存文件级别的额外信息，可以将共享数据添加到ProjectInfo对象中。
ProjectInfo在一个Document中只有一个对象。ProjectInfo的BuildInCategory 成员是OST_ProjectInformation.

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 RevitApp = Autodesk.Revit.ApplicationServices;

using System.Data;
using System.Data.SQLite;
using System.Data.Common;
using System.Xml;
using Autodesk.Revit.DB.Analysis;
using Autodesk.Revit.DB.ExtensibleStorage;

namespace RevitCodes
{
    [Transaction(TransactionMode.Manual)]
    [Regeneration(RegenerationOption.Manual)]
    //[Journaling(JournalingMode.NoCommandData)]
    public class cmdInfo : IExternalCommand
    {
        public Result Execute(ExternalCommandData cmdData, ref string msg, ElementSet elements)
        {
            UIDocument uiDoc = cmdData.Application.ActiveUIDocument;
            Selection selection = uiDoc.Selection;
            Document document = uiDoc.Document;


            XYZ xyzTmp = new XYZ(10, 20, 30);

            Transaction ts = new Transaction(uiDoc.Document, "ts");
            ts.Start();
            /*
            */
            SchemaBuilder schemaBuilder = new SchemaBuilder(System.Guid.NewGuid());

            // allow anyone to read the object 读取权限
            schemaBuilder.SetReadAccessLevel(AccessLevel.Public);

            // restrict writing to this vendor only 写入权限
            schemaBuilder.SetWriteAccessLevel(AccessLevel.Vendor);

            // required because of restricted write-access 
            schemaBuilder.SetVendorId("ADSK");

            // create a field to store an XYZ 创建一个字段
            FieldBuilder fieldBuilder = schemaBuilder.AddSimpleField("WireSpliceLocation", typeof(XYZ));

            fieldBuilder.SetUnitType(UnitType.UT_Length);

            fieldBuilder.SetDocumentation("A stored location value representing a wiring splice in a wall.");

            schemaBuilder.SetSchemaName("WireSpliceLocation");

            Schema schema = schemaBuilder.Finish(); // register the Schema object 

            // create an entity (object) for this schema (class) 

            Entity entity = new Entity(schema);

            // get the field from the schema 

            Field fieldSpliceLocation = schema.GetField("WireSpliceLocation");

            entity.Set<XYZ>(fieldSpliceLocation, xyzTmp, DisplayUnitType.DUT_METERS); // set the value for this entity 

            document.ProjectInformation.SetEntity(entity);


            //Schema schema = null;
            Entity retrievedEntity = document.ProjectInformation.GetEntity(schema);

            XYZ retrievedData = retrievedEntity.Get<XYZ>(schema.GetField("WireSpliceLocation"), DisplayUnitType.DUT_METERS);

            TaskDialog.Show("xyz", retrievedData.X + "," + retrievedData.Y + "," + retrievedData.Z);

            ts.Commit();
            return Result.Succeeded;
        }
    }
}

from:http://revit.5d6d.com/thread-1218-1-1.html