了解Revit扩展存储数据（Extensible Storage）
从Revit2012开始引入了扩展存储这个新技术，就是可以把一些数据存储到Revit中的某一个对象上。扩展数据只能通过编程的方式添加到对象上，通过Revit软件的界面无法添加。这是编程的一个大优势。你可以把任何的数据保存在Revit中的任何一个对象上。你自己的扩展数据始终跟着这个Rvt文件走，不会丢失。 而且存储的数据可以设置访问权限。对于保密数据可以只能是你自己的程序读取，或只有具有特殊的开发者代号的程序才能访问。对于数据的保密性非常有帮助。
创建共享参数步骤：
创建并命名新的数据架构（Schema）
设置数据架构（Schema）读写访问权限
向数据架构增加字段（一个或多个）
基于数据架构创建一个数据对象（Entity）
给数据对象Entity中的字段赋值
关联数据对象Entity和Revit模型中的对象
下面时段代码演示：
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public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
UIDocument uiDoc = commandData.Application.ActiveUIDocument;
Document doc = uiDoc.Document;
// Create transaction for working with schema
Transaction trans = new Transaction(doc, "Extensible Storage");
trans.Start();
// Select a wall element
Wall wall = null;
try
{
Reference r = uiDoc.Selection.PickObject(ObjectType.Element,
new WallSelectionFilter());
wall = doc.GetElement(r) as Wall;
}
catch (Autodesk.Revit.Exceptions.OperationCanceledException)
{
message = "Nothing selected; please select a wall to attach extensible data to.";
return Result.Failed;
}
Debug.Assert(null != wall, "expected a wall to be selected");
if (null == wall)
{
message = "Please select a wall to attach extensible data to.";
return Result.Failed;
}
// Create a schema builder
SchemaBuilder builder = new SchemaBuilder(_guid);
// Set read and write access levels
builder.SetReadAccessLevel(AccessLevel.Public);
builder.SetWriteAccessLevel(AccessLevel.Public);
// Note: if this was set as vendor or application access,
// we would have been additionally required to use SetVendorId
// Set name to this schema builder
builder.SetSchemaName("WallSocketLocation");
builder.SetDocumentation("Data store for socket related info in a wall");
// Create field1
FieldBuilder fieldBuilder1 =
builder.AddSimpleField("SocketLocation", typeof(XYZ));
// Set unit type
fieldBuilder1.SetUnitType(UnitType.UT_Length);
// Add documentation (optional)
// Create field2
FieldBuilder fieldBuilder2 =
builder.AddSimpleField("SocketNumber", typeof(string));
//fieldBuilder2.SetUnitType(UnitType.UT_Custom);
// Register the schema object
Schema schema = builder.Finish();
// Create an entity (object) for this schema (class)
Entity ent = new Entity(schema);
Field socketLocation = schema.GetField("SocketLocation");
ent.Set<XYZ>(socketLocation, new XYZ(2, 0, 0), DisplayUnitType.DUT_METERS);
Field socketNumber = schema.GetField("SocketNumber");
ent.Set<string>(socketNumber, "200");
wall.SetEntity(ent);
// Now create another entity (object) for this schema (class)
Entity ent2 = new Entity(schema);
Field socketNumber1 = schema.GetField("SocketNumber");
ent2.Set<String>(socketNumber1, "400");
wall.SetEntity(ent2);
// Note: this will replace the previous entity on the wall
// List all schemas in the document
string s = string.Empty;
IList<Schema> schemas = Schema.ListSchemas();
foreach (Schema sch in schemas)
{
s += "\r\nSchema Name: " + sch.SchemaName;
}
TaskDialog.Show("Schema details", s);
// List all Fields for our schema
s = string.Empty;
Schema ourSchema = Schema.Lookup(_guid);
IList<Field> fields = ourSchema.ListFields();
foreach (Field fld in fields)
{
s += "\r\nField Name: " + fld.FieldName;
}
TaskDialog.Show("Field details", s);
// Extract the value for the field we created
Entity wallSchemaEnt = wall.GetEntity(Schema.Lookup(_guid));
XYZ wallSocketPos = wallSchemaEnt.Get<XYZ>(
Schema.Lookup(_guid).GetField("SocketLocation"),
DisplayUnitType.DUT_METERS);
s = "SocketLocation: " + Format.PointString(wallSocketPos);
string wallSocketNumber = wallSchemaEnt.Get<String>(
Schema.Lookup(_guid).GetField("SocketNumber"));
s += "\r\nSocketNumber: " + wallSocketNumber;
TaskDialog.Show("Field values", s);
trans.Commit();
return Result.Succeeded;
}
转载请复制以下信息：原文链接： http://blog.csdn.net/joexiongjin/article/details/7776552作者：叶雄进 , Autodesk ADN
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