访问集合 （.NET）

大多数集合和容器对象都是通过 or 对象访问的。和 对象包含一个属性，用于访问大多数可用 Collection 对象的对象或对象 ID。例如，下面的代码定义一个变量并检索表示当前图形中集合的对象：DocumentDatabaseDocumentDatabaseLayersTableLayers

VB.NET

'' Get the current document and start the Transaction Manager
Dim acCurDb As Database = Application.DocumentManager.MdiActiveDocument.Database
Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
 
    '' This example returns the layer table for the current database
    Dim acLyrTbl As LayerTable
    acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId, _
                                 OpenMode.ForRead)
 
    '' Dispose of the transaction
End Using

C#

// Get the current document and start the Transaction Manager
Database acCurDb = Application.DocumentManager.MdiActiveDocument.Database;
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
    // This example returns the layer table for the current database
    LayerTable acLyrTbl;
    acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
                                 OpenMode.ForRead) as LayerTable;
 
     // Dispose of the transaction
}

VBA/ActiveX 代码参考

Dim layerCollection as AcadLayers
Set layerCollection = ThisDrawing.Layers