擦除图层 （.NET）
您可以在绘图会话期间随时拭除图层。无法拭除当前图层、图层 0、与外部参照相关的图层或包含对象的图层。 要擦除图层，请使用该方法。建议使用 Purge 函数来验证该图层是否可以被清除，同时验证它不是图层 0、Defpoints 或当前图层。Erase
注意：块定义引用的图层以及名为 DEFPOINTS 的特殊图层即使不包含可见对象，也无法删除。
VB.NETImports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
<CommandMethod("EraseLayer")> _
Public Sub EraseLayer()
'' Get the current document and database
Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
Dim acCurDb As Database = acDoc.Database
'' Start a transaction
Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
'' Open the Layer table for read
Dim acLyrTbl As LayerTable
acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId, _
OpenMode.ForRead)
Dim sLayerName As String = "ABC"
If acLyrTbl.Has(sLayerName) = True Then
'' Check to see if it is safe to erase layer
Dim acObjIdColl As ObjectIdCollection = New ObjectIdCollection()
acObjIdColl.Add(acLyrTbl(sLayerName))
acCurDb.Purge(acObjIdColl)
If acObjIdColl.Count > 0 Then
Dim acLyrTblRec As LayerTableRecord
acLyrTblRec = acTrans.GetObject(acObjIdColl(0), OpenMode.ForWrite)
Try
'' Erase the unreferenced layer
acLyrTblRec.Erase(True)
'' Save the changes and dispose of the transaction
acTrans.Commit()
Catch Ex As Autodesk.AutoCAD.Runtime.Exception
'' Layer could not be deleted
Application.ShowAlertDialog("Error:\n" + Ex.Message)
End Try
End If
End If
End Using
End Sub
C#using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
[CommandMethod("EraseLayer")]
public static void EraseLayer()
{
// Get the current document and database
Document acDoc = Application.DocumentManager.MdiActiveDocument;
Database acCurDb = acDoc.Database;
// Start a transaction
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
// Open the Layer table for read
LayerTable acLyrTbl;
acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
OpenMode.ForRead) as LayerTable;
string sLayerName = "ABC";
if (acLyrTbl.Has(sLayerName) == true)
{
// Check to see if it is safe to erase layer
ObjectIdCollection acObjIdColl = new ObjectIdCollection();
acObjIdColl.Add(acLyrTbl[sLayerName]);
acCurDb.Purge(acObjIdColl);
if (acObjIdColl.Count > 0)
{
LayerTableRecord acLyrTblRec;
acLyrTblRec = acTrans.GetObject(acObjIdColl[0],
OpenMode.ForWrite) as LayerTableRecord;
try
{
// Erase the unreferenced layer
acLyrTblRec.Erase(true);
// Save the changes and dispose of the transaction
acTrans.Commit();
}
catch (Autodesk.AutoCAD.Runtime.Exception Ex)
{
// Layer could not be deleted
Application.ShowAlertDialog("Error:\n" + Ex.Message);
}
}
}
}
}
VBA/ActiveX 代码参考Sub EraseLayer()
On Error Resume Next
Dim layerObj As AcadLayer
Set layerObj = ThisDrawing.Layers("ABC")
layerObj.Delete
End Sub
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