オブジェクトを削除する(.NET)

非グラフィカル オブジェクトおよびグラフィカル オブジェクトを、Erase メソッドで削除できます。

注意: 画層テーブルやモデル空間ブロック テーブル レコードなどの多くの非グラフィカル オブジェクトには Erase メソッドがありますが、このメソッドは呼び出さないようにする必要があります。このようなオブジェクトで Erase を呼び出した場合、エラーが発生します。

ポリラインを作成し、削除する

次の例は、ライトウェイト ポリラインを作成し、次にそれを削除します。

VB.NET

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
 
<CommandMethod("EraseObject")> _
Public Sub EraseObject()
    '' 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 Block table for read
        Dim acBlkTbl As BlockTable
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead)

        '' Open the Block table record Model space for write
        Dim acBlkTblRec As BlockTableRecord
        acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _
                                        OpenMode.ForWrite)

        '' Create a lightweight polyline
        Using acPoly As Polyline = New Polyline()
            acPoly.AddVertexAt(0, New Point2d(2, 4), 0, 0, 0)
            acPoly.AddVertexAt(1, New Point2d(4, 2), 0, 0, 0)
            acPoly.AddVertexAt(2, New Point2d(6, 4), 0, 0, 0)

            '' Add the new object to the block table record and the transaction
            acBlkTblRec.AppendEntity(acPoly)
            acTrans.AddNewlyCreatedDBObject(acPoly, True)

            '' Update the display and display an alert message
            acDoc.Editor.Regen()
            Application.ShowAlertDialog("Erase the newly added polyline.")

            '' Erase the polyline from the drawing
            acPoly.Erase(True)
        End Using

        '' Save the new object to the database
        acTrans.Commit()
    End Using
End Sub

C#

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
 
[CommandMethod("EraseObject")]
public static void EraseObject()
{
    // 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 Block table for read
        BlockTable acBlkTbl;
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                        OpenMode.ForRead) as BlockTable;

        // Open the Block table record Model space for write
        BlockTableRecord acBlkTblRec;
        acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                        OpenMode.ForWrite) as BlockTableRecord;

        // Create a lightweight polyline
        using (Polyline acPoly = new Polyline())
        {
            acPoly.AddVertexAt(0, new Point2d(2, 4), 0, 0, 0);
            acPoly.AddVertexAt(1, new Point2d(4, 2), 0, 0, 0);
            acPoly.AddVertexAt(2, new Point2d(6, 4), 0, 0, 0);

            // Add the new object to the block table record and the transaction
            acBlkTblRec.AppendEntity(acPoly);
            acTrans.AddNewlyCreatedDBObject(acPoly, true);

            // Update the display and display an alert message
            acDoc.Editor.Regen();
            Application.ShowAlertDialog("Erase the newly added polyline.");

            // Erase the polyline from the drawing
            acPoly.Erase(true);
        }

        // Save the new object to the database
        acTrans.Commit();
    }
}

VBA/ActiveX コード リファレンス

Sub EraseObject()
    ' Create the polyline
    Dim lwpolyObj As AcadLWPolyline
    Dim vertices(0 To 5) As Double
    vertices(0) = 2: vertices(1) = 4
    vertices(2) = 4: vertices(3) = 2
    vertices(4) = 6: vertices(5) = 4
    Set lwpolyObj = ThisDrawing.ModelSpace. _
                                     AddLightWeightPolyline(vertices)
    ZoomAll
    ' Erase the polyline
    lwpolyObj.Delete
    ThisDrawing.Regen acActiveViewport
End Sub