外部参照をロード解除する(.NET)

外部参照をロード解除するには、Unload メソッドを使用します。現在の図面で使用されていない参照ファイルをロード解除すると、不必要な図面ジオメトリまたはシンボル テーブル情報を読み込み表示する必要がないので、AutoCAD のパフォーマンスが改善されます。外部参照ジオメトリおよびネストした外部参照は、外部参照が再ロードされるまで現在の図面には表示されません。

外部参照定義をロード解除する

次の例では、外部参照をアタッチしてから、ロード解除します。この例では、Sample フォルダにある Exterior Elevations.dwg ファイルを使用します。このイメージが存在しない場合や、別のフォルダにある場合は、有効なパスおよびファイル名を指定してください。

VB.NET

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry

<CommandMethod("UnloadingExternalReference")> _
Public Sub UnloadingExternalReference()
    ' Get the current database and start a transaction
    Dim acCurDb As Autodesk.AutoCAD.DatabaseServices.Database
    acCurDb = Application.DocumentManager.MdiActiveDocument.Database

    Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
        ' Create a reference to a DWG file
        Dim PathName As String = "C:\AutoCAD\Sample\Sheet Sets\Architectural\Res\Exterior Elevations.dwg"
        Dim acXrefId As ObjectId = acCurDb.AttachXref(PathName, "Exterior Elevations")

        ' If a valid reference is created then continue
        If Not acXrefId.IsNull Then
            ' Attach the DWG reference to the current space
            Dim insPt As New Point3d(1, 1, 0)
            Using acBlkRef As New BlockReference(insPt, acXrefId)

                Dim acBlkTblRec As BlockTableRecord
                acBlkTblRec = acTrans.GetObject(acCurDb.CurrentSpaceId, OpenMode.ForWrite)

                acBlkTblRec.AppendEntity(acBlkRef)
                acTrans.AddNewlyCreatedDBObject(acBlkRef, True)
            End Using

            MsgBox("The external reference is attached.")

            Using acXrefIdCol As New ObjectIdCollection
                acXrefIdCol.Add(acXrefId)

                acCurDb.UnloadXrefs(acXrefIdCol)
            End Using

            MsgBox("The external reference is unloaded.")
        End If

        ' Save the new objects to the database
        acTrans.Commit()

        ' Dispose of the transaction
    End Using
End Sub

C#

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;

[CommandMethod("UnloadingExternalReference")]
public void UnloadingExternalReference()
{
    // Get the current database and start a transaction
    Database acCurDb;
    acCurDb = Application.DocumentManager.MdiActiveDocument.Database;

    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Create a reference to a DWG file
        string PathName = "C:\\AutoCAD\\Sample\\Sheet Sets\\Architectural\\Res\\Exterior Elevations.dwg";
        ObjectId acXrefId = acCurDb.AttachXref(PathName, "Exterior Elevations");

        // If a valid reference is created then continue
        if (!acXrefId.IsNull)
        {
            // Attach the DWG reference to the current space
            Point3d insPt = new Point3d(1, 1, 0);
            using (BlockReference acBlkRef = new BlockReference(insPt, acXrefId))
            {
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acCurDb.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;

                acBlkTblRec.AppendEntity(acBlkRef);
                acTrans.AddNewlyCreatedDBObject(acBlkRef, true);
            }

            Application.ShowAlertDialog("The external reference is attached.");

            using (ObjectIdCollection acXrefIdCol = new ObjectIdCollection())
            {
                acXrefIdCol.Add(acXrefId);

                acCurDb.UnloadXrefs(acXrefIdCol);
            }

            Application.ShowAlertDialog("The external reference is unloaded.");
        }

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

        // Dispose of the transaction
    }
}

VBA/ActiveX コード リファレンス

Sub UnloadingExternalReference()
    ' Define external reference to be inserted
    Dim xrefInserted As AcadExternalReference
    Dim insertionPnt(0 To 2) As Double
    Dim PathName As String
    insertionPnt(0) = 1
    insertionPnt(1) = 1
    insertionPnt(2) = 0
    PathName = "C:\AutoCAD\Sample\Sheet Sets\Architectural\Res\Exterior Elevations.dwg"
 
    ' Add the external reference
    Set xrefInserted = ThisDrawing.ActiveLayout.Block. _
        AttachExternalReference(PathName, "Exterior Elevations", insertionPnt, 1, 1, 1, 0, False)
    MsgBox "The external reference is attached."
 
    ' Unload the external reference definition
    ThisDrawing.Blocks.Item(xrefInserted.name).Unload
    MsgBox "The external reference is unloaded."
End Sub