重新加载外部参照 （.NET）

如果有人在处理附着了该外部参照的主机绘图时修改了外部参照绘图，则可以使用该方法更新该外部参照绘图。重新加载时，选定的外部参照图形将在宿主图形中更新。此外，如果已卸载外部参照，则可以随时选择重新加载该外部参照绘图。Reload

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

<CommandMethod("ReloadingExternalReference")> _
Public Sub ReloadingExternalReference()
    ' 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.ReloadXrefs(acXrefIdCol)
            End Using

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

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

        ' Dispose of the transaction
    End Using
End Sub

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

[CommandMethod("ReloadingExternalReference")]
public void ReloadingExternalReference()
{
    // 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.ReloadXrefs(acXrefIdCol);
            }

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

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

        // Dispose of the transaction
    }
}

Sub ReloadingExternalReference()
    ' 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 to the block
    Set xrefInserted = ThisDrawing.ActiveLayout.Block. _
        AttachExternalReference(PathName, "Exterior Elevations", insertionPnt, 1, 1, 1, 0, False)

    MsgBox "The external reference is attached."
 
    ' Reload the external reference definition
    ThisDrawing.Blocks.Item(xrefInserted.name).Reload
    MsgBox "The external reference is reloaded."
End Sub