c# autocad旁载数据库绑定xref

本文关键字：绑定 xref 数据库 autocad | 更新日期: 2023-09-27 18:12:01

我正在尝试绑定xref在一个侧负载绘图数据库。程序在这行' if(!xNode.Database.Filename.Equals(NewDb.Filename))'处停止。我也收到这个错误的系统。NullReferenceException:对象引用没有设置为对象的实例。在XBind.RecursiveFileProcessor。ProcessFile (String路径)。"我做了一些研究，发现了VB。. NET代码附加一个xref，并尝试推断，但没有成功。我希望有人能给我指出正确的方向。

                using (Database NewDb = new Database(false, true))
            {
                NewDb.ReadDwgFile(path, FileOpenMode.OpenForReadAndWriteNoShare, true, "");
                NewDb.CloseInput(true);
                using (Transaction tr = NewDb.TransactionManager.StartTransaction())
                {
                    ObjectIdCollection xrefCollection = new ObjectIdCollection();
                    XrefGraph xg = NewDb.GetHostDwgXrefGraph(false);
                    int numOfNodes = xg.NumNodes;
                    for (int cnt = 0; cnt < xg.NumNodes; cnt++)
                    {
                        XrefGraphNode xNode = xg.GetXrefNode(cnt) as XrefGraphNode;
                        if (!xNode.Database.Filename.Equals(NewDb.Filename))
                        {
                            if (xNode.XrefStatus == XrefStatus.Resolved)
                            {
                                xrefCollection.Add(xNode.BlockTableRecordId);
                            }
                        }
                    }
                    if (xrefCollection.Count != 0)
                    {
                        NewDb.BindXrefs(xrefCollection, true);
                    }
                    tr.Commit();
                }
                NewDb.SaveAs(path, DwgVersion.Current);
            }

c# autocad旁载数据库绑定xref

实际上，这将在内存中工作。Winslow North缺少CloseInput()之后的一行代码…

NewDb.ResolveXrefs(true, false);

但是，您也不需要为此使用Transaction。没有必要。我制作了自己的样本并进行了测试。它的工作原理。如果你需要我发布，请告诉我。问题是，由于没有解析Xref, xNode有一个空数据库。您必须手动完成上面的行。

不相信这将在内存数据库工作，你可以尝试这种方法，看看下面的一部分:

[CommandMethod("CHX")]
public void ChangeXref()
{
  var doc = Application.DocumentManager.MdiActiveDocument;
  if (doc == null) return;
  var ed = doc.Editor;
  var db = doc.Database;
  // Get the database associated with each xref in the
  // drawing and change all of its circles to be dashed
  using (var tr = db.TransactionManager.StartTransaction())
  {
    var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
    var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead);
    // Loop through the contents of the modelspace
    foreach (var id in ms)
    {
      // We only care about BlockReferences
      var br = tr.GetObject(id, OpenMode.ForRead) as BlockReference;
      if (br != null)
      {
        // Check whether the associated BlockTableRecord is
        // an external reference
        var bd = (BlockTableRecord)tr.GetObject(br.BlockTableRecord, OpenMode.ForRead);
        if (bd.IsFromExternalReference)
        {
          // If so, get its Database and call the function
          // to change the linetype of its Circles
          var xdb = bd.GetXrefDatabase(false);
          if (xdb != null)
          {
            using (var xf = XrefFileLock.LockFile(xdb.XrefBlockId))
            {
              // Make sure the original symbols are loaded
              xdb.RestoreOriginalXrefSymbols();
              xdb.RestoreForwardingXrefSymbols();
            }
          }
        }
      }
    }
    tr.Commit();
  }
}
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