Can not open BlockTableRecord as OpenMode.ForWrite

[nghiabt04]

Hi,

Currently, I write a program open WPF UserControl as ToolPalette. When I tried to GetObject BlockTableRecord as OpenMode.ForWrite by a button but AutoCAD always turns to be FATAL ERROR shutdown anyway. 

When I test this code again in command mode, the code works fine. Anyone have an idea about this situation, please help me.

Thanks a lot!

[SENL1362 · Accepted solution]

did you lock the document?

try

{

using (var docLck = doc.LockDocument())
{

var db=doc.Database;

using (var tr=db.TransactionManager.StartTransaction())

{

var blk = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForWrite);

...

[_gile · Accepted solution]

Hi,

From Kean Walmsley's blog:

"there’s our important rule of thumb when it comes to implementing a modeless UI: rather than manually locking the current document, it’s safer to define a command – which will implicitly lock the current document – and call that from the UI via SendStringToExecute()."

[nghiabt04]

Yes, I forgot to lock the document, thanks for your help