Common Language Runtime detected an invalid program.

[Anonymous]

I got error when I read file dwg using C#:

My code :

Database db = new Database(false, true)

db.ReadDwgFile(filename, FileOpenMode.OpenForReadAndAllShare, false, null);

Error:

An unhandled exception of type 'System.InvalidProgramException' occurred in ReadCADFile.exe

Additional information: Common Language Runtime detected an invalid program.

How to resolve this problem ?

[Alexander.Rivilis]

@Anonymous

1. Wrong forum selected for this question. Right forum is https://forums.autodesk.com/t5/net/bd-p/152

2. You can not use AutoCAD .NET API with external exe-application. It can be used only in inproc dll addin, which loaded in AutoCAD with NETLOAD command.

[Anonymous]

Dear Alexander.Rivilis,

Thanks for your reply

You mean : I' LL build DLL then add them to AutoCad and use NetLoad Command to call them ?

[Alexander.Rivilis]

NETLOAD command is using not for call dll, but for load it into AutoCAD.

[Anonymous]

Hi,

Why then, in documentation for 2021, said that it can be used in .net standalone app?

https://help.autodesk.com/view/OARX/2021/ENU/?guid=GUID-71554E76-8FD5-4853-82CD-3587764CBCAC

Either documentation is wrong, or is incomplete - missing instructions how to do it.

Btw, I have similar problem, trying to read .cuix file (to customize UI) from standalone .net app.

[artc2 · Accepted solution]

Using the .NET API in a standalone program requires the RealDWG SDK which is a licensed product and not free.