Topic: I want read a dwg File from fileStream,How can I do.

[xys1995]

a dwg file in network,I want to read it from a client PC using WCF.how can I do.

[n.yuan]

You probably want to open a file stream and then read the stream into a byte[] chunk by chunk.

Look into

System.IO.File.Read()
System.IO.Stream.Read()

Googling File.Read()/Stream.Read() brings tons of links.

[xys1995]

Yes,I can read the file,but the Database.readFile(string),I want get the Database Entity as Steam.

[MexicanCustard]

Can you save the stream as a temporary file (Path.TemporaryFileName) and then Database.ReadDwg the temp file?

I don't think AutoCAD is capable of what I think you want to do.  Since a dwg is nothing more than a database and AutCAD needs mutliple pieces of the database just to load the visual representation.  So I would think you would need the entire file available to AutoCAD in order to load/ open it. Unlike streaming media which can be read sequentially.