内存中进行批处理文件
问题：Batch process in-memory
解答：
When we try batch process files in memory, we must take special attention to which transaction is in use, but the real trick is how to save the file: AutoCAD will lock the file in use and therefore the SaveAs method is not available for the current file, so the trick could be save as a temporary file and then replace it. This approach can be used to batch process and is faster then open drawings “on scree” (visible). The trade-off is that some features may not be available, such as Layout Manager.
Public Sub batchProcess()
' get all DWG files from a specific folder
Dim directory As New System.IO.DirectoryInfo("C:\temp")
Dim files As System.IO.FileInfo() = _
directory.GetFiles("*.dwg")
For Each file As System.IO.FileInfo In files
' generate a temp file location
Dim tempFileName As String = _
System.IO.Path.GetTempFileName()
Using db As New Database(False, True)
' open the current file
db.ReadDwgFile(file.FullName, _
System.IO.FileShare.ReadWrite, _
True, String.Empty)
Using trans As Transaction = _
db.TransactionManager.StartTransaction()
' ToDo:
' Do your processing here
' commit changes
trans.Commit()
End Using
' save as temp file
db.SaveAs(tempFileName, DwgVersion.Current)
End Using ' dispose the database
' now replace
System.IO.File.Copy(tempFileName, file.FullName, True)
' and erase the temp file
System.IO.File.Delete(tempFileName)
Next
End Sub
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