How to understand the difference in expression methods for obtaining paper space record objects

[kelidesign]

var blockModelSpace = ((BlockTable)db.BlockTableId.GetObject(mode))[BlockTableRecord.ModelSpace];
var blockPaperSpace = (BlockTableRecord)SymbolUtilityServices.GetBlockPaperSpaceId(db).GetObject(mode);

[kelidesign]

It should be obtained directly by default instead of using Table, which can reduce the complexity of the problem.

[kelidesign]

It seems that a specific record is obtained through this special method. Not all, there should be multiple papers.

>(1794009289200) *Model_Space
>(1794009289344) *Paper_Space
>(1794009289424) *Paper_Space0

[_gile · Accepted solution]

Hi,

As for ModelSpace, both expressions:

SymbolUtilityServices.GetBlockPaperSpaceId(db)

and

blockTable[BlockTableRecord.PaperSpace]

return the same value, i.e. the ObjectId of the blockTableRecord of the last opened paper space layout (or the first one if none have been opened in the session).

The main difference is the first one does not need to get an instance of the BlockTable (i.e. it can be used outside of a Transaction).

[kelidesign · Accepted solution]

Yes, what you said makes sense. Affairs is the most important factor.