mongo C# V2: When and how much of an document is loaded/deserialized especially nested documents

Asked Apr 24 '16 at 16:27

Active Apr 24 '16 at 16:27

Viewed 25 times

While investigate an Exception caused while doing a FindAsync operation Exception caused while doing a FindAsync operation

It looks like during the FindAsync the found Objects are deserialized. Which does mean, that the whole documents are loaded into memory.

But if I only want to access one entry of a nested list of subdocuments this doesn't make sense if the embedded list is large. Is there away to prevent loading of the whole document?

Does it make a difference how the loading is done if I use BSONDocument or a strongly typed collection?

The same goes for adding new embedded entries to the document (e.g. time stamps). Will for adding/updating always the whole document be loaded?

edited May 23 '17 at 12:31

Community

asked Apr 24 '16 at 16:27

Thomas

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Unless you specify otherwise.. the whole object is retrieved. It doesn't matter whether it's typed or `BsonDocument`. – i3arnon Apr 24 '16 at 16:35
How can I change this behaviour? – Thomas Apr 24 '16 at 16:37
Depends on how you query. But you can use `Project` to select only part of the document. – i3arnon Apr 24 '16 at 16:38
Ah, so Project is handled on the server side? I will have to have a closer look on Projection. I didn't realize to use them in this context. – Thomas Apr 24 '16 at 16:42
But what about Updates and adding Data? – Thomas Apr 24 '16 at 17:39

mongo C# V2: When and how much of an document is loaded/deserialized especially nested documents

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