How do I back up the observable collection used by a WPF datagrid?

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I would like to back up the observable collection used by a WPF datagrid for the purposes of a rollback/undo button to the point of the last commit. I have a refresh option that will read from the database but that will include changes from other sources.

What I have tried:

I have tried copying the observable collection to a list, but any changes made to the OC are also persisted to that list. But aside from a single simple assignment statement that list is not in any other way connected to the observable collection.
Its almost as if the address of the observable collection was assigned to be the address of the backup list in the manner of how it is behaving. How do I overcome this?

Posted 29-Jul-20 0:38am

Ger Hayden

Updated 29-Jul-20 8:20am

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Garth J Lancaster 29-Jul-20 8:49am

I keep thinking 'deep copy' / clone but I'm not sure if it is as simple as backup = ObservableCollection.Clone()

Ger Hayden 29-Jul-20 9:16am

I will explore that thought, it might well be the solution.

[no name] 29-Jul-20 13:56pm

You have to deep-clone every object from the source to target to maintain the source in it's original condition. There is no general "clone collection" method.

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RickZeeland · Accepted Answer · 2020-07-29T08:20:00

Solution 1

Maybe you can use serializing, see this CodeProject article: Implementing Deep Cloning via Serializing objects[^]
As this is not a WPF article, you probably need to modify the code.

Posted 29-Jul-20 8:20am

RickZeeland

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Ger Hayden 31-Jul-20 3:17am

So far I have implemented both the example in Rick's solution and the deep clone from https://stackoverflow.com/questions/129389/how-do-you-do-a-deep-copy-of-an-object-in-net. Both are popping out when the memory stream statement is first run. I havent done any checking as to why yet.

How do I back up the observable collection used by a WPF datagrid?

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How do I back up the observable collection used by a WPF datagrid?

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