Computing an Original Value Graph

EF Extension Methods Extravaganza Part III – Fun with LINQ to Objects

system.data.objects dev guy — Fri, 18 Jan 2008 00:36:31 GMT

In this previous post and its follow-on I shared a series of extension methods that I’ve been using to

re: Computing an Original Value Graph

datdb — Thu, 04 Sep 2008 13:05:15 GMT

hi Danny,

Your code is very useful for me but the method SetRelationships sometime cause stack overflow. How can I fix it ?

thanks

re: Computing an Original Value Graph

dsimmons@microsoft.com — Sun, 07 Sep 2008 22:05:04 GMT

Sorry for not responding sooner. Sounds like there's an issue with the recursion, but I'm not sure just what it is. If you can produce something that will repro the problem regularly and share it with me, that would be a huge help.

If not, I'll try to get the time to look at this generally and see what I can find out, but I'm not sure exactly when that will happen.

- Danny

re: Computing an Original Value Graph

datdb — Tue, 23 Sep 2008 06:49:01 GMT

thanks for your good intention, the idea behind the method CreateOriginalValuesGraph is very good, but in practice we do not always want to get an entity with full graph. This mean, in some cases, we need to get entity's original value that including some relations, not all of relations (I've just imagine it like ObjectQuery.Include() method).

So can you suggest idea to implement the method like this ?

Dat

re: Computing an Original Value Graph

dsimmons@microsoft.com — Tue, 23 Sep 2008 07:55:01 GMT

The truth is that I just don't have the time to sit down and write this at the moment, but I don't think it would be that hard. You would just need to consider whether or not a relationship type is one you want to recurse into or skip before making the recursive call at the bottom of SetRelationships. The complexity would mostly come in the form of parsing the include statements and maintaining a stack showing what navigations you have done in order to compare with the include.

- Danny