How would I convert a relational dataset to a nested ObservableCollection?

Question

0.00/5 (No votes)

See more:

I'm stuck at the moment. I have a dataset with 2 related tables. It's a simple parent table with a single related child table.

For various reasons, I need to convert the dataset into a nested ObservableCollection. The following Linq code works with 1 issue: I'm missing a where clause on the nested collection so all of the children are part of the parent which is incorrect.

C#

this.ocApps = new ObservableCollection<Models.ApplicationTypesModel>(this.dsApps.tAppTypes.AsEnumerable().Select(apptype => new Models.ApplicationTypesModel
                {
                    AppType = apptype.nvarAppType,
                    Apps=new ObservableCollection<Models.ApplicationModel>(this.dsApps.tApps.AsEnumerable().Select(apps=>new Models.ApplicationModel
                    {
                        idAppId=apps.idAppId,
                        strAppName=apps.nvarAppName,
                        strEnvironment=apps.nvarEnvironment,
                        strAppType=apps.nvarAppType,
                        dtLastPrivACCertDate= apps.dtLastPrivACCertDt
                    }).where(the parent table.apptype value = the child table.apptype value))
                }));

I think I need a where on the inner select, which makes sense...but I'm not sure where or how to put the where.

Does anyone have some suggestions?

Thanks

Posted 12-Dec-12 1:25am

Server Automator

Updated 12-Dec-12 23:38pm

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Server Automator · Accepted Answer · 2012-12-12T23:32:00

This works perfectly. The syntax of the "where" is what I was missing. The following URL may be of help to someone else who needs to convert a relational dataset to a nested ObservableCollection. My intent is in the ViewModel of a MVVM pattern with this particular app.

http://stackoverflow.com/questions/6359980/proper-linq-where-clauses

The format of "}).Where(app=>app.strAppType==apptype.nvarAppType)" is what was throwing me.

XML

this.ocApps = new System.Collections.ObjectModel.ObservableCollection<Models.ApplicationTypesModel>(this.dsApps.tAppTypes.AsEnumerable().Select(apptype => new Models.ApplicationTypesModel
                {
                    AppType = apptype.nvarAppType,
                    Apps = new System.Collections.ObjectModel.ObservableCollection<Models.ApplicationModel>(this.dsApps.tApps.AsEnumerable().Select(apps => new Models.ApplicationModel
                    {
                        idAppId = apps.idAppId,
                        strAppName = apps.nvarAppName,
                        strEnvironment = apps.nvarEnvironment,
                        strAppType = apps.nvarAppType,
                        dtLastPrivACCertDate = apps.dtLastPrivACCertDt
                    }).Where(app=>app.strAppType==apptype.nvarAppType))
                }));