Hierarachical Related Binding : Hi quest202;The CheckBox IsChecked...

Fri, 21 Jan 2011 12:54:27 -700

Author: DenisK
Subject: 2456
Posted: 21-Jan-2011 at 12:54pm

Hi quest202;

The CheckBox IsChecked property is a boolean and as such it needs to be binded to a boolean property as well.

To get the Report's related entities of the Mapping records, you can do a logic similar to the following:

//Note that this works because you have .Include("Mappings") in your query. This line will throw an exception if you //haven't.

var mappings = Reports[0].Mappings;

Then you can do some business logic with the mappings and assign a public boolean property that will be binded to the CheckBox IsChecked property. For example:

View:

ViewModel:

public bool IsChecked {

get {

return _isChecked;

}

set {

_isChecked = value;

RaisePropertyChanged("IsChecked");

}

private bool _isChecked;

private void DoSomeLogicWithMappings(object[] mappings) {

..............

_isChecked = true;

................

}

Your implementation can be very much different from this. I'm just illustrating how to get the related entities and how to bind to the CheckBox IsChecked property.

Hope this helps.

Hierarachical Related Binding : I have an Incident Report data...

Thu, 20 Jan 2011 17:57:32 -700

Author: quest202
Subject: 2456
Posted: 20-Jan-2011 at 5:57pm

I have an Incident Report data form which also lists all possible threat types for user to choose for this Incident Report. The threat types are in Threat table which is hierarchical categorized with parent-child relationship.

So I have 3 tables.

The Incident Report table consists of fields: ReportID (primary,unique), Title, Story….

The Threat table consists of fields: ThreatID (primary,unique), ParentThreatID, Name ….

The third table tied the above 2 tables together. I called it the Mapping table. The Mapping table consists of fields: MappingID (primary,unique), ReportID, and ThreatID. The purpose of the Mapping table is to keep track of the threat types assigned to a report.

In my ViewModel, I have the following in the constructor:

Reports = new ObservableCollection<Report>();

var query = _mgr.Reports.Include("Mappings");

query.ExecuteAsync(op => op.Results.ForEach(this.Reports.Add));

I am able to display the Incident Report DataForm and all possible Threat types from the Threat table in a tree view (HierachicalDataTemplate), and I put checkboxes in front of the tree item. My problem is now I need to check the box of the appropriate Threat if the ReportID existed in the Mapping table. Furthermore, if the ReportID for the Threat does not exist in the Mapping table, I need to add a new record to the Mapping table to keep track of it.

I am not sure how to get to the Report’s related entities of the Mapping records, and assigned them to the checkboxes.

Thank you for your help

DevForce Community Forum : Hierarachical Related Binding

Hierarachical Related Binding : Hi quest202;The CheckBox IsChecked...

Hierarachical Related Binding : I have an Incident Report data...