Simpler alternative for accessing master object from nested listview on XAF

Question

I want to know if there is simple and clear method other than this for accessing master object from a nested listview controller.

((PropertyCollectionSource)((ListView)View).CollectionSource).MasterObject

Do I have to write this in everywhere where i need to access master object?

I think this is not an elegant way and looks so lame.

thanks for editing my question @Sayse – Onur Jun 11 '15 at 09:24 — Onur, Jun 11 '15 at 09:24

score 3 · Accepted Answer · answered Jun 11 '15 at 13:31

3

Not tested yet, but you can use the following ViewController descendant:

public class NestedViewController : ViewController
{
    protected PropertyCollectionSource PropertyCollectionSource
    {
        get
        {
            return View is ListView ? ((ListView)View).CollectionSource is PropertyCollectionSource ? ((ListView)View).CollectionSource as PropertyCollectionSource : null : null;
        }
    }

    protected object MasterObject
    {
        get
        {
            return PropertyCollectionSource != null ? PropertyCollectionSource.MasterObject : null;
        }
    }
}

answered Jun 11 '15 at 13:31

ErikWitkowski

460
3
8

thx, that can be useful of course. so not many alternatives, right? – Onur Jun 11 '15 at 13:43
1

Yeah not so many alternatives, but if you inherit from this class instead of ViewController class, will make it clean and fast. – ErikWitkowski Jun 12 '15 at 14:11

Kirsten · Answer 2 · 2017-01-22T00:56:56.003

Simplifying the above answer with C#6

public partial class NestedViewController : ViewController
{
    protected PropertyCollectionSource PropertyCollectionSource => (View as ListView)?.CollectionSource as PropertyCollectionSource;

    protected object MasterObject => PropertyCollectionSource?.MasterObject;
}

Also I moved it into a function

public static class HandyControllerFunctions
{
    public static object GetMasterObject(View view)
    {
        var propertyCollectionSource = (view as ListView)?.CollectionSource as PropertyCollectionSource;
        return propertyCollectionSource?.MasterObject ;
    }
}

and call it for example

var myObject = HandyControllerFunctions.GetMasterObject(View) as IMyObject

Simpler alternative for accessing master object from nested listview on XAF

2 Answers2