C#•3y ago

❔ WPF Binding to collection in static instance not updating list

I have a collection in a static member of a class that's being changed. It should be firing

PropertyChanged

PropertyChanged

for the property shown below. But the list never updates.

dgPredefined.SetBinding(System.Windows.Controls.ItemsControl.ItemsSourceProperty, new System
    .Windows.Data.Binding("AllItemsSortedByName")
    {
        Source = Data.NetworkMgr.mgr,
        NotifyOnTargetUpdated = true,
    });

dgPredefined.SetBinding(System.Windows.Controls.ItemsControl.ItemsSourceProperty, new System
    .Windows.Data.Binding("AllItemsSortedByName")
    {
        Source = Data.NetworkMgr.mgr,
        NotifyOnTargetUpdated = true,
    });

The original plan was to declare it in the XAML, but I haven't figured out the equivalent syntax. Can someone tell me what I'm doing wrong? I tried both

NotifyOnTargetUpdated

NotifyOnTargetUpdated

as shown above and

NotifyOnSourceUpdated

NotifyOnSourceUpdated

. My orignal impression was the latter is for when the control needs to be notified the source has changed. But after reading the documentation, it looks like it's the other way around. With

Data.NetworkMgr.mgr

Data.NetworkMgr.mgr

Data

Data

is a namespace,

NetworkMgr

NetworkMgr

is a class, and

mgr

mgr

is the static instance of

Data.NetworkMgr

Data.NetworkMgr

ACiDCA7•10/6/23, 10:44 AM

lets get the general stuff cleared first
-why are you doing the binding in codebehind?
-is mgr a list?
-if its a list does it implement Inotifycollectionschanged?
-does the class itself implement inotifypropertychanged
-are you invoking onpropertychanged

ACiDCA7•10/6/23, 10:45 AM

-maybe typo in propertyname?

ACiDCA7•10/6/23, 10:45 AM

-is the "static instance" even a property?

ACiDCA7•10/6/23, 10:51 AM

@Will Pittenger also some more code would help.. if its on github on so a link would be beneficial

ACiDCA7•10/6/23, 10:54 AM

there is too much to guess from just your snippet

Will PittengerOP•10/6/23, 2:48 PM

The class does implement . I mentioned

PropertyChanged

PropertyChanged

. As for the collection, after I left last night, I realized the collection is the property a expansion. Would that cause problems.

AACiDCA7 -is the "static instance" even a property?

Will PittengerOP•10/6/23, 2:48 PM

Not yet, but I can make it one.

Will PittengerOP•10/6/23, 2:49 PM

I am firing

PropertyChanged

PropertyChanged

. And I checked the property name several times.

Will PittengerOP•10/6/23, 2:50 PM

No code on GitHub.

Will PittengerOP•10/6/23, 2:52 PM

The declaration chain with some extra stuff removed:

Will PittengerOP•10/6/23, 2:56 PM

Got to go.

Will PittengerOP•10/6/23, 2:56 PM

Be back later.

Will PittengerOP•10/7/23, 1:42 AM

@ACiDCA7 So is there a collection option that might not have issues? The code I have now, still what's above, throws an exception in the dictionary's enumerator because the contents changed.

Will PittengerOP•10/7/23, 2:05 AM

I did just create a repository on GitHub for it. https://github.com/ChatZilla-Replacement-Project/Best-Chat

GitHub

GitHub - ChatZilla-Replacement-Project/Best-Chat: This is a mockup ...

This is a mockup done in C# and WPF. Some functionality is present. - GitHub - ChatZilla-Replacement-Project/Best-Chat: This is a mockup done in C# and WPF. Some functionality is present.

Accord•10/8/23, 2:29 AM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.