C#•2y ago

Using Selected Items in WPF to Filter Buses and put the Filtered Buses in a ComboBox

CmbBus should output the name of bus4 after I select matching properties of bus4 but the combo box is still empty. How do I fix this so it will show any bus that matches with the properties I selected. Let me know if you need more details. This is my BusesViewModel code: https://pastebin.com/DfnM7V7B

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53 Replies

Kouhai•2y ago

$paste

MODiX•2y ago

If your code is too long, you can post to https://paste.mod.gg/ and copy the link into chat for others to see your shared code!

Kouhai•2y ago

Please paste there instead of pastebin ThumbsUpSmile

s0wiOP•2y ago

https://paste.mod.gg/adgzortxniiq/0

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Kouhai•2y ago

Okay couple of things here First you raise OnPropertyChanged on FilteredBuses, but FilteredBuses isn't actually changed Second, why are you making the Buses prop an ObservableCollection if you're not binding to it?

s0wiOP•2y ago

Sorry I’m new and I’m still not sure how data binding works I took some of the code in chatgpt😢 sorry Ill just remove filtered buses? is it not necessary to have it there?

Kouhai•2y ago

Can you show your xaml file as well 😅 ?

s0wiOP•2y ago

Yesyes

s0wiOP•2y ago

https://paste.mod.gg/ukvztomknjtm/1

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s0wiOP•2y ago

My Bus class if you need it🙌 https://paste.mod.gg/fmwawkkkfvna/2

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Kouhai•2y ago

Sorry was away, lemme check them real quick Alright, you need to change the logic to something like this

public Time SelectedTime
 {
  get => _selectedTime;
  set
  {
    _selectedTime = value;
    matchingBuses = MatchingBuses()
    OnPropertyChanged(nameof(FilteredBuses));
  }
}

public Time SelectedTime
 {
  get => _selectedTime;
  set
  {
    _selectedTime = value;
    matchingBuses = MatchingBuses()
    OnPropertyChanged(nameof(FilteredBuses));
  }
}

s0wiOP•2y ago

Will this be the same for the others? I'll try this right now

s0wiOP•2y ago

s0wiOP•2y ago

still empty?

Kouhai•2y ago

Gimme a second to take a look at the code again 😅 OH Change MatchingBuses to a method and change

- public IEnumerable<Bus> FilteredBuses => MatchingBuses;
+ public IEnumerable<Bus> FilteredBuses => matchingBuses;

- public IEnumerable<Bus> FilteredBuses => MatchingBuses;
+ public IEnumerable<Bus> FilteredBuses => matchingBuses;

s0wiOP•2y ago

Kouhai•2y ago

Yeah

s0wiOP•2y ago

its still empty 😦

s0wiOP•2y ago

is my selected items not matching? or the filter method is not working TT

Kouhai•2y ago

Are you using CommunityToolkit.MVVM?

s0wiOP•2y ago

i dont remember downloading that

Kouhai•2y ago

Okay go over to your BusesViewModel and hover over ObservableObject next to it Under what namespace is it? Also Are you 100% sure you're binding to your ViewModel?

s0wiOP•2y ago

DigiTrip_App.Core.ObservableObject

s0wiOP•2y ago

not suree

Kouhai•2y ago

Okay, F12 over it

s0wiOP•2y ago

Kouhai•2y ago

@s0wi When you run the program does an icon like this show up on the top

s0wiOP•2y ago

Where exactly? i dont see any symbols like that

Kouhai•2y ago

s0wiOP•2y ago

Kouhai•2y ago

The program's window

s0wiOP•2y ago

Kouhai•2y ago

Okay, can you select a date and check if it changes to red?

s0wiOP•2y ago

omg yes

s0wiOP•2y ago

also time i was so confused why it turns red earlier 🫠 What does this mean tho? should I convert something?

Kouhai•2y ago

No you don't need a converter You can simply do

DisplayMemberPath="Departure"
SelectedValuePath="Departure"
SelectedValue="{Binding SelectedTime, Mode=TwoWay}"

DisplayMemberPath="Departure"
SelectedValuePath="Departure"
SelectedValue="{Binding SelectedTime, Mode=TwoWay}"

Don't bind SelectedItem, bind to SelectedValue on your item source's elemenets

s0wiOP•2y ago

Okk Why not selectedItem?

Kouhai•2y ago

Do this for the other control as well SelectedItems WILL force you to make a converter

s0wiOP•2y ago

i do this to Date also? not from and to?

Kouhai•2y ago

Because SelectedItems means bind an item from the ItemSource to a property, your item source has Bus objects in them, it can't bind to DateTime or Time

s0wiOP•2y ago

Ohhh

Kouhai•2y ago

From and To bind to their respective types

s0wiOP•2y ago

Ill change them to Selected Value also?

Kouhai•2y ago

No need, the properties are already of type BusTerminal

s0wiOP•2y ago

THANK YOU SO MUCH TVT THIS REALLY HELPED

s0wiOP•2y ago

Wait is it important that I put selected value path?

Kouhai•2y ago

It's important, without it the binding will fail

s0wiOP•2y ago

Are you busy after this? I might add a question here later TvT

Kouhai•2y ago

I'd probably be busy yeah, you can open another thread or head over at #gui Some amazing people are very active ThumbsUpSmile

s0wiOP•2y ago

THANK YOU SO MUCH

Kouhai•2y ago

s0wiOP•2y ago

@Kouhai can you help? https://discordapp.com/channels/143867839282020352/1092101105858662550/1092101105858662550

MODiX•2y ago

s0wi#3448

Please help me, I'm confused why it doesn't show up when my other View like cancellation shows up just fine. Can someone help me so that it would show once I click on the Travel History? I would really appreciate who helps. Tell me if you want more details. For now this is the link of the usercontrol and mainwindow.xaml: https://paste.mod.gg/aialvcampztg/0

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Using Selected Items in WPF to Filter Buses and put the Filtered Buses in a ComboBox