Issue with Pre-selection

Manickam, Suraj 320

I need to preselect the list if it has only one item , i tried the one suggested in the MAUI official docs but it never seemed to work for me . I tried by manually setting the following in the constructor of the code behind of the view, if(viewModel.list.count==1) collectionView.SelectedItem=viewModel.list[0]; But it does not preselect it , is there any other way?

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 29,381 Reputation points Microsoft Vendor

2024-02-16T07:50:37.9033333+00:00
It doesn't work on Windows platform, right? (I tested on Android platform, it works)

There is a known issue reported at GitHub- Custom selection styles for items in CollectionView are ignored when programmatically selecting an item · Issue #18933 · dotnet/maui (github.com)

As a solution, please try the following on Windows platform

//execute following code after data populated _ = Task.Run(async () => { await Task.Delay(100).ContinueWith(e => { if (List.Count == 1) MySelectItem = List[0]; OnPropertyChanged(nameof(MySelectItem)); }); });
Manickam, Suraj 320 Reputation points

2024-02-16T09:04:56.9366667+00:00

Hi Zhang, I was talking about the Android platform , even though i manually set the selected items on appearing , it does not select it .
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,251 Reputation points Microsoft Vendor

2024-02-20T05:24:53.9033333+00:00

Did you set the SelectionMode="Single" in the Collectionview? If not, please set it. By the way, if you set the SelectionMode="Multiple", you need to use the SelectedItems and add items to the SelectedItems list. I tested in the Android 10 and Android 13; both are working as normal. If I set the SelectionMode

If you still have this issue, please share your layout code.
Manickam, Suraj 320 Reputation points

2024-02-23T07:13:51.4366667+00:00

Thanks Lu , I figured out the issue ! There was an issue with ItemSource getting intialized multiple times

Accepted answer

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,251 Reputation points Microsoft Vendor

2024-02-23T07:56:03.99+00:00

Hello,

Please do not initialize multiple times in ItemSource, it will make Pre-selection not working.

By the way, for windows, there is a known issue reported at GitHub- Custom selection styles for items in CollectionView are ignored when programmatically selecting an item · Issue #18933 · dotnet/maui (github.com) .

Thanks for your update.

Best Regards, Leon Lu

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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,251 Reputation points Microsoft Vendor

2024-02-23T07:57:39.9833333+00:00

Manickam, Suraj Thanks for your update. I summarize this issue in the answer. Please do not forget to accept it, it will help others who have similar issue.

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,251 Reputation points Microsoft Vendor

2024-03-05T02:16:38.38+00:00

Manickam, Suraj I have not heard from you for a couple of days. Please let me know if there is anything that I can help here.

Manickam, Suraj 320 Reputation points

2024-03-05T05:02:32.3433333+00:00

Hi Lu,

It is working fine now.
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Issue with Pre-selection

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