Picker ‘SelectedIndex’ is not effective

[JusterZhu]

Description

When Piker binds a collection or creates Picker.Items, setting SelectedIndex to 0 in xaml does not take effect, and UI has no effect.

Steps to Reproduce

XAML：
<StackLayout Margin="0,0,100,0" Grid.Row="7" Orientation="Horizontal" HeightRequest="35" HorizontalOptions="Center"> <Label VerticalOptions="Center" Text="encoding :"></Label> <Picker WidthRequest="400" HeightRequest="30" Margin="9,0,3,0" SelectedIndex="0" ItemsSource="{Binding Encodings}" /> </StackLayout>

C#：
public List<string> Encodings { get { if (_currentEncoding == null) { _encodings = new List<string>(); _encodings.Add("Default"); _encodings.Add("UTF8"); _encodings.Add("UTF7"); _encodings.Add("Unicode"); _encodings.Add("UTF32"); _encodings.Add("BigEndianUnicode"); _encodings.Add("Latin1"); _encodings.Add("ASCII"); } return _encodings; } }

Link to public reproduction project repository

https://github.com/dotnet/maui

Version with bug

6.0.486 (current)

Last version that worked well

6.0.408

Affected platforms

Windows

Affected platform versions

windows10.0.19041

Did you find any workaround?

No response

Relevant log output

No response

[ghost]

Hi @JusterZhu. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[jfversluis]

You entered the .NET MAUI repository under the reproduction link, please add the right link so we can have a look, thanks!

[JusterZhu]

You entered the .NET MAUI repository under the reproduction link, please add the right link so we can have a look, thanks!

I don't know how to fill in the correct path. It is not necessary to submit an issue before.

[akhanalcs]

Hi @JusterZhu , what @jfversluis meant is that you should provide a link to the code repository which .NET MAUI team can use to run and view your issue.
You can do this by 2 ways (just use one that's convenient for you):
1.Create a new code repository in GitHub, upload your code to it. Grab a link to it and share it in your issue.
2.Zip your code folder, upload here.

Before you share your code, make sure you remove things you can't share with the public.
If that is too much effort, create a new simple .NET MAUI app, include just the code that can be used to demonstrate your issue and share it here.

For an example, just take a look at some other issues where users have shared their code.

[jsuarezruiz]

Same or similar to #7138

[JusterZhu]

Hi @JusterZhu , what @jfversluis meant is that you should provide a link to the code repository which .NET MAUI team can use to run and view your issue. You can do this by 2 ways (just use one that's convenient for you): 1.Create a new code repository in GitHub, upload your code to it. Grab a link to it and share it in your issue. 2.Zip your code folder, upload here.

Before you share your code, make sure you remove things you can't share with the public. If that is too much effort, create a new simple .NET MAUI app, include just the code that can be used to demonstrate your issue and share it here.

For an example, just take a look at some other issues where users have shared their code.

https://github.com/JusterZhu/GeneralUpdate/blob/dev/src/c%23/GeneralUpdate.PacketTool/MainPage.xaml