Error thrown when accessing resource values with OnPlatform from Resource Dictionary

[sbxamdev]

Description

Hi guys,

From MAUI's default app project, I just added a Resource item having double as the type and have separate values per platform.
Screenshot:

I dont have any issues in using it from xaml, however when I access it from c#, an error is thrown
Screenshot:

Additional Note: Trying the above c# code for resource that has single value for both platform works fine (Not OnPlatform syntax).

Please can anyone help? Thanks in advance, will greatly appreciate it. :)

Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

7.0.49

Last version that worked well

6.0

Affected platforms

Android, I was not able test on other platforms

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[mattleibow]

What is the value of value in the debugger?

[ghost]

Hi @sbxamdev. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. 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.

[sbxamdev]

What is the value of value in the debugger?

Hi, Its an OnPlatform<double>.

BTW It is working in my existing Xamarin.Forms App.
Also, someone in stackoverflow gave me a work-around which can be found here: https://sirjohnk.com/coding/MAUI-Snack-2/

[StephaneDelcroix]

but but but... OnPlatform declare an implicit cast operator to T, so it should work

[StephaneDelcroix]

I can reproduce this

[StephaneDelcroix]

Ok... there's no bug here, but you need to hint the C# compiler. From the compiler point of view, value is of type object, so it can not generate code that invokes the implicit cast operator defined in OnPlatform.

you can do it by changing your code to one of this 3 options

1. page.Resources.TryGetValue("RegularFontSize", out double value)
2. dblValue = (double)(value as OnPlatform<double>);
3. dblValue = (double)(OnPlatform<double>)value;