Why does BasedOn?

Question

Severity Code Description Project File Line Suppression State

Error (active) XFC0009 No property, BindableProperty, or event found for "BasedOn", or mismatching type between value and property. TipCalculator (net8.0-windows10.0.19041.0) C:\Users\ameli\source\repos\mslearn-dotnetmaui-use-shared-resources\exercise3\TipCalculator\StandardTipPage.xaml 15

I am referring to tutorial:
https://learn.microsoft.com/en-us/training/modules/use-shared-resources/7-exercise-create-and-apply-a-style

This question is related to the following Learning Module

Answer 1

After testing, I tested the BasedOn property with the following code and this issue did not occur.

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"

             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

             x:Class="MauiApp6.MainPage">

<ContentPage.Resources>

	<Style x:Key="baseLabelStyle" TargetType="Label">

	<Setter Property="FontSize" Value="Caption" />

	</Style>

	<Style x:Key="infoLabelStyle" BasedOn="{StaticResource baseLabelStyle}" TargetType="Label">

	<Setter Property="FontAttributes" Value="Bold" />

	</Style>

</ContentPage.Resources>

<ScrollView>

	<Label Text="test" Style="{StaticResource infoLabelStyle}"/>

</ScrollView>

 

</ContentPage>

According to MauiMaui API documentation, Style.BasedOn Property is a basic property. Therefore, this issue is more of a namespace issue. Does your Maui project include the Nuget Package for Microsoft.Maui.Controls? If you update it to the latest version, will this issue still occur?