Dynamically Updating Language Library in MAUI

Create a class.

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public class LocalizationResourceManager : INotifyPropertyChanged
{
    private LocalizationResourceManager()
    {
        AppResources.Culture = CultureInfo.CurrentCulture;
    }

    public static LocalizationResourceManager Instance { get; } = new();

    public object this[string resourceKey] =>
        AppResources.ResourceManager.GetObject(resourceKey, AppResources.Culture) ?? Array.Empty<byte>();

    public event PropertyChangedEventHandler? PropertyChanged;

    public void SetCulture(CultureInfo culture)
    {
        AppResources.Culture = culture;
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(null));
    }
}

This class creates a static instance Instance.

Create resource files.
Create a new project Resource1.resx.

Switch languages.

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LocalizationResourceManager.Instance.SetCulture(new CultureInfo("zh"));
LocalizationResourceManager.Instance.SetCulture(new CultureInfo("en"));

Frontend reference.
Add namespace reference.

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xmlns:resources="clr-namespace:RuiChao.Resource.Classes;assembly=RuiChao.Resource"

Direct static binding.

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<Label Text="{Binding Source={x:Static resources:LocalizationResourceManager.Instance}, Path=[Ventilation]}" />

Create a resource dictionary binding.

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<ResourceDictionary>
    <x:StaticExtension Member="resources:LocalizationResourceManager.Instance" x:Key="Localization"/>   
</ResourceDictionary>
<Label Text="{Binding Source={StaticResource Localization}, Path=[MainTitle]}" />

If dynamic updates are not needed, bind directly to text resources.

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xmlns:resources="clr-namespace:RuiChao.Resource.Localization;assembly=RuiChao.Resource"
<RadioButton Content="{x:Static resources:AppResources.Ventilation}" Value="{x:Byte 0}" />

Backend reference.

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string Name = $"{LocalizationResourceManager.Instance["Volume"]}";