emoji symbol in the code

Hi Ben Tan,

Thank you for reaching out to us on Microsoft Q&A forum.   

It appears that you're encountering a compatibility issue due to the use of the [EditorRequired] attribute, which was introduced in .NET 7. This attribute is not available in .NET 6, which is likely causing the compiler error you’re seeing. 

To resolve this issue, you can modify the code by removing the [EditorRequired] attribute. Here is the updated code compatible with .NET 6: 

@code {
    [Parameter]
    public List<TItem> Items { get; set; }

    [Parameter]
    public RenderFragment<TItem> ItemContent { get; set; }

    [Parameter]
    public Func<TItem, MarkupString> ItemLabel { get; set; }

    int selectedIndex;

    bool previousDisabled => selectedIndex == 0;
    bool nextDisabled => selectedIndex == Items.Count - 1;

    void IncrementIndex() => selectedIndex++;
    void DecrementIndex() => selectedIndex--;
    void SetIndex(int index) => selectedIndex = index;

    protected override void OnInitialized() =>
        selectedIndex = Items.Count - 1;
}

Removing the [EditorRequired] attribute should allow your code to compile and run properly in .NET 6. 

Please feel free to contact us if you have any additional questions.     

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Thank you.