ant-design-blazor/site/AntDesign.Docs/Shared/Style.razor

@using System.Net
@using AntDesign.Docs.Utils
@inherits ComponentBase
@inject HtmlRenderService HtmlRenderService

@((MarkupString)$"<style>{Styles}</style>")

@code {

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    [Parameter]
    public string ScopeId { get; set; }

    protected string Styles { get; set; }

    protected override async Task OnInitializedAsync()
    {
        if (ChildContent != null)
        {
            var text = await HtmlRenderService.RenderAsync(ChildContent);
            var style = WebUtility.HtmlDecode(text)?.Replace("<style>", "").Replace("</style>", "");
            if (!string.IsNullOrEmpty(style))
            {
                var parser = new CSSParser(style);
                Styles = parser.AddScopeIdToString(ScopeId);
            }
        }
    }

}