block13.cs

using Microsoft.AspNetCore.Html;
Formatter<DataDebuggerPreview>.Register((preview, writer) =>
{
    var headers = new List<IHtmlContent>();
    headers.Add(th(i("index")));
    headers.AddRange(preview.ColumnView.Select(c => (IHtmlContent) th(c.Column.Name)));
    var rows = new List<List<IHtmlContent>>();
    var count = 0;
    foreach (var row in preview.RowView)
    {
        var cells = new List<IHtmlContent>();
        cells.Add(td(count));
        foreach (var obj in row.Values)
        {
            cells.Add(td(obj.Value));
        }
        rows.Add(cells);
        count++;
    }
    
    var t = table(
        thead(
            headers),
        tbody(
            rows.Select(
                r => tr(r))));
    
    writer.Write(t);
}, "text/html");