Linq style extension method for producing a table in markdown format from IEnumerable<T> source.

ToMarkdownTable

public static class LinqMarkdownTableExtensions
{
	public static string ToMarkdownTable<T>(this IEnumerable<T> source)
	{
		var properties = typeof(T).GetProperties();

		var maxColumnValues = source
			.Select(x => properties.Select(p => p.GetValue(x)?.ToString()?.Length ?? 0))
			.Union(new[] { properties.Select(p => p.Name.Length) }) // Include header in column sizes
			.Aggregate(
				new int[properties.Length].AsEnumerable(),
				(accumulate, x) => accumulate.Zip(x, Math.Max))
			.ToArray();

		var columnNames = properties.Select(p => p.Name);

		var headerLine = "| " + string.Join(" | ", columnNames.Select((n, i) => n.PadRight(maxColumnValues[i]))) + " |";
		var headerDataDividerLine = "| " + string.Join(" | ", properties.Select((n, i) => new string('-', maxColumnValues[i]))) + " |";

		var lines = new[]
			{
				headerLine,
				headerDataDividerLine,
			}.Union(
				source
				.Select(s =>
					"| " + string.Join(" | ", properties.Select((n, i) => (n.GetValue(s)?.ToString() ?? "").PadRight(maxColumnValues[i]))) + " |"));

		return lines
			.Aggregate((p, c) => p + Environment.NewLine + c);
	}
}