A simple C# script to count and display character frequency in a given string

CharFrequencyCounter.cs

	public class Program
	{
		public static void Main()
		{
			var sentence = AnsiConsole.Prompt(new TextPrompt<string>("What's your [green]sentence[/]?")
				.Validate(input =>
					string.IsNullOrWhiteSpace(input)
						? ValidationResult.Error("An input is required!")
						: ValidationResult.Success()));

			var chars = Enumerable.Range(65, 26)
				.Select(x => (char) x)
				.ToList();

			var table = new Table();
			chars.ForEach(x => table.AddColumn(new TableColumn(x.ToString()).Centered()));

			table.AddRow(chars.Select(x =>
					$"[green]{sentence.Count(y => y.ToString().Equals(x.ToString(), StringComparison.InvariantCultureIgnoreCase))}[/]")
				.ToArray());
			AnsiConsole.Render(table);
		}
	}