using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ReportViewer
{
    public static class Extensions
    {
        public static string JoinString(this IEnumerable<string>? list, string separator = ",")
        {
            if (list == null) 
                throw new ArgumentNullException(nameof(list));
            return list.Aggregate(new StringBuilder(), (current, next) => 
                current.Append(current.Length == 0 ? string.Empty : separator).Append(next)).ToString();
        }
    }
}