ClassExtension

ClassExtension.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace ClassExtension
{
    public static class StringBuilderExtension
    {
        public static StringBuilder AppendFormatLoop(this StringBuilder instance,
            string format, IEnumerable<Object> objects)
        {
            foreach (Object obj in objects)
            {
                instance.AppendFormat(format, obj.ToString());
            }

            return instance;
        }
        
        public static StringBuilder ForEach(this StringBuilder @this,
            IEnumerable<object> args, string format = null, string delimiter = null)
        {
            return forEach(@this, args, format, delimiter, false);
        }

        public static StringBuilder ForEachLine(this StringBuilder @this,
            IEnumerable<object> args, string format = null, string delimiter = null)
        {
            return forEach(@this, args, format, delimiter, true);
        }

        private static StringBuilder forEach(StringBuilder @this,
            IEnumerable<object> args, string format, string delimiter, bool newline)
        {
            int prev_length = @this.Length;

            foreach (var arg in args)
            {
                if (string.IsNullOrEmpty(format)) { @this.Append(arg); }
                else { @this.AppendFormat(format, arg); }

                if (string.IsNullOrEmpty(delimiter) == false) { @this.Append(delimiter); }

                if (newline) { @this.AppendLine(); }
            }

            if (string.IsNullOrEmpty(delimiter) == false && prev_length != @this.Length)
            { @this.Remove(@this.Length - delimiter.Length, delimiter.Length); }

            return @this;
        }
    }
}