gistfile1.cs

using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;

namespace BadChars.Tests
{
    [TestFixture]
    public class BadCharsTests
    {
        [Test]
        public void Input_with_bad_characters_should_be_replaced_with_approprate_character()
        {
            var badChars = new[] {(char) 96, (char) 8216, (char) 8217, (char) 8242, (char) 769, (char) 768,
        (char) 8220, (char) 8221, (char) 8243, (char) 12291,(char)8208, (char)8211, (char)8212, 
        (char)8722, (char)173, (char)8209, (char)8259,(char)160, (char)8195, (char)8194};
            var badString = new string(badChars);
            var cleanedString = CleanInput(badString);

            Assert.That(cleanedString, Is.EqualTo("''''''\"\"\"\"-------   "));

        }

        private static readonly CharReplacementMap _replacements = new CharReplacementMap
        {
            {45, new[] {8208, 8211, 8212, 8722, 173, 8209, 8259}},
            {39, new[] {96, 8216, 8217, 8242, 769, 768}},
            {34, new[] {8220, 8221, 8243, 12291}},
            {32, new[] {160, 8195, 8194}}
        };

        public string CleanInput(string input)
        {
            IEnumerable<char> characters = input.Select(c => _replacements.Replace(c));
            return new string(characters.ToArray());
        }

        private class CharReplacementMap : Dictionary<char, char>
        {
            public void Add(int goodCharCode, IEnumerable<int> badCharCodes)
            {
                foreach (char c in badCharCodes)
                    Add(c, (char)goodCharCode);
            }

            public char Replace(char character)
            {                
                TryGetValue(character, out character);
                return character;
            }
        }
    }

}