elmah.ir-post87-code1.cs

using System;
     
    namespace ThirtyDaysOfTDD.UnitTests
    {
        public class StringUtils
        {
            public int FindNumberOfOccurences(string sentenceToScan, string characterToScanFor)
            {
                try
                {
                    var stringToCheckAsCharacterArray = sentenceToScan.ToCharArray();
                    var characterToCheckFor = Char.Parse(characterToScanFor);
     
                    var numberOfOccurenes = 0;
     
                    for (var charIdx = 0; charIdx < stringToCheckAsCharacterArray.GetUpperBound(0); charIdx++)
                    {
                        if (stringToCheckAsCharacterArray[charIdx] == characterToCheckFor)
                        {
                            numberOfOccurenes++;
                        }
                    }
     
                    return numberOfOccurenes;
                }
                catch
                {
                    throw new ArgumentException();
                }
            }
        }
    }