public static ConcurrentBag <ICityResult> SearchConcurrent(List <string> cities, int nextCharacterPosition)
{
var result = new ConcurrentBag <ICityResult>();
ICityResult cityResult = new CityResult();
Parallel.ForEach(cities, x =>
{
cityResult.NextCities.Add(x);
cityResult.NextLetters.Add(x[nextCharacterPosition].ToString());
});
result.Add(cityResult);
return(result);
}
public ICityResult Search(string searchTerm)
{
/* Lowing string to keep it consistent, will do the same for data set */
string lowerSearchTerm = searchTerm.ToLower();
/* Store length in int. As arrays are 0 index based, a 4 character search term will
* will give 5th character in the array which will be the next character needed for the NextLetters collection.
*/
int nextCharacterPosition = searchTerm.Length;
List <string> cities = _cityRepository
.GetCities().Where(x => x.ToLower().StartsWith(lowerSearchTerm)).ToList();
ICityResult cityResult = new CityResult();
/*
* Parallel Foreach, unlike a standard Foreach,
* do multiple operations together to help speed up to process, utilising multithreading.
* This will help with large datasets.
*
* Leaving this in commented as it's something I've tried but the returned is inconsistent/wrong.
*
* ConcurrentBag<ICityResult> searchResults = SearchConcurrent(cities, nextCharacterPosition);
*/
cities.ForEach(city =>
{
cityResult.NextCities.Add(city);
if (city.Length > nextCharacterPosition)
{
cityResult.NextLetters.Add(city[nextCharacterPosition].ToString());
}
});
return(cityResult);
}