/// <summary>
/// Sort a list of objects by relevance to a given string using Levenshtein Distance
/// </summary>
/// <typeparam name="T">Any object type</typeparam>
/// <param name="objects">The list of objects to sort</param>
/// <param name="searchTerm">The term to measure relevance to</param>
/// <param name="propertyToSortBy">x => x.PropertyName [the term will be matched against the value of this property]</param>
public static IEnumerable <T> SortByRelevance <T>(this IEnumerable <T> objects, string searchTerm, Func <T, string> propertyToSortBy)
{
var lev = new Levenshtein(searchTerm);
return(objects.Select(o => new
{
score = lev.DistanceFrom(propertyToSortBy(o)),
obj = o
})
.OrderBy(x => x.score)
.Select(x => x.obj));
}
/// <summary>
/// Sort a list of objects by relevance to a given string using Levenshtein Distance
/// </summary>
/// <typeparam name="T">Any object type</typeparam>
/// <param name="objects">The list of objects to sort</param>
/// <param name="searchTerm">The term to measure relevance to</param>
/// <param name="propertyToSortBy">x => x.PropertyName [the term will be matched against the value of this property]</param>
/// <param name="maxDistance">The maximum levenstein distance to qualify an item for inclusion in the returned list</param>
public static IEnumerable <T> SortByRelevance <T>(this IEnumerable <T> objects, string searchTerm, Func <T, string> propertyToSortBy, int?maxDistance = null)
{
var lev = new Levenshtein(searchTerm);
var res = objects.Select(o => new
{
score = lev.DistanceFrom(propertyToSortBy(o)),
obj = o
});
if (maxDistance.HasValue)
{
res = res.Where(x => x.score <= maxDistance.Value);
}
return(res.OrderBy(x => x.score)
.Select(x => x.obj));
}
