public async Task <List <string> > SearchFileAsync(string searchName, float range, int max, CancellationToken cancelToken)
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Restart();
List <string> Result = new List <string>(max);
if (searchName != string.Empty)
{
string searchNameLower = searchName.ToLower();
await Task.Run(() =>
{
Algorithms.LevenshteinDistance levenshteinDistance = new LevenshteinDistance();
var Contains = _IndexDictionary
.AsParallel()
.WithCancellation(cancelToken)
.Where(x => x.Key.Contains(searchNameLower))
.OrderBy(x => 1.0 - levenshteinDistance.CalculateNormalizedDistance(searchNameLower, x.Key))
.SelectMany(x => x.Value.ToArray());
Result.AddRange(Contains.Take(max));
if (Result.Count >= max)
{
return;
}
if (cancelToken.IsCancellationRequested)
{
return;
}
var NotContains = _IndexDictionary
.AsParallel()
.WithCancellation(cancelToken)
.Where(x => !x.Key.Contains(searchNameLower) && (1.0 - levenshteinDistance.CalculateNormalizedDistance(searchName, x.Key)) <= range)
.OrderBy(x => 1.0 - levenshteinDistance.CalculateNormalizedDistance(searchNameLower, x.Key))
.SelectMany(x => x.Value.ToArray());
int RemainCapacity = max - Result.Count;
Result.AddRange(NotContains.Take(RemainCapacity));
if (cancelToken.IsCancellationRequested)
{
return;
}
});
}
stopwatch.Stop();
LogStatics.Debug(string.Format("search at {0:F3} s", (float)stopwatch.Elapsed.TotalSeconds));
return(Result);
}
