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June 17, 2019 09:24
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get cities from some country
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public Task<string> FindCity(string postalCode) | |
{ | |
var jsonStream = EmbeddedResourceHelper.FromResources("postal_codes.json"); | |
var dictionary = DeserializeStream<Dictionary<string, string>>(jsonStream); | |
if (dictionary.ContainsKey(postalCode)) | |
return Task.FromResult(dictionary[postalCode]); | |
var collectionRange = dictionary.Where(e => e.Key.Contains("-")); | |
var result = FindCityFromRangeRecords(postalCode, collectionRange); | |
return Task.FromResult(result); | |
} | |
static T DeserializeStream<T>(Stream stream) | |
{ | |
var serializer = new JsonSerializer(); | |
using (var reader = new StreamReader(stream)) | |
using (var json = new JsonTextReader(reader)) | |
{ | |
return serializer.Deserialize<T>(json); | |
} | |
} | |
static string FindCityFromRangeRecords(string postalCode, IEnumerable<KeyValuePair<string, string>> collectionRange) | |
{ | |
foreach (var entry in collectionRange) | |
{ | |
var keys = entry.Key.Split('-'); | |
var startRange = int.Parse(keys[0]); | |
var endRange = int.Parse(keys[1]); | |
var postalCodeInt = int.Parse(postalCode); | |
if (postalCodeInt >= startRange && postalCodeInt <= endRange) | |
return entry.Value; | |
} | |
return null; | |
} |
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