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feat: Better implementation of DictionaryExtensions.ToInverse

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This commit is contained in:
Chris Cameron
2018-10-16 14:31:53 -04:00
parent 23a068d0c9
commit 85ab631ef5
3 changed files with 41 additions and 2 deletions
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18
ICD.Common.Utils/Extensions/DictionaryExtensions.cs
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@@ -452,12 +452,26 @@ namespace ICD.Common.Utils.Extensions
/// <param name="extends"></param>
/// <returns></returns>
[PublicAPI]
public static Dictionary<TValue, TKey> ToInverse<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> extends)
public static Dictionary<TValue, List<TKey>> ToInverse<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> extends)
{
if (extends == null)
throw new ArgumentNullException("extends");
return extends.ToDictionary(kvp => kvp.Value, kvp => kvp.Key);
Dictionary<TValue, List<TKey>> output = new Dictionary<TValue, List<TKey>>();
foreach (KeyValuePair<TKey, TValue> kvp in extends)
{
List<TKey> keys;
if (!output.TryGetValue(kvp.Value, out keys))
{
keys = new List<TKey>();
output.Add(kvp.Value, keys);
}
keys.Add(kvp.Key);
}
return output;
}
}
}