相当于Javas Guavas Maps.uniqueIndex的C＃

Question

Guava has a static method

Maps.uniqueIndex(Iterable<V> values, Function<? super V,K> keyFunction) 

which maps each entry in the entered collection by the result of the entered function applied on respective elements.

Is there any analogues for C# that do the same?

Java sample

Map<String, Human> idToHuman = Maps.uniqueIndex(humans, Human::getPassportId) ;

Answer 1

In case of C# where we have IEnumerable<V> instead of Iterable<V> and Dictionary insetead of Map . That's why we can put in C#

using System.Linq;

...

Dictionary<K, V> result = values.ToDictionary(v => keyFunction(v));

where values impelements IEnumerable<V> and keyFunction is Func<V, K> . In your case C# code can be something like this

using System.Linq;

... 

// I've turned Java getPassportId method into PassportId property 
// "Dictionary<String, Human>" declaration can be changed into just "var" 
Dictionary<String, Human> idToHuman = humans.ToDictionary(human => human.PassportId);