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Asked: 2026-06-14T10:31:52+00:00

Code : Dictionary<string, IList<PuntoMappa>> first = new Dictionary<string, IList<PuntoMappa>>(); Dictionary<string, IList<PuntoMappa>> second = new

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Code :

    Dictionary<string, IList<PuntoMappa>> first = new Dictionary<string, IList<PuntoMappa>>();
    Dictionary<string, IList<PuntoMappa>> second = new Dictionary<string, IList<PuntoMappa>>();
    second = second.Union(first);

seems that I missing a explicit cast?

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1 Answer

  1. Editorial Team

    “Union” returns an IEnumerable – not a dictionary.

    If you want an IEnumerable – you need a new variable:

    var newEnumerable = second.Union(first);

    Or – to create a new dictionary:

    second = second.Union(first).ToDictionary(kv => kv.Key, kv => kv.Value);
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