Best way to map one value to many

Question

I was wondering about the best way to map one value to many in a dictionary (or some other structure) in C#.

What I wanted to do is something like this:

public GenreToEntity = new Dictionary<string, string[]>()
{
    { "filmes", ["Filme"] },
    { "programas", ["Jornalismo", "Variedade", "Série/seriado"] }
};

But it should be static, so I don't want to add values line by line. Is that possible?

"But it should be static, so I don't want to add values line by line." I don't understand what one has to do with the other. — itsme86, Aug 05 '19 at 18:27
"Is that possible?" Yes. Did you try? What problem did encounter? — Theraot, Aug 05 '19 at 18:28
What you have is close. You just need to tweak it slightly: `{ "programas", new[] { "Jornalismo", "Variedade", "Série/seriado" } }` Is that what you're looking for? — itsme86, Aug 05 '19 at 18:33
List is much more flexible than arrays. Check out the methods! — TaW, Aug 05 '19 at 18:54
@TaW So you just always use lists over arrays then? Even if there's no chance you'll be adding or removing elements at runtime? Just a collection of values that won't change? — itsme86, Aug 05 '19 at 19:13
Yes, pretty much. I'm not often sure my collections will never change or grow.. — TaW, Aug 05 '19 at 19:22

Jéssica Carneiro · Accepted Answer · 2019-08-05T18:56:09.163

1

I got it! The missing part was what @itsme86 suggested:

public static Dictionary<string, List<string>> EntityToGenre = new Dictionary<string, List<string>>()
{
    { "filmes", new List<string>() {"Filme"} },
    { "novelas", new List<string>() {"Novela"} },
    { "programas", new List<string>() {"Jornalismo", "Variedade", "Série/seriado", "Outros" } }
};

edited Aug 05 '19 at 18:56

answered Aug 05 '19 at 18:44

Jéssica Carneiro

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Best way to map one value to many

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