Named tuple in dictionary?

Question

i'm trying to create a dictionary with a string key and a tuple value(string, bool). I'd like to make the tuple a named one, so something like:

Dictionary<string, (string, bool)> spColumnMapping = new Dictionary<string, (string, bool)>();

Is it possible?

Thanks

` Dictionary<String, Tuple<String, Boolean>> dict = new Dictionary<String, Tuple<String, Boolean>>();` — jAC
– jAC, Commented Aug 3, 2018 at 14:47
var spColumnMapping = new Dictionary<string, (string name, bool theBool)>();. Works. — Tim Schmelter
– Tim Schmelter, Commented Aug 3, 2018 at 14:47
@KennethK. That line compiles fine, the problem is i don't know how to name the properties in the tuple. I tried doing it in the next statement but i got a warning saying the names would be ignored since they weren't defined when the tuple was created. — Gonzalo
– Gonzalo, Commented Aug 3, 2018 at 14:48
It is totally unclear to me what the problem is. Why didn't named tuples work in your case? Did you try just putting the names in? — Patrick Hofman
– Patrick Hofman, Commented Aug 3, 2018 at 14:50

Stuart · Accepted Answer · 2018-08-03 14:49:21Z

28

void Main() { Dictionary<string, (string Foo, bool Bar)> spColumnMapping = new Dictionary<string, (string, bool)>(); spColumnMapping.Add("foo", ("Quax", false)); var x = spColumnMapping["foo"]; Console.WriteLine(x.Foo); // prints Quax Console.WriteLine(x.Bar); // prints False }

Just name the parameters after the type.

answered Aug 3, 2018 at 14:49

Stuart

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2 Comments

Joe Farrell Over a year ago

Yep. You can also use var and name the elements of the tuple in the new expression, like so: var spColumnMapping = new Dictionary<string, (string Foo, bool Bar)>();. I think this is a lot easier to parse mentally when you have a complex type.

Robert Paulson Over a year ago

I found that even with naming the tuples as above, when using TryGetValue I had to write

if (spColumnMapping.TryGetValue("foo", out (string Foo, bool Bar) item)) { Console.WriteLine(${item.Foo}, {item.Bar}"); }

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