Using an array of named tuples in LINQ

Question

I'm trying to use an array of named tuples in a LINQ (LINQ-to-object) query like this:

(int from, int to)[] inputRanges = { (1,2), (3,4) };

var result = from range in inputRanges
             select Enumerable.Range(range.from, range.to - range.from + 1);
return result.SelectMany(x => x);

However, I receive a compiler error, telling me that range has no member from and it instead expected a comma , instead of .from.

What am I doing wrong? Are named tuples and LINQ-to-objects not combinable?

If I use `.Item1` and `.Item2` instead it works - are named tuples a problem for LINQ? Why? — D.R., Nov 15 '18 at 18:35

score 4 · Accepted Answer · answered Nov 15 '18 at 18:51

4

The problem is that from is a keyword used by linq for iterating the items of the collection (from item in collection ...).

To solve it use @from in the linq:

var result = from range in inputRanges
             select Enumerable.Range(range.@from, range.to - range.@from + 1);

For more about the @ see: C# prefixing parameter names with @ . IMO the use of the property name from in this case is ok, but I do think in general this would be a bad practice.

answered Nov 15 '18 at 18:51

Gilad Green

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Oh boy...hahaha, thanks. I would have looked for another year without realizing it :D – D.R. Nov 15 '18 at 19:38
1

@D.R. - :) glad it helped you – Gilad Green Nov 15 '18 at 20:11

Using an array of named tuples in LINQ

1 Answers1