There is a more or less recent (Jan 2020) video on YouTube explaining how to use a compound where clause in LINQ. In this example, the where is used twice, but for objects that are not related. When I try this in Visual Studio 2017 (in a Program.cs file) I get an error:
Error: Predefined type 'System.ValueTuple`2' is not defined or imported
Previously I was getting an error about the foreach clause.
The example is here: https://www.youtube.com/watch?v=uUsnDXYRADA&t=263s , and is as follows: int[] numbersA = {0, 2, 4, 5, 6, 8, 9}; int[] numbersB = {1, 3, 5, 7, 8};
var pairs = from a in numbersA
from b in numbersB
where a < b
select (a, b);
Console.WriteLine("Pairs where a < b:");
foreach (var pair in pairs)
{
Console.WriteLine($"{pair.a} is less than {pair.b}");
}
I have VS Professional 2017, with ASP.NET Web Frameworks and Tools 5.2.6, Core Razor 15.8, C# Tools 2.10 LINQ works in the system, but this query does not.
