Question

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How can I pass an anonymous type to a method?

I have the following LINQ Statement, whose output has to be processed in another method:

var data = from lines in File.ReadAllLines(TrainingDataFile)
                             .Skip(ContainsHeader ? 1 : 0)
           let f = lines.Split(new[] { FieldSeparator }).ToList<String>()
           let target = f[TargetVariablePositionZeroBased]
           select new { F=f, T=target };

What should be the datatype of the parameter in the method that will take this data?

Answer 1

You can’t very easily pass anonymous types around. You can either create a class, or since your data has only two properties, use a Tuple:

select new Tuple<List<string>, string> (f, target);

If I have the data types correct, then the data type of the parameter would be:

IEnumerable<Tuple<List<string>, string>>

and you would reference F and T using the Tuple properties Item1 and Item2.