linq lambda multiple steps array

Question

I cannot find out if this is possible, and if I want to push lambda too far. I do not like the double regex (the Class.Column is not mine). I have this simple select function :

(ColumNames is a List)

string reg = "(.*):(.*)";
Class.Column[] Columns = (Class.Column[])this.ColumnNames
    .Select(x =>
        new Class.Column() {
            Param1 = Regex.Match(x, reg).Groups[1].ToString(),
            Param2 = Regex.Match(x, reg).Groups[2].ToString()
        }
    );

Is there a way to set the regex output as z, then param1 = z1.Groups[1].ToString()?

why not just x.Split(':')

Slai
– Slai

2017-02-03 10:34:48 +00:00
Commented Feb 3, 2017 at 10:34 — Slai
– Slai, Commented Feb 3, 2017 at 10:34

Bruno Belmondo · Accepted Answer · 2017-02-03 10:27:19Z

2

You can linq multiple Select to perform multiple transformations. You also have to replace the cast by a ToArray feature

        Class.Column[] Columns = this.ColumnNames
            .Select(x=> Regex.Match(x, reg))
            .Select(z =>
            new Class.Column()
            {
                Param1 = z.Groups[1].ToString(),
                Param2 = z.Groups[2].ToString()
            }).ToArray();

edited Feb 3, 2017 at 10:27

answered Feb 3, 2017 at 10:23

Bruno Belmondo

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2 Comments

Maarten Over a year ago

I think the .ToArray() is necessary. The casting of the result of .Select(...) to an array will fail since it is not an array.

Bruno Belmondo Over a year ago

You are right. What I wanted to say is that the correct way of doing this is using the ToArray() feature, not that it would be preferable.

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