CODEWITHSUNDEEP
c#castingienumerable
Ivan
Ivan

Reputation: 7746

Cast IEnumerable<Class> to List<string>

I have a List<IOhlcv> and I need to get the string[] of DateTime strings from the List:

public interface ITick
{
    DateTimeOffset DateTime { get; }
}

public interface IOhlcv : ITick
{
        decimal Open { get; set; }
        decimal High { get; set; }
        decimal Low { get; set; }
        decimal Close { get; set; }
        decimal Volume { get; set; }
}

//candles is a List<IOhlcv>
var candles = await importer.ImportAsync("FB");

What goes here?:

string[] x = from p in candles
             orderby p.DateTime ascending
             select What goes here?

I can get a List of Datetime like this also:

var sd = candles.Select(i => i.DateTime).ToList();

Is there a way to convert the List<DateTime> to a List<String> without looping?

I know I can do something like this but I am trying to avoid loops:

List<string> dateTimeStringList = new List<string>();

foreach (var d in candles)
    dateTimeStringList.Add(d.DateTime.ToString());

 return dateTimeStringList ;

Upvotes: 2

Views: 350

Answers (2)

Risto M
Risto M

Reputation: 2999

Is there a way to convert the List<DateTime> to a List<String> without looping?

This is how you can do it with Linq Select:

List<DateTime> list = new List<DateTime>();
list.Add(DateTime.Now);
var format = "yyyy MMMMM dd";
var stringList = list.Select(r => r.ToString(format)).ToList();

You can replace format above to your favorite DateTime format.

Upvotes: 1

KiraMiller
KiraMiller

Reputation: 179

What about this:

string[] x = from p in candles
         orderby p.DateTime ascending
         select p.DateTime.ToString()

You're right, that last one won't. I removed it.

Upvotes: 0

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