Split string and convert to nullable long

Question

I have the following code which splits a string and then convert the values to long:

string.IsNullOrEmpty(baIds) ? null : baIds.Split(',').Select(e => long.Parse(e)).ToList(),

What I want is to convert the values to nullable long instead. Any help pls?

This seems like an XY problem, why do you need nullable longs in the first place? — DavidG, Mar 08 '19 at 10:54
If I am understanding you right you could instead of returning `null` try returning `default(long?)` — nbokmans, Mar 08 '19 at 10:55
Possible duplicate (but with int) https://stackoverflow.com/a/45037/5295849 — Quentin S., Mar 08 '19 at 10:56
Possible duplicate of [How to parse a string into a nullable int](https://stackoverflow.com/questions/45030/how-to-parse-a-string-into-a-nullable-int) — Dmitry Pavliv, Mar 08 '19 at 11:03

Jon Hanna · Answer 1 · 2019-03-08T11:17:10.213

1

If you just need it to be typed as long? then just cast in the Select

Select(e => (long?)long.Parse(e))

If you need to use null to indicate something that couldn't be parsed as long then

Select(e => long.TryParse(e, out long r) ? r : default(long?))

edited Mar 08 '19 at 11:17

answered Mar 08 '19 at 11:10

Jon Hanna

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fubo · Accepted Answer · 2019-03-08T10:58:53.290

0

Use TryParse

List<long?> result = null;
if (!string.IsNullOrEmpty(baIds))
{
    long temp;
    result = baIds.Split(',').Select(e => long.TryParse(e, out temp) ? temp : (long?)null).ToList();
}

https://dotnetfiddle.net/uHk99J

edited Mar 08 '19 at 10:58

answered Mar 08 '19 at 10:56

fubo

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I would remove the `long temp;` line and use `out var temp` instead. But I'm still not convinced OP even needs to do this. – DavidG Mar 08 '19 at 10:57

score 0 · Answer 3 · answered Mar 08 '19 at 10:58

0

You can use this,

string.IsNullOrEmpty(baIds) ? null : baIds.Split(',').Select(e => (long?)long.Parse(e)).ToList(),

answered Mar 08 '19 at 10:58

Murat Acarsoy

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Split string and convert to nullable long

3 Answers3