Convert String To Nullable Integer List

Question

I'm wanting to parse a string into a nullable int list in C#

I'm able to convert it to int list bit not a nullable one

string data = "1,2";
List<int> TagIds = data.Split(',').Select(int.Parse).ToList();

say when data will be empty i want to handle that part!

Thanks

Community · Accepted Answer · 2017-05-23 12:30:04Z

4

You can use following extension method:

public static int? TryGetInt32(this string item)
{
    int i;
    bool success = int.TryParse(item, out i);
    return success ? (int?)i : (int?)null;
}

Then it's simple:

List<int?> TagIds = data.Split(',')
    .Select(s => s.TryGetInt32())
    .ToList();

I use that extension method always in LINQ queries if the format can be invalid, it's better than using a local variable and int.TryParse (E. Lippert gave an example, follow link).

Apart from that it may be better to use data.Split(new[]{','}, StringSplitOptions.RemoveEmptyEntries) instead which omits empty strings in the first place.

edited May 23, 2017 at 12:30

CommunityBot

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answered May 13, 2015 at 13:17

Tim Schmelter

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2 Comments

Ifeoluwa Osungade Over a year ago

Is it possible to do this without an extension method?

Tim Schmelter Over a year ago

@IfeoluwaOsungade: You can call every extension method as a normal static method(ClassName.MethodName).

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