How to filter strings from an array of objects

Question

I have an array of objects like this:

 object[] test = {
        "Rock Parrot",
        "Crimson Rosella",
        "Regent Parrot",
        "Superb Parrot",
        "Red Lory",
        "African Emerald Cuckoo",
        1,2,3


};

How do i filter this array and get only an array of strings.

Thanks

Blorgbeard · Accepted Answer · 2017-02-08 23:54:45Z

6

You can do this:

var stringsOnly = test.OfType<String>().ToArray()

edited Feb 8, 2017 at 23:54

answered Feb 8, 2017 at 23:49

Blorgbeard

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3 Comments

Codeacula Over a year ago

This doesn't work for me. Could it be because OfType is missing parenthesis?

Harobed Over a year ago

thats great @Blorgbeard ... i also tried this var stringOnly= Array.FindAll(test, x => x is string); which one do you think is better on resources.

Blorgbeard Over a year ago

I imagine that practically speaking both are "fast enough". If you are concerned, I suggest you race your horses :P

Hossein Golshani · Accepted Answer · 2017-02-09 09:46:00Z

1

string[] stringArray = test.Where(element => element is string).Cast<string>().ToArray();

edited Feb 9, 2017 at 9:46

answered Feb 9, 2017 at 0:08

Hossein Golshani

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2 Comments

JimHawkins Over a year ago

Welcome to stack overflow :-) Please look at How to Answer. You should provide some information why your code solves the problem. Code-only answers aren't useful for the community.

Hossein Golshani Over a year ago

Thanks Blorgbeard - fixed

Abion47 · Accepted Answer · 2017-02-09 00:02:40Z

0

You can do:

object[] test = {
        "Rock Parrot",
        "Crimson Rosella",
        "Regent Parrot",
        "Superb Parrot",
        "Red Lory",
        "African Emerald Cuckoo",
        1,2,3};

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

foreach (var item in test)
{

    if (typeof(string) == item.GetType())
        s.Add(item.ToString());
}

If you run this code the response:

Rock Parrot
Crimson Rosella
Regent Parrot
Superb Parrot
Red Lory
African Emerald Cuckoo

You can convert to array :

var a = s.ToArray();

edited Feb 9, 2017 at 0:02

Abion47

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answered Feb 9, 2017 at 0:00

Eduardo Antonio Bortolini

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1 Comment

Blorgbeard Over a year ago

This will crash if there are any null values in the array.

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