String Arrays in c#. Removing elements from one string array which are their in another string array

Question

I have two string arrays -

            string[] One = new string[3];

            One[0] = "Pen";          
            One[1] = "Pencil";          
            One[2] = "card";

and,

            string[] Two = new string[2];

            Two[0] = "card";          
            Two[1] = "drive";

Now, I want a new string array from these two, such that the final result does not contain any element of the Two array. i.e. it should have, "Pen", "Pencil" only.

Like Union method in c#, is there any similar method which can be used here ?? — Vishwas Joshi
– Vishwas Joshi, Commented Feb 2, 2020 at 10:41
Yes, you can use linq Except method. One.Except(Two).ToArray() — Lior
– Lior, Commented Feb 2, 2020 at 11:05
Does this answer your question? How to perform set subtraction on arrays in C#? — SᴇM
– SᴇM, Commented Feb 2, 2020 at 11:13

Pashupati Khanal · Accepted Answer · 2020-02-04 05:07:35Z

5

This simple linq query can give you result.

var res = One.Except(Two);

Further, if in case you need to ignore case, use overload version of above method as:

var res = One.Except(Two, StringComparer.OrdinalIgnoreCase);

OR, Equivalently.

var res  = One.Where(x=>!Two.Contains(x)).ToArray();

edited Feb 4, 2020 at 5:07

answered Feb 2, 2020 at 10:50

Pashupati Khanal

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2 Comments

Surendra Shrestha Over a year ago

This is one of the easy way using linq. If you want to ignore case, then you can use the overloaded method: "One.Except(Two, StringComparer.OrdinalIgnoreCase)"

Pashupati Khanal Over a year ago

Thanks for your ans I will Update It as well.

Dan T. · Accepted Answer · 2020-02-02 10:43:39Z

4

You can use Linq -

var res = One.Where(x => Two.Find(x) == null);

Or even better:

        string[] One = new string[3];

        One[0] = "Pen";
        One[1] = "Pencil";
        One[2] = "card";
        string[] Two = new string[2];

        Two[0] = "card";
        Two[1] = "drive";

        var res = One.Except(Two);

answered Feb 2, 2020 at 10:43

Dan T.

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Comments

Athanasios Kataras · Accepted Answer · 2020-02-02 10:53:26Z

1

You need something like non-intersect

         string[] One = new string[3];

            One[0] = "Pen";          
            One[1] = "Pencil";          
            One[2] = "card";

        string[] Two = new string[2];

            Two[0] = "card";          
            Two[1] = "drive";

        var nonintersectOne = One.Except(Two);   
        foreach(var str in  nonintersectOne)
           Console.WriteLine(str);

        // Or if you want the non intersect from both
        var nonintersectBoth = One.Except(Two).Union(Two.Except(One)).ToArray();
        foreach(var str in  nonintersect)
           Console.WriteLine(str);

Output 1:

Pen

Pencil

Output 2:

Pen

Pencil

drive

edited Feb 2, 2020 at 10:53

answered Feb 2, 2020 at 10:46

Athanasios Kataras

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2 Comments

Athanasios Kataras Over a year ago

Quite right, updated accordingly. Leaving the secondary solution for anyone who might want it.

Enigmativity Over a year ago

Please don't make the answer confusing by adding in superfluous content.

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