How to find multiple values in array?

Question

My code below looks only for one letter, how can I look for combination of letters? For ex.: to find letters "ac" in my array and to output them to textBox2

string[] alphabet = new string[] { "a", "b", "c"};
for (int letter = 0; letter < alphabet.Length; letter++)
{
    if (textBox1.Text == alphabet[letter])
    textBox2.Text = alphabet[letter];
}

Do you want to check if all symbols in textBox1.Text are in the alphabet? — Andrei
– Andrei, Commented May 12, 2015 at 9:49
@LittleFox: what do you want to output? If all are in the string[], do you want to ouput the complete string[]? If so, what is the desired result? Mabye: string.Join(",", alphabet ) — Tim Schmelter
– Tim Schmelter, Commented May 12, 2015 at 9:54

Tim Schmelter · Accepted Answer · 2015-05-12 09:59:13Z

3

I guess you want to check if only letters of the array are entered in the textbox:

bool valid = textBox1.Text.All(c => alphabet.Contains(c.ToString()));

if it was a char[] you could write:

bool valid = textBox1.Text.All(alphabet.Contains);

Then you could also use Enumerable.Except to get the set difference:

var notValidLetters = textBox1.Text.Except(alphabet);
textBox2.Text = "Following are not valid letters: " + String.Join(", ", notValidLetters);

edited May 12, 2015 at 9:59

answered May 12, 2015 at 9:50

Tim Schmelter

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Comments

Dion V. · Accepted Answer · 2015-05-12 09:51:30Z

0

Considering your problem is "Find both a and c from the given string ac";

string[] alphabet = new string[] { "a", "b", "c"};
        for (int letter = 0; letter < alphabet.Length; letter++)
        {
            if (textBox1.Text.Any(alphabet[letter]))
                textBox2.Text += alphabet[letter];
        }

answered May 12, 2015 at 9:51

Dion V.

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