C# how to add more punctuation marks to the String.Contains Method? [duplicate]

Question

This has been asked before in VB (apparently not satisfactory) but not in C#.

I need to add two punctuation marks to my String.Contains method (apart from the already existing "."), namely "!" and "?".

The idea is that the user finishes his/her input with a punctuation mark (i.e period, question mark or exclamation point). If they don't, the input will not be accepted in the text box.

 private void textBox1_TextChanged_1(object sender, EventArgs e)
        {
            
            if (textBox1.Text.Contains("."))
                
            {            
               Task.Delay(200).Wait();
                MessageBox.Show("Thanks for your input!");
            }

            else
            {
                return;
            }

How do I add these two? It seems impossible to add them as separate values...

If textBox1.Text is string type, why not just check if last char is . or ! or ?? — ochzhen
– ochzhen, Commented Nov 28, 2020 at 3:53
Posted an answer, please check if it what you are looking for — ochzhen
– ochzhen, Commented Nov 28, 2020 at 4:04

ochzhen · Accepted Answer · 2020-11-28 04:13:52Z

1

If we need to only check the last character, we can do this using EndsWith method:

private void textBox1_TextChanged_1(object sender, EventArgs e)
{
    var text = textBox1.Text;
    if (text.EndsWith(".") || text.EndsWith("!") || text.EndsWith("?"))
    {            
         Task.Delay(200).Wait();
         MessageBox.Show("Thanks for your input!");
    }
    else
    {
         return;
    }
}

https://learn.microsoft.com/en-us/dotnet/api/system.string.endswith?view=netcore-3.1

edited Nov 28, 2020 at 4:13

answered Nov 28, 2020 at 4:01

ochzhen

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6 Comments

Interestednewbie Over a year ago

Thanks, but I'm getting CS1503 error saying: Argument 1 cannot convert from char to string.....

ochzhen Over a year ago

I've corrected the answer to use string instead of char, please try it out ;)

Interestednewbie Over a year ago

Thank you very much! Seems to work smoothly now :-). Much appreciated.

ochzhen Over a year ago

Welcome! I'll appreciate if you accept this answer :)

Interestednewbie Over a year ago

Definitely the problem has been ccompletely solved.

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