Checking if string contains one of the array values using C# .net

Question

i have string[] srt={"t","n","m"}

i need to know if the user input contain one of the values in str and print that value

i try this code but its not work with me

string str = Textbox.Text;
    string s = "";
    string[] a = {"m","t","n"};
        
        if (str.Contains(a.ToString()))
        {
            s = s + a;
        }

        else
        {
            s = s + "there is no match in the string";
        }

        Label1.Text = s;

The question is a bit confusing, because it seems to be the user input will be in `str`, so it seems you are trying to check if the user input contains something from `a`, correct? — Reticulated Spline, Feb 17 '15 at 05:15
possible duplicate of [Using C# to check if string contains a string in string array](http://stackoverflow.com/questions/2912476/using-c-sharp-to-check-if-string-contains-a-string-in-string-array) — शेखर, Feb 17 '15 at 05:16

Adil · Answer 1 · 2015-02-17T05:27:04.683

You need to search array for string value you have in str so

if (str.Contains(a.ToString()))

Would be

if(a.Contains(s))

Your code would be

if (a.Contains(str))
{
    s = s + "," + a;
}
else
{
     s = s + "there is no match in the string";
}

Label1.Text = s;

As a additional note you should use meaning full names instead of a, s.

You can also use conditional operator ?: to make it more simple.

string matchResult = a.Contains(s) ? "found" : "not found"

score 2 · Answer 2 · answered Feb 17 '15 at 05:15

Converting the array to a string isn't what is needed. If you don't care which character matched, use Any()

var s = a.Any(anA => str.Contains(anA))
    ? "There is a match"
    : "There is no match in the string";

And if you want the matches:

var matches = a.Where(anA => str.Contains(anA));
var s = matches.Any()
    ? "These Match: " + string.Join(",", matches)
    : "There is no match in the string";

score 1 · Answer 3 · edited May 23 '17 at 12:32

1

see Checking if a string array contains a value, and if so, getting its position You could use the Array.IndexOf method:

string[] stringArray = { "text1", "text2", "text3", "text4" };
string value = "text3";
int pos = Array.IndexOf(stringArray, value);
if (pos >- 1)
{
    // the array contains the string and the pos variable
    // will have its position in the array
}

edited May 23 '17 at 12:32

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answered Feb 17 '15 at 05:15

Jamaxack

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Checking if string contains one of the array values using C# .net

3 Answers3