Checking if a string array contains a value, and if so, getting its position

Question

I have this string array:

string[] stringArray = { \"text1\", \"text2\", \"text3\", \"text4\" };
string value = \"text3\";

I would like to

Answer 1

you can try like this...you can use Array.IndexOf() , if you want to know the position also

       string [] arr = {"One","Two","Three"};
       var target = "One";
       var results = Array.FindAll(arr, s => s.Equals(target));

Answer 2

string[] strArray = { "text1", "text2", "text3", "text4" };
string value = "text3";

if(Array.contains(strArray , value))
{
    // Do something if the value is available in Array.
}

Answer 3

I created an extension method for re-use.

   public static bool InArray(this string str, string[] values)
    {
        if (Array.IndexOf(values, str) > -1)
            return true;

        return false;
    }

How to call it:

string[] stringArray = { "text1", "text2", "text3", "text4" };
string value = "text3";
if(value.InArray(stringArray))
{
  //do something
}

Answer 4

var index = Array.FindIndex(stringArray, x => x == value)

Answer 5

string x ="Hi ,World";
string y = x;
char[] whitespace = new char[]{ ' ',\t'};          
string[] fooArray = y.Split(whitespace);  // now you have an array of 3 strings
y = String.Join(" ", fooArray);
string[] target = { "Hi", "World", "VW_Slep" };

for (int i = 0; i < target.Length; i++)
{
    string v = target[i];
    string results = Array.Find(fooArray, element => element.StartsWith(v, StringComparison.Ordinal));
    //
    if (results != null)
    { MessageBox.Show(results); }

}

Answer 6

EDIT: I hadn't noticed you needed the position as well. You can't use IndexOf directly on a value of an array type, because it's implemented explicitly. However, you can use:

IList<string> arrayAsList = (IList<string>) stringArray;
int index = arrayAsList.IndexOf(value);
if (index != -1)
{
    ...
}

(This is similar to calling Array.IndexOf as per Darin's answer - just an alternative approach. It's not clear to me why IList<T>.IndexOf is implemented explicitly in arrays, but never mind...)