How to simplify an if condition having multiple OR cases [closed]

Answer 1

Use an extension method:

public static bool ContainsAny(this string self, params string[] criteria)
{
    foreach (string s in criteria)
    {
        if (self.Contains(s))
        {
            return true;
        }
    }
    return false;
}

call it like this:

if (myString.ContainsAny("UCK", "SAN", "AVB", "AVM", "SDS", "DWW", "WQP", "LHG"))
{
    mySecondString = "CATEGORY A";
}

else if (myString.ContainsAny("UCT", "SAM", "AHJB", "AVR"))
{
    mySecondString = "CATEGORY B";
}

else if (myString.ContainsAny("UKC", "SHZ", "EEB"))
{
    mySecondString = "CATEGORY C";
}

else
{
    mySecondString = "CATEGORY D";
}