Complete if statement with strings and array of strings

Question

I have a page that has 3 variables. They look like this:

String[] Headers = new String[] { "Max Width", "Max Length", "Max Height" };
String currentHeader = (String)HttpContext.Current.Request.QueryString["ItemHas"] ?? "";
String checkString = (String)HttpContext.Current.Request.QueryString["ItemIn"] ?? "";

The checkString is a list of Headers delimited by a "|".

What is the easiest way to check if my currentHeader is in my Headers array and in my checkString String? I can do it but not in less than 20 lines of code. That seems like a less than optimal solution.

Answer 1

if (!string.IsNullOrEmpty(currentHeader) && Headers.Contains(currentHeader) && checkString.Split('|').Contains(currentHeader))

Answer 2

checkString.Split('|').Contains(currentHeader) && Headers.Contains(currentHeader)

Using LINQ. Did I misunderstand something?

Answer 3

Write a quick utility method:

private bool IsInHeader(string[] _headers, string _findme)
{
    if (_headers == null || _findme == null) return false;
    foreach (string s in _headers)
    {
        if (_findme == s) return true;
    }
    return false;
}

Answer 4

Try this:

if (Headers.Contains(currentHeader) && checkString.Split('|').Contains(currentHeader)) {
    ....
}

And if you need it to be case-insensitive:

if (Headers.Contains(currentHeader, StringComparer.InvariantCultureIgnoreCase) 
    && checkString.Split('|').Contains(currentHeader, StringComparer.InvariantCultureIgnoreCase) {
    ....
}

Answer 5

Perhaps I am misunderstanding the question, but this should work:

var checks = checkString.Split('|');
if ( currentHeader.Contains(checkString) && Headers.Contains(checkString) )
{
   ....
}