如何与字符串数组和字符串进行比较

Question

I want to compare one string with the string array because I need to match a phone number if it starts with some specific number then I need to do something.

Here is what I'm doing now. But I want to make this simpler.

string[] startNumList = new string[] {"4", "5", "6", "7", "8" };
foreach (string x in startNumList)
{
      if(request.ReferenceNumber.StartsWith(x))
       {
            //do something
       }
 }

I was jut wondering if this is possible to do the same with one line LINQ. Thanks in advance.

Answer 1

It's hard to give a definitive answer to this sort of question, but I'd go with this:

var matchingStartNumber = startNumList.FirstOrDefault(x => request.ReferenceNumber.StartsWith(x));
if (matchingStartNumber != null)
{
    // Do stuff with startNum
}

Answer 2

If you want to avoid the foreach loop you can use "Any" method from Linq to see if any items in your "startNumList" match the condition.

if(startNumList.Any(x => request.ReferenceNumber.StartsWith(x)))
{
                //do something
}