test if string value is contained in array of strings

Question

Hi I have a list of words which i am looking for if this word is found i want the valuye removed from my array

private static string[] WordList = { "Example No", "Name", "Client ID"};

var listToTest = new[] { "ME 0.3", "Example No.: 1243", "Name.:"};

var newList= new List<string>();
foreach (var value in listToTest)
{
    if (!WordList.Any(x => x.Contains(value)))
    {
        newList.Add(value);
    }
 }

return newList.ToArray();

my test returns all the value where I only want it to return "ME 0.3"

Answer 1

.WordList.Any(x => x.Contains(value)) will return true if no element in WordList contains value and false if there is at least one element in WordList that contains value .

So your code will return an array of elements of listToTest , that no element in WordList contains them, but as you said you want an array of elements of listToTest that they contain no element of WordList . So in ... x.Contains(value))) replace x and value with each other:

private static string[] WordList = { "Example No", "Name", "Client ID"};

var listToTest = new[] { "ME 0.3", "Example No.: 1243", "Name.:"};

var newList= new List<string>();
foreach (var value in listToTest)
{
    if (!WordList.Any(x => value.Contains(x)))
    {
        newList.Add(value);
    }
 }

return newList.ToArray();

By the way there is a neater way:

var result = listToTest.Where(x => !WordList.Any(y => x.Contains(y))).ToArray();

// Usage:
foreach (var s in result)
    Console.WriteLine(s);

// Output:
// ME 0.3

Description:

• Enumerable.Where Method: Filters a sequence of values based on a predicate.
• Enumerable.Any Method: Determines whether any element of a sequence exists or satisfies a condition.
• Enumerable.ToArray Method: Creates an array from a IEnumerable.
• String.Contains(String) Method: Returns a value indicating whether a specified substring occurs within this string.

Answer 2

Not the most efficient, but works.

  newList = listToTest.Where((x) =>
  {
      return WordList.Where(x2 => x.IndexOf(x2) != -1).Count() == 0;
  }).ToList();