List Index Search

Question

I have a List item

List xmlValue = new List();

In this I have Item {\"English\",\"Spanish\",\"French\",\

Answer 1

List<string> xmlValue = new List<string>() 
                 {"English", "Spanish", "French", "Hindi", "English", "English"};

string search = "English";

int[] result = xmlValue.Select((b, i) => b.Equals(search) ? i : -1)
                       .Where(i => i != -1).ToArray();

Answer 2

I'd opt against using the LINQ extension methods in this case and use an "old-fashioned" loop:

string search = "English";

var foundIndices = new List<int>(xmlValue.Count);
for (int i = 0; i < xmlValue.Count; i++) {
    if (xmlValue[i] == search) {
        foundIndices.Add(i);
    }
}

It's simply more readable like this in my opinion; also, the foundIndices list never holds any unwanted values.