Check if KeyValuePair exists with LINQ's FirstOrDefault

Question

I have a dictionary of type

Dictionary

I want to return the first instance where a condition is met using

var         


        

Answer 1

What you want is an Any method that gives you the matching element as well. You can easily write this method yourself.

public static class IEnumerableExtensions
{
  public static bool TryGetFirst(this IEnumerable source,
                                          Func predicate,
                                          out TSource first)
  {
    foreach (TSource item in source)
    {
      if (predicate(item))
      {
        first = item;
        return true;
      }
    }

    first = default(TSource);
    return false;
  }
}