Remove Item in Dictionary based on Value

Question

I have a Dictionary.

I need to look within that dictionary to see if a value exists based on input from somewhere else and if it e

Answer 1

Dictionary source
//
//functional programming - do not modify state - only create new state
Dictionary result = source
  .Where(kvp => string.Compare(kvp.Value, "two", true) != 0)
  .ToDictionary(kvp => kvp.Key, kvp => kvp.Value)
//
// or you could modify state
List keys = source
  .Where(kvp => string.Compare(kvp.Value, "two", true) == 0)
  .Select(kvp => kvp.Key)
  .ToList();

foreach(string theKey in keys)
{
  source.Remove(theKey);
}