gistfile1.cs

List<MyBaseClass> m_listOfObjects; // initialized somewhere else

public T FindFirstObjectOfType<T>() where T: MyBaseClass
{
  foreach(var toCheck in m_listOfObjects)
  {
    if(toCheck.getType() == typeof(T))
    {
      return toCheck as T;
    }
  }
}

public List<T> FindAllObjectsOfType<T>() where T: MyBaseClass
{
  var toReturn = new List<T>();
  foreach(var toCheck in m_listOfObjects)
  {
    if(toCheck.getType() == typeof(T))
    {
      toReturn.Add(toCheck as T);
    }
  }
  
  return toReturn;
}