Remove item from list by value

Question

I have a list of class objects and want to remove one item but it doesn´t work:

    class Person
    {
        public string name; 
        public Person(string s)
        {
            this.name = s;
        }
    }

    void ABC()
    {
        List<Person> newPersonList = new List<Person>();
        newPersonList.Add(new Person("A"));
        newPersonList.Add(new Person("B"));
        newPersonList.Add(new Person("C"));

        newPersonList.Remove(A);
        newPersonList.RemoveAt(1);
    }

RemoveAt(1) works and deletes item with the ID 1.

I think Remove(A) should delete the item with the value "A". But this is not working. Can someone explain why? And what is the right way to delete by value?

Answer 1

Easiest way to remove from list by element's property value:

newPersonList.RemoveAll(p => p.name == "A");

Nicer way would be to change Person like that:

class Person : IEquatable<Person>
{
    public readonly string Name;
    public Person(string name)
    {
        if (string.IsNullOrWhiteSpace(name))
            throw new ArgumentException("name");
        Name = name;
    }
    public static implicit operator string(Person p)
    {
        return p.Name;
    }
    public static implicit operator Person(string name)
    {
        return new Person(name);
    }
    public bool Equals(Person other)
    {
        return Name.Equals(other.Name);
    }
}

And then use it like that:

var newPersonList = new List<Person>
{
    new Person("A"),
    new Person("B"),
    new Person("C")
};
newPersonList.Remove("A");

Or even like that:

var newPersonList = new List<Person> { "A", "B", "C" };
newPersonList.Remove(new Person("A"));