c# - 对于引用类型，使用 IEquatable 如何减少转换的使用？

Question

我读过几篇文章

使用 IEquatable 的引用类型减少了转换的使用

谁能提供一个有说服力的例子。

Answer 1

只是在Dario's explanation 之后添加一个简单的示例:

class Person : IEquatable<Person>
{
    public string Name { get; set; }

    public override bool Equals(object obj)
    {
        if (obj is Person)
        {
            Person other = (Person)obj;
            // check equality
        }
        return base.Equals(obj);
    }

    #region IEquatable<Person> Members

    public bool Equals(Person other)
    {
        // check equality without cast
    }

    #endregion
}

注意:这只是一个小片段，说明了为什么这避免了 cast。为了正确实现，请检查 docs :

If you implement IEquatable<(Of <(T>)>), you should also override the base class implementations of Object..::.Equals(Object) and GetHashCode so that their behavior is consistent with that of the IEquatable<(Of <(T>)>)..::.Equals method