How to impelement GetHashCode in class without any ID

This question already has an answer here:

What is the best algorithm for an overridden System.Object.GetHashCode? 17 answers

Implementing GetHashCode correctly [duplicate] 1 answer

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您应该将您的对象的哈希码计算基于不可变字段，如果您可以使Person的FirstName和LastName字段不可变，则可以使用基于Josh Bloch建议的以下模式：

public override int GetHashCode()
{
    int hash = 17;
    hash = hash * 31 + FirstName.GetHashCode();
    hash = hash * 31 + LastName.GetHashCode();
    return hash;
}

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public override int GetHashCode()
    {
        return String.Concat(FirstName, LastName).GetHashCode();
    }

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You can do something like this:

public override int GetHashCode()
{
    return FirstName.GetHashCode() ^ LastName.GetHashCode()
}

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