GetHashCode 使用派生类的元组实现

Question

我喜欢使用元组来实现 GetHashCode，如 https://intellitect.com/overidingobjectusingtuple/ 所述。但是，这似乎不适用于派生类。例如：

class Base
{
    public int Prop1 { get; set; }
    public int Prop2 { get; set; }

    public override int GetHashCode() => (Prop1, Prop2).GetHashCode();
}

class Derived : Base
{
    public int Prop3 { get; set; }
    public int Prop4 { get; set; }

    public override int GetHashCode() => (Prop3, Prop4, ???).GetHashCode();
}

目前还不清楚我将如何使用元组实现 Derived GetHashCode。有什么建议么？我们目前正在这样做，但我很想摆脱未经检查的哈希常量：

public override int GetHashCode()
{
    unchecked
    {
        return (base.GetHashCode() * HashCodeConstant) ^ (Prop3, Prop4).GetHashCode();
    }
}

Answer 1

见https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/ide0070

public override int GetHashCode()
{
    return System.HashCode.Combine(base.GetHashCode(), Prop3, Prop4);
}