令人惊讶的元组(不)等式

Surprising Tuple (in)equality(令人惊讶的元组(不)等式)

问题描述

直到今天，我对 .NET Tuple 类的理解是它们将 Equals() 的实现委托给它们的内容，让我可以对它们进行等同和比较按价值".

Until today, my understanding of .NET Tuple classes had been that they delegate their implementation of Equals() to their contents, allowing me to equate and compare them "by value".

然后这个测试出现了，把我弄傻了:

Then this test came along and made a fool out of me:

[TestMethod]
public void EquateTwoTuplesWithSameContent()
{
    var t1 = Tuple.Create("S");
    var t2 = Tuple.Create((object)t1.Item1);
    Assert.IsTrue(t1.Equals(t2)); // Boom!
}

阅读 MSDN 文档和各种博客给我留下了更多问题.从我的收集来看，似乎 Tuple