c# - ValueTypes 数组不喜欢 object.Equals？

Question

这让我抓狂了好几天:

byte[] _A = new byte[64];
// Fill _A with some meaningful, valid data.

byte[] _B = new byte[_A.Length];
_A.CopyTo( _B, 0 );

if( !_A.Equals( _B ) ) {
    throw new WtfException(
        "It appears object.Equals doesn't work on arrays of value types...");
}

是的，这会抛出 WtfException。我花了几天时间才注意到。 byte 是一个 ValueType。但是，byte[] 是一个 System.Array，它是一个引用类型。根据 .NET 文档:

The default implementation of Equals supports reference equality for reference types, and bitwise equality for value types. Reference equality means the object references that are compared refer to the same object. Bitwise equality means the objects that are compared have the same binary representation.

有人可以帮忙吗？

Answer 1

您比较的是引用类型(数组)而不是值类型。 _A 和 _B 确实不同 - 它们是两个不同的数组，但恰好包含相同的值。