c# - 多头的按位运算

Question

我试图编译这段代码:

Int64 itag = BitConverter.ToInt64(temp, 0);
itag &= 0xFFFFFFFFFFFFFC00;

但是这给了我以下错误:

Operator '&=' cannot be applied to operands of type 'long' and 'ulong'

我该怎么做？

Answer 1

参见 http://msdn.microsoft.com/en-en/library/aa664674%28v=vs.71%29.aspx .

If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.

你有

0xFFFFFFFFFFFFFC00

但是 Int64.Max 是:

0x7FFFFFFFFFFFFFFF

所以long不够大，ulong作为字面量的类型。

现在您在左侧有一个 Int64，它已签名，在右侧您有 ulong，但是， 没有重载&= 接受导致错误的组合。