C＃int字节转换 [英] C# int byte conversion

问题描述

为什么

byte someVar;
someVar -= 3; 

有效，但

byte someVar;
someVar = someVar - 3;

不是吗？

推荐答案

令人惊讶的是，当你对字节执行操作时，计算将使用 int 值完成，字节隐式转换为（int ）首先。这对于短也是如此，同样 float s被上转换为执行浮点运算时双倍。

Surprisingly, when you perform operations on bytes the computations will be done using int values, with the bytes implicitly cast to (int) first. This is true for shorts as well, and similarly floats are up-converted to double when doing floating-point arithmetic.

第二个代码段相当于：

byte someVar;
someVar = (int) someVar - 3;

因此你必须将结果强制转换回（byte）让编译器接受赋值。

Because of this you must cast the result back to (byte) to get the compiler to accept the assignment.

someVar = (byte) (someVar - 3);

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