小编Moh*_*mad的帖子

if ((a & b) == b)以下代码块中的含义是什么？

if ((e.Modifiers & Keys.Shift) == Keys.Shift)
{
    lbl.Text += "\n" + "Shift was held down.";
}

为什么不是这样的？

if (e.Modifiers == Keys.Shift)
{
    lbl.Text += "\n" + "Shift was held down.";
}