https://www.cnblogs.com/allenlooplee/archive/2004/12/25/81917.html
p/invoke这类需要熟悉

C语言的位域C#没法转换，不过可以换个思路用属性来模拟

public struct _USB_PROTOCOLS
{
    public UInt32 ul;

    public UInt32 Usb110
    {
        get => ul & 0x80000000;
        set => ul = (ul & 0x7FFFFFFF) | (value << 31);
    }

    public UInt32 Usb200
    {
        get => Usb110;
        set => Usb110 = value;
    }

    public UInt32 Usb300
    {
        get => Usb110;
        set => Usb110 = value;
    }

    public UInt32 ReservedMBZ
    {
        get => ul & 0x7FFFFFFF;
        set => ul = (ul & 0x80000000) | (value & 0x7FFFFFFF);
    }
}