将一些C位操作转换并解释为C#

我也不理解位操作中发生的一切.

inline void SetBits(unsigned long& aValue,unsigned int aData,unsigned int aPosition,unsigned int aLength)
{
    unsigned int datamask;   // data mask,before aPosition shift

    if (aLength == 32)
        datamask = 0xFFFFFFFF;
    else
        datamask = (1L << aLength) - 1;

    aValue &= ~(datamask << aPosition);             // Clear bits
    aValue |= (aData & datamask) << aPosition;      // Set value
}

我在C#版本中收到此错误：

Error Operator ‘<<‘ cannot be applied to operands of type ‘long’ and ‘uint’

Error Operator ‘<<‘ cannot be applied to operands of type ‘uint’ and ‘uint’

编辑：

我认为这个解决方案没问题：

private void SetBits(ref uint value,uint data,int position,int length)
    {
        uint datamask;   // data mask,before position shift

        if (length >= 32)
            datamask = 0xFFFFFFFF;
        else
            datamask = ((uint)1 << length) - 1;

        value &= ~(datamask << position);             // Clear bits
        value |= (data & datamask) << position;      // Set value
    }