很奇怪：图片锁定内存储器中，LockBitsc参数无效

很奇怪：图片锁定内存中，LockBitsc参数无效

C# code

public static unsafe double m0000ee(Bitmap A_0, Bitmap A_1)    {        if ((A_0 == null) || (A_1 == null))        {            return 0.0;        }       BitmapData bitmapdata = A_0.LockBits(new Rectangle(0, 0, A_0.Width, A_0.Height), //报错ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);        BitmapData data2 = A_1.LockBits(new Rectangle(0, 0, A_1.Width, A_1.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);.............}