C# 判断两张图片是否一致的快速方法

#region 判断图片是否一致
/// <summary>
/// 判断图片是否一致
/// </summary>
/// <param name="img">图片一</param>
/// <param name="bmp">图片二</param>
/// <returns>是否一致</returns>
public bool IsSameImg(Bitmap img, Bitmap bmp)
{
//大小一致
if (img.Width == bmp.Width && img.Height == bmp.Height)
{
//将图片一锁定到内存
BitmapData imgData_i = img.LockBits(new Rectangle(0, 0, img.Width, img.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
IntPtr ipr_i = imgData_i.Scan0;
int length_i = imgData_i.Width * imgData_i.Height * 3;
byte[] imgValue_i = new byte[length_i];
Marshal.Copy(ipr_i, imgValue_i, 0, length_i);
img.UnlockBits(imgData_i);
//将图片二锁定到内存
BitmapData imgData_b = img.LockBits(new Rectangle(0, 0, img.Width, img.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
IntPtr ipr_b = imgData_b.Scan0;
int length_b = imgData_b.Width * imgData_b.Height * 3;
byte[] imgValue_b = new byte[length_b];
Marshal.Copy(ipr_b, imgValue_b, 0, length_b);
img.UnlockBits(imgData_b);
//长度不相同
if (length_i != length_b)
{
return false;
}
else
{
//循环判断值
for (int i = 0; i < length_i; i++)
{
//不一致
if (imgValue_i[i] != imgValue_b[i])
{
return false;
}
}
return true;
}
}
else
{
return false;
}
}
#endregion