using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Drawing.Imaging;using System.Runtime.InteropServices;namespace WindowsFormsApplication2{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void LockUnlockBitsExample(PaintEventArgs e)        {            //Create a new bitmap            Bitmap bmp = new Bitmap("house.jpg");            //Lock the bitmap‘s bits            Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);            BitmapData bmpData = bmp.LockBits(rect, ImageLockMode.ReadWrite, bmp.PixelFormat);            //Get the address of the fist line            IntPtr ptr = bmpData.Scan0;            //Declare an array to hold the bytes of the bitmap            int bytes = Math.Abs(bmpData.Stride) * bmp.Height;            byte[] rgbValues = new byte[bytes];            //Copy the RGB values into the array            Marshal.Copy(ptr, rgbValues, 0, bytes);            //Set every third value to 255. A 24bpp bitmap will look red            //bitmap图像是BGR的方式存储的。            for (int counter = 1; counter < rgbValues.Length; counter += 3)            {                rgbValues[counter] = 255;            }            //Copy the RGB values back to the bitmap            Marshal.Copy(rgbValues, 0, ptr, bytes);            //Unlock the bits            bmp.UnlockBits(bmpData);            //Draw the modified image            e.Graphics.DrawImage(bmp, 0, 150);        }        private void Form1_Paint(object sender, PaintEventArgs e)        {            LockUnlockBitsExample(e);        }    }}