数据库存取图片（只是自己学习的记录不保证正确性）

第一步：//获取当前选择的图片
this.pictureBox1.Image = Image.FromStream(this.openFileDialog1.OpenFile());
//获取当前图片的路径
string path = openFileDialog1.FileName.ToString();
//将制定路径的图片添加到FileStream类中
FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
//通过FileStream对象实例化BinaryReader对象
BinaryReader br = new BinaryReader(fs);
//通过BinaryReader类对象的ReadBytes()方法将FileStream类对象转化为二进制数组
byte[] imgBytesIn = br.ReadBytes(Convert.ToInt32(fs.Length));第二步：//将图片添加到数据库中
string sql="insert into pic values(@pic)";
SqlParameter[] param = new SqlParameter[] { new SqlParameter("@pic", imgBytesIn) };
DBHelper.GetExecuteQuery(sql, param);第三步：//将图片从数据库中取出
string sql="select * from pic where id=0";
SqlDataReader reader = DBHelper.GetExecuteReader(sql, null);
MemoryStream mss = null;

参考下面三篇，如果不会也没有什么好说了：
http://www.cnblogs.com/insus/p/4620420.html
http://www.cnblogs.com/insus/p/4623507.html
http://www.cnblogs.com/insus/p/4632889.html