Bootstrap

把图片转换成二进制--把二进制转换成图片

把图片转换成二进制--把二进制转换成图片
private void button1_Click( object sender, EventArgs e)
         {
             string path = this .textBox1.Text;
             byte [] imgBytesIn = SaveImage(path);
             ShowImgByByte(imgBytesIn);
             //Parameters.Add("@Photo", SqlDbType.Binary).Value = imgBytesIn;
            
         }
         //将图片以二进制流
         public byte [] SaveImage(String path)
         {           
             FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read); //将图片以文件流的形式进行保存
             BinaryReader br = new BinaryReader(fs);
             byte [] imgBytesIn = br.ReadBytes(( int )fs.Length);  //将流读入到字节数组中
             return imgBytesIn;
         }
         //现实二进制流代表的图片
         public void ShowImgByByte( byte [] imgBytesIn)
         {
             MemoryStream ms = new MemoryStream(imgBytesIn);
             pictureBox1.Image = Image.FromStream(ms);
         }
 
二、将图片保存到数据库中,并从数据库中读取:
#region 将图片从数据库中读取
         /// <summary>
         /// 将图片从数据库中读取
         /// </summary>
         /// <param name="xs_ID">要读取图片的学号</param>
         /// <param name="ph">pictureBox1控件名</param>
         public void get_photo( string xs_ID, PictureBox ph) //将图片从数据库中读取
         {
             byte [] imagebytes = null ;
             getcon();
             SqlCommand con = new SqlCommand( "select * from S_jiben where S_num='" + xs_ID + "'" , link);
             SqlDataReader dr = con.ExecuteReader();
             while (dr.Read())
             {
                 imagebytes =( byte [])dr.GetValue(18);
             }
             dr.Close();
             con_close();
             MemoryStream ms = new MemoryStream(imagebytes);
             Bitmap bmpt = new Bitmap(ms);
             ph.Image = bmpt;
         }
         #endregion
         #region
         public void SaveImage( string MID, OpenFileDialog openF) //将图片以二进制存入数据库中
         {
             string strimg = openF.FileName.ToString();  //记录图片的所在路径
             FileStream fs = new FileStream(strimg, FileMode.Open, FileAccess.Read); //将图片以文件流的形式进行保存
             BinaryReader br = new BinaryReader(fs);
             byte [] imgBytesIn = br.ReadBytes(( int )fs.Length);  //将流读入到字节数组中
             getcon();
             StringBuilder strSql = new StringBuilder();
             strSql.Append( "update S_jiben Set xs_photo=@Photo where S_num=" + MID);
             SqlCommand cmd = new SqlCommand(strSql.ToString(), link);
             cmd.Parameters.Add( "@Photo" , SqlDbType.Binary).Value = imgBytesIn;
             cmd.ExecuteNonQuery();
             con_close();
         }
         #endregion
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