图片附件写入SQL和从SQL读取输出

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.Data;
using System.Data.SqlClient;
using System.IO;

namespace imgStream
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnUpload_Click(object sender, EventArgs e)
        {
            //上传图片到数据库
            OpenFileDialog openDlg = new OpenFileDialog();
            openDlg.Filter = "图片文件(*.jpg)|*.jpg";

            string filePath = "";
            if (openDlg.ShowDialog() == DialogResult.OK)
            {
                filePath = openDlg.FileName;
                this.txtFilePath.Text = filePath;
                this.picShow.ImageLocation = filePath;

                //打开文件流，用来读取图片文件中的数据
                FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);

                //将文件流中的数据存入内存字节组中
                byte[] buffer = new byte[stream.Length];
                stream.Read(buffer, 0, (int)stream.Length);

                stream.Close();

                try
                {
                    //调用存储图片数据的存取过程
                    string strName = Path.GetFileName(filePath);
                    string connString = @"Data Source=***SQLEXPRESS;Initial Catalog=newssystem;Persist Security Info=True;User ID=sa;Password=***";
                    SqlConnection conn = new SqlConnection(connString);
                    conn.Open();
                    SqlCommand cmd = new SqlCommand("proc_UploadPicture", conn);
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.Add("@ID", SqlDbType.Int).Value = 1;
                    cmd.Parameters.Add("@Age", SqlDbType.Int).Value = 2016;
                    cmd.Parameters.Add("@Picture", SqlDbType.Image).Value = buffer;
                    cmd.Parameters.Add("@Hobby", SqlDbType.VarChar).Value = strName;
                    cmd.ExecuteNonQuery();

                    conn.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        private void clear_Click(object sender, EventArgs e)
        {
            this.picShow.ImageLocation = "";
            this.txtFilePath.Text = "";
        }

        private void btnDownload_Click(object sender, EventArgs e)
        {
            //将数据库中的图片显示出来
            try
            {
                byte[] imageBytes;
                String strName;
                string connString = @"Data Source=***SQLEXPRESS;Initial Catalog=newssystem;Persist Security Info=True;User ID=sa;Password=***";
                SqlConnection conn = new SqlConnection(connString);

                conn.Open();

                SqlCommand cmd = new SqlCommand("proc_DownloadPicture", conn);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add("@ID", SqlDbType.Int).Value = 24;

                SqlDataReader dataReader = cmd.ExecuteReader();

                if (dataReader.Read())
                {
                    //获取图片数据
                    imageBytes = (byte[])dataReader["Picture"];
                    strName = (String)dataReader["Hobby"];
                    //将内存流格式化为位图
                    MemoryStream stream = new MemoryStream(imageBytes);
                    Bitmap bmap = new Bitmap(stream);

                    stream.Close();

                    //将位图显示在界面的PictureBox控件中
                    this.picShow.Image = bmap;
                    this.txtFilePath.Text = strName;
                }

                dataReader.Close();
                conn.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }


    }
}

应老板要求，写一个SQL输入和输出图片，PDF等附件，不从目录写入和读取，所以只能另外想办法了。

网上找了下方法，加工下，可以暂时实现这个功能，另外需要转化为Web Service，再程序调用。