C#(WinForm)上传图片保存到数据库和从数据库读取图片显示到窗体

 //浏览图片

         private void btnUp_Click(object sender, EventArgs e)

         {

             OpenFileDialog ofd = new OpenFileDialog();

             ofd.Title = "选择要上传的图片";

             ofd.Filter = "All Files(*.*)|*.*|位图(*.bmp)|*.bmp|JPEG(*.jpg)|*.jpg";

             ofd.ShowDialog();

             textBox1.Text = ofd.FileName;

             if (!File.Exists(ofd.FileName))

             {

                 MessageBox.Show("照片为空");

                 return;

             }

         }

         //上传保存到数据库

         private void btnUpLoad_Click(object sender, EventArgs e)

         {

             string strPath = txtbImage.Text.Trim();

             FileStream fs = new FileStream(strPath, FileMode.Open, FileAccess.Read);

             byte[] byteFile = new byte[fs.Length];

             fs.Read(byteFile, , (int)fs.Length);

             fs.Close();

             SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True");

                 try

                 {

                     SqlCommand cmd = new SqlCommand();

                     cmd.Connection = conn;

                     string strSql = "insert into test(FileName,Img) Values(@FileName,@Img)";

                     cmd.CommandText =strSql ;

                     //cmd.Parameters.AddWithValue("@FileName", strPath);

                     //cmd.Parameters.AddWithValue("@Img", byteFile);

                     //或者

                     SqlParameter[] parameters = new SqlParameter[];

                     parameters[] = new SqlParameter("@FileName", SqlDbType.NVarChar, );

                     parameters[].Value = strPath;

                     parameters[] = new SqlParameter("@Img", SqlDbType.Image,int.MaxValue);

                     parameters[].Value = byteFile;

                     cmd.Parameters.AddRange(parameters);

                     conn.Open();

                     cmd.ExecuteNonQuery();

                     conn.Close();

                     MessageBox.Show("上传成功");

                 }

                 catch

                 {

                     conn.Close();

                     MessageBox.Show("上传失败！");

                 }

         }

 从数据库读取图片显示到窗体：

 //读到图片显示到PictureBox

         private void btnDownLoad_Click(object sender, EventArgs e)

         {

             byte[] bytFile;

             SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True");

                 try

                 {

                     SqlCommand cmd = new SqlCommand();

                     string strSql = "select img from test where ID=3";

                     cmd.Connection = conn;

                     cmd.CommandText = strSql;

                     conn.Open();

                     SqlDataReader sdr = cmd.ExecuteReader();

                     if (sdr.Read())

                     {

                         bytFile = (Byte[])sdr["Img"];

                     }

                     else

                     {

                         bytFile = new byte[];

                     }

                     sdr.Close();

                     conn.Close();

                     //通过内存流MemoryStream，

                     //把byte[]数组fileContent加载到Image中并赋值给图片框的Image属性，

                     //让数据库中的图片直接显示在窗体上。

                     MemoryStream ms = new MemoryStream(bytFile, , bytFile.Length);

                     this.picImage.Image = Image.FromStream(ms);

                     //关闭内存流

                     ms.Close();

                 }

                 catch

                 {

                     conn.Close();

                     MessageBox.Show("失败");

                 }

         }

代码转自IT学习广场http://www.itxxgc.com/net/detail/30

                 来自凌波小屋-----冯和超的笔记-------