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

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