How to download and view images from SQL Server table?

Question

I have a problem. I want to download and view in browser images from a SQL Server table. I don\'t know how to do.

My code:

public partial class IndexForm         


        

Answer 1

You will have to use an HttpHandler in order to transform back your byte array.

    public class ImageHandler : IHttpHandler
    {
      public void ProcessRequest(HttpContext context)
      {
         int id = context.Request.QueryString.Get("ID");
         SqlDataReader rdr;
         byte[] fileContent = null;
         const string connect = @"Server=your_servername;Database=your_database;User 
         Id=user_id;password=user_password;";

         using (var conn = new SqlConnection(connect))
         {
            var qry = "SELECT FileContent, MimeType, FileName FROM FileStore WHERE ID = @ID";
            var cmd = new SqlCommand(qry, conn);
            cmd.Parameters.AddWithValue("@ID", id);
            conn.Open();
            rdr = cmd.ExecuteReader();

            if (rdr.HasRows)
            {
              rdr.Read();
              context.Response.Clear();
              context.Response.ContentType = rdr["MimeType"].ToString();
              context.Response.BinaryWrite((byte[])rdr["FileContent"]);
              context.Response.End();
            }
         }
      }

      public bool IsReusable
      {
        get
        {
          return true;
        }
      }
    }

Once your image handler is created, register it in your web.config file.

  . . .
  
    . . .
    
      
      . . .
    
  
  . . .

Then add the route to ignore in order to handle the file

routes.IgnoreRoute("{handler}.ashx");

Finally, you will be able to display the image by calling it from your html

Regards.