The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 5: FILESTREAM with ASP.NET and SilverlightTo illustrate a slightly more advanced ASP.NET concept, for this lab we willimplement a generic handler, rather than repurposing a web form as a handler.Right-click on the Presentation project, and select Add | New Item and in theAdd New Item dialog box, select the Generic Handler template and give the newitem the name GetItemImage.ashx. At the top of the file, add namespace importstatements for the DataAcess and System.IO namespaces.We will write our code in ProcessRequest(), which is the method called by theASP.NET runtime if the handler is invoked. The code is shown in Listing 5-16.public void ProcessRequest(HttpContext context){context.Response.ContentType = System.Net.Mime.MediaTypeNames.Image.Jpeg;context.Response.BufferOutput = false;}ItemData data = new ItemData();MemoryStream ms = data.GetItemImage(context.Request.QueryString["itemID"]);if (ms != null && ms.Length > 0){context.Response.AddHeader("content-length", ms.Length.ToString());// Reset the current position in the MemoryStreamms.Position = 0;// .NET 4.0 and later method onlyms.CopyTo(context.Response.OutputStream);}Listing 5-16:ProcessRequest() method code.This code contains no references to SQL, connection strings, or other database access.210