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Old April 8th, 2008, 06:58 AM
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Default How to view picture by using form view?

i wish to use form view to display data that binding to database, the problem is how to display picture by using form view? can anyone solve my problem? thanks...

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Old April 8th, 2008, 07:17 AM
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Default

Here is one way to do it. First add Image control to the view:

<asp:Image runat="server" ImageUrl='<%# Eval("PictureID", "pic.ashx?id={0}") %>' />

Take notice image's url: pic.ashx?id=<picture id>

When browser sees this, it calls back the server to download the image. Then write custom HTTP handler to spout out the image:

Code:
public class PictureLoader : IHttpHandler
{
    bool IHttpHandler.IsReusable { return false; }

    void IHttpHandler.ProcessRequest(HttpContext context)
    {
        SqlConnection conn = ...
        SqlCommand cmd = 
            new SqlCommand("SELECT PictureData FROM Pictures WHERE PictureID = @id", conn);

        byte[] pictureData = (byte[])cmd.ExecuteScalar();

        context.Response.StatusCode = 200;
        context.Response.AddHeader("Content-Length", pictureData.Length.ToString());
        context.Response.ContentType = "image/jpeg";
        context.Response.BinaryWrite(pictureData);
        context.Response.End();
    }
}
Then register your handler in web.config like this:

Code:
<system.web>
  <httpHandlers>
    <add path="pic.ashx" verb="GET" type="PictureLoader" />
  </httpHandlers>
  ...
And because I'm lazy writer remember to check from MSDN what all those custom handlers are/do and you get a clearer picture about all of this.


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