Question

I have images stored in the database in byte data type . And i get the byte array as the following :

Stream photo_stream = Photo_DAL.RetrievePhoto(int.Parse(reg);
byte[] photo_bytes = Photo_DAL.StreamToByteArray(photo_stream);

but I don’t know how to make the imageurl =”some url”??

I search and find some articles about handler , but really i don’t know how to use it.please How to read the image like this with some explanation ?

Answer 1

I search and find some articles about handler , but really i don’t know how to use it

You could add a generic handler to your page (MyImage.ashx):

public class MyImage : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        string imageId = context.Request["imageId"];
        // use the image id to fetch the photo bytes from the backend
        byte[] photoBytes = ...
        // ensure the content type matches the one of your image
        context.Response.ContentType = "image/png";
        context.Response.BinaryWrite(photoBytes);
    }

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

and then in some web form you could point the ImageUrl property of an Image control to the generic handler and pass the id of the image as query string parameter:

<asp:Image ID="myimage" runat="server" ImageUrl="~/myimage.ashx?imageid=123" />