WPF

pavanip wrote:

Can please anyone help me how to do that task using silverlight and .Net.

salon wrote:

Is it possible in Silverlight 2.0?

Mark Salsbery
Microsoft MVP - Visual C++

<br />
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]<br />
    public class RenderService<br />

public void ShowDiagramImageRenderPopup()
{
    System.Windows.Browser.HtmlPage.Window.CreateInstance("showReportDiagramPopup");
}

// Show the report render popup, I'm calling an ASPX that has inside a refernce to an image generated by
// a custom HTTP hanlder (the commented solution, was the one related to download an attachmen)
function showReportDiagramPopup() {
    //http: //www.javascripter.net/faq/openinga.htm
    window.open("DiagramRenderPopup.aspx", "DatabaseDiagram", "scrollbars=yes, width=800,height=600", false);

    // NOT IN USE, rather using popup
    // Finally we are not going to use a popup, we just open the generated image as an attachment
    //window.location = "DiagramImageHandler.ashx"

}

public void ProcessRequest(HttpContext context)
{
    // Restore the XML from Session
    EntityExportDiagram exportDiagram = (EntityExportDiagram)HttpContext.Current.Session["printreport"];

    // In this case we generate a JPEG, we could generate another format (pdf, ...)
    Bitmap bitmap = new Bitmap(width, height,
        PixelFormat.Format32bppArgb);
    Graphics g = Graphics.FromImage(bitmap);

    // <draw_whatever_needed>
    //
    // Erase the background.
    //
    SolidBrush br = new SolidBrush(Color.White);
    g.FillRectangle(br, 0, 0, width, height);
    br.Dispose();

    (...)

    // </draw_whatever_needed>
    g.Dispose();

    // Output JPEG !! :-)
    context.Response.ContentType = "image/jpeg";//"image/gif";

    // ********** ATTACHMENT, What You need
    // Quite important !!!
    // We just tell that the image is an attachment, so we don't have to open a popup
    // just show the user the "open or save" box so he can browse the image or
    // save it to disk. If we remove this, the window.location will fail
    //context.Response.AddHeader("content-disposition", "attachment;filename=DBDiagram.jpg");
    // ********** /ATTACHMENT

    // Intermediate step needed to make it work:
    // Get content lenght tag
    // http://stackoverflow.com/questions/389503/why-asynchronous-ashx-generated-images-doesnt-always-work-in-ie6

    System.IO.MemoryStream memoryStream = new System.IO.MemoryStream();
    bitmap.Save(memoryStream, ImageFormat.Jpeg);
    context.Response.AddHeader("Content-Length", memoryStream.Length.ToString());
    memoryStream.WriteTo(context.Response.OutputStream);

    //bitmap.Save(context.Response.OutputStream, ImageFormat.Jpeg);
    context.Response.End();

    //
    // Clean up and return.
    //
    bitmap.Dispose();


    context.Response.Flush();
    context.Response.Close();

}