topic Re: Printing not working in ArcGIS API for Silverlight Questions

Printing not working

MarkBaird — Thu, 24 Feb 2011 12:08:07 GMT

I'm trying to use silverlight printing to print a map.

Now it all works fine if you print a map which is visible in your silverlight application using standard silverlight printing methods. The only problem is that I want my prints to fill the page I'm printing on and not be constrained by the screen size!

This article tells you how to do it, however if you introduce a map, it prints the control, but it never shows any map layers.

http://www.silverlightshow.net/items/Advanced-printing-in-Silverlight-4.aspx

So basically I've created a user control which contains a map and some text blocks for header and footer information. If I add the map to the layoutRoot on my silverlight application is displays fine (it fires the Progress event of the map cotrol).

However if I make an instance of the control and set this as the item I want to print, everything on the control prints including header for footer information I've created, but the map remains blank (although it fills the page which is what I wanted). In fact it remains blank because it doesn't draw the layers as I can see the Progress event is never fired.

What is going on here? Is there anyway of printing a map control which isn't attached to the visible part of the silverlight applicaiton? How can you force it to draw?

WYSIWYG printing isn't very good in a map browser as the screen size isn't the same as the paper!

Help appreciated

Thanks!

Re: Printing not working

DominiqueBroux — Thu, 24 Feb 2011 13:48:29 GMT

The issue is probably that a layer can't be included in many maps. So if you want at the same time the main map and a preview of the print, you need to clone the layers for previewing them.

This is done this way is this print sample: http://www.arcgis.com/home/item.html?id=e361c2cc69784fcba34358d0458f66e3

Re: Printing not working

MarkBaird — Thu, 24 Feb 2011 16:04:03 GMT

I'm creating all of the layers in my printMap control by phically adding them in again. For example:

                //Bing Layer
                ESRI.ArcGIS.Client.Bing.TileLayer bingLayer = new ESRI.ArcGIS.Client.Bing.TileLayer
                {
                    ID = "BingLayer",
                    LayerStyle = ESRI.ArcGIS.Client.Bing.TileLayer.LayerType.Road,
                    Visible = true,
                    ServerType = ESRI.ArcGIS.Client.Bing.ServerType.Production,
                    Token = Application.Current.Resources["BingKey"].ToString()
                };
                printMap.Layers.Add(bingLayer);

The problem is if I display my control, like this I can print:

            //create the printer view
            printerView = new PrinterView();
            LayoutRoot.Children.Add(printerView);

Once it has drawn, then you can call the following:

            PrintDocument printHandler = new PrintDocument();

            printHandler.PrintPage += new EventHandler<PrintPageEventArgs>(printHandler_PrintPage);
            printHandler.Print("Print Page");

But if I create the PrinterView and don't add it to LayoutRoot and send it to the Print methods you always get a blank map.

I need a way of forcing the Map control to redraw.

Re: Printing not working

DominiqueBroux — Thu, 24 Feb 2011 16:43:53 GMT

One option is you to create a popup (with an opacity set to 0.0 if you want it hidden), and put your printerView (or your main control containing the map) inside this popup.

Re: Printing not working

MarkBaird — Thu, 24 Feb 2011 18:18:26 GMT

Well I've tried it and it kind of works. Only problem is if you size the control to your paper (A4 for example) it is bigger than the dimensions of your screen. If you print something bigger than your screen it gets cropped by the Silverlight print methods. This why you don't have it connected to your GUI (as in the link in my first post). WSYIWYG printing isn't what I want, I need to dimension my prints so they fill the paper.

I like a challenge!:D

Re: Printing not working

DominiqueBroux — Thu, 24 Feb 2011 22:29:09 GMT

Did you try with a popup?
As far as I remember, I think there is no limitation to the screen size with a popup.

And for sure the sample I pointed out is working when printing (with or without preview) to a printer bigger than the screen (A2, A1, A0).

Re: Printing not working

MarkBaird — Fri, 25 Feb 2011 13:44:59 GMT

Had a productive day once I'd discovered that once you land your grid that you want to print within a ScrollViewer the size restrictions go away...

I've now got printing that fills the paper!

Thanks for the help!