WPF Discussion Boards

Re: Downloading file from server

23-Mar-09 9:51

In Silverlight 2, the only access you have to the user's local hard disk
is using Isolated Storage:

Silverlight Isolated Storage[^]

Silverlight 3, now in beta, provides a save-file dialog that will allow the user
to select a place you can save the file to. Note that this will still require user
interaction - you won't be able to just write anywhere you want to.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

sumit703423-Mar-09 18:59

sumit7034

23-Mar-09 18:59

Thanks

Re: Downloading file from server

Braulio Dez1-Apr-09 5:58

Braulio Dez

1-Apr-09 5:58

You can do it using a trick.

Instead of calling the web service, from Silverlight call javascript method that will make an open to a given URL, this URL will point to a custom HTTP handler, then you return your file (implementing a custom HTTP handler it's easy can send you some info or link), you only has to say that the file is an attachment.

In my case I just render e jpeg, js:

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"

}

In Silverlight:

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

HTH
Braulio

/// -------------------------
     Braulio Díez

     DBSchemaEditor.com
     Free Silverlight based DB Schema Modeling Tool
/// -------------------------

RoutedEvent compare to event?

mildred-frontfree22-Mar-09 23:34

mildred-frontfree

22-Mar-09 23:34

It seems that RoutedEvent is quite similar with event. Is it true that we can do anything by event instead of RoutedEvent? If it is true, what is the advantage of RoutedEvent?

ABitSmart23-Mar-09 0:04

23-Mar-09 0:04

mildred-frontfree wrote:
It seems that RoutedEvent is quite similar with event.

Which "event" are you referring to ?

Routed events are very powerful UI events. They are flexible enough to be placed at any place in the Element tree and handled by any other element. You can have a set of buttons and all the clicks handled at a common root. Also, there are scenarios like EventTriggers in XAML which only work with Routed events.

More information here[^]

mildred-frontfree23-Mar-09 0:24

mildred-frontfree

23-Mar-09 0:24

Well, let me explain myself a little bit clear. On msdn there is a example like this.

<br />
public class MyButtonSimple: Button<br />
{<br />
    // Create a custom routed event by first registering a RoutedEventID<br />
    // This event uses the bubbling routing strategy<br />
    public static readonly RoutedEvent TapEvent = EventManager.RegisterRoutedEvent(<br />
        "Tap", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyButtonSimple));<br />
<br />
    // Provide CLR accessors for the event<br />
    public event RoutedEventHandler Tap<br />
    {<br />
            add { AddHandler(TapEvent, value); } <br />
            remove { RemoveHandler(TapEvent, value); }<br />
    }<br />
<br />
    // This method raises the Tap event<br />
    void RaiseTapEvent()<br />
    {<br />
            RoutedEventArgs newEventArgs = new RoutedEventArgs(MyButtonSimple.TapEvent);<br />
            RaiseEvent(newEventArgs);<br />
    }<br />
    // For demonstration purposes we raise the event when the MyButtonSimple is clicked<br />
    protected override void OnClick()<br />
    {<br />
        RaiseTapEvent();<br />
    }<br />
<br />
}<br />
<br />
<br />

But, from my point of view, I could although done it this way

<br />
public delegate void DelegateClickEventHandler();<br />
public event DelegateClickEventHandler DelegateClickEvent;<br />
<br />
protected ovveride void OnClick()<br />
{<br />
   if(DelegateClickEvent!=null)<br />
   {<br />
       DelegateClickEvent();<br />
   }<br />
}<br />

And I could use this event in XAML either. So i am a little confused.

Pete O'Hanlon23-Mar-09 1:00

23-Mar-09 1:00

Routed events, cunningly enough, are designed to support event routing. Basically this mechanism allows you to register an event inside one element but, and this is the clever part, it can be raised by a completely different element. A simple example (and commonly quoted) is that a toolbar button click can go through the toolbar, then maybe a toolbar container, before finally being handled by your code. As you can see, this goes way beyond what you can manage with a simple event because the event would not bubble up in a traditional event scenario.

The problem you have here, is that the example on MSDN isn't terribly well explained, and the concept isn't clearly defined on the MSDN either.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

ABitSmart23-Mar-09 1:29

23-Mar-09 1:29

That was nicely explained Smile | :)

That example on MSDN is pathetic and is more misleading than helping. When you read the explanation you somewhat get the picture but when you reach the example, it totally leaves you guessing into the behavior as of a normal event.

Pete O'Hanlon23-Mar-09 2:50

23-Mar-09 2:50

ABitSmart wrote:
That was nicely explained

Thanks.

ABitSmart wrote:
That example on MSDN is pathetic and is more misleading than helping.

Isn't it just? I really wish they'd up the quality of samples on MSDN. I used to rely heavily on MSDN - now, I tend to ignore it.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

ABitSmart23-Mar-09 2:56

23-Mar-09 2:56

It doesn't matter anymore. My MSDN is Josh, Sacha, Karl, Dr.WPF and Pete[^] Smile | :)

The WPF disciples are fabulous!

Pete O'Hanlon23-Mar-09 3:08

23-Mar-09 3:08

Thanks - it's an honour to be among such giants, and the Disciples are as fine a bunch as you'll ever meet.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

ABitSmart23-Mar-09 1:24

23-Mar-09 1:24

Pete gave a nice explanation. Just to highlight, the Tap event of your example could be handled by any other UI element in the Element tree instead of your Element. Also, could be used as an EventTrigger to start an animations when the event is fired. You can derive the analogy on similar lines as a CLR property and a Dependency Property.

Web Service Software Factory

mildred-frontfree23-Mar-09 15:18

mildred-frontfree

23-Mar-09 15:18

Now I'm much more clear. As you said, I was totally confused by the example in MSDN. It appears that MSDN just offer a example which can be perfectly debug, but you can not learn the characteristic. Well, Especially in China, little company is using WPF. And you could not find many resources about WPF. Anyway, specail thanks for ABitSmart and Pete. Rose | [Rose]

Kamal Gurnani22-Mar-09 19:11

Kamal Gurnani

22-Mar-09 19:11

Hi,

What is Web Service Software Factory and Web Client Software Factory?

Re: Web Service Software Factory

Pete O'Hanlon22-Mar-09 23:39

22-Mar-09 23:39

Kamal Gurnani wrote:
What is Web Service Software Factory and Web Client Software Factory?

This isn't Jeapordy. Here's one for you - what is Google?

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: UIPAB for Composite WPF

UIPAB for Composite WPF

snowwolfchicago22-Mar-09 6:45

snowwolfchicago

22-Mar-09 6:45

Hi everybody,

We are using Composite WPF for our new project, and I'm looking for UI process library for it. For WinForm applications, there is UIPAB, while for WPF, I can't find anything like that. I looked into the Workflow Foundation, but it lacks the features in UIPAB. Any suggestions for UI process design and development for Composite WPF?

Thanks,

Jie

rkaushik13-May-09 9:15

rkaushik

13-May-09 9:15

I do not see any reply.But as far as i know we can customize the UIP App block for WPF.

NearestNeighbor rendering making mistakes?

derm221-Mar-09 13:32

derm2

21-Mar-09 13:32

Hi,

I was really happy to see the NearestNeighbor rendering added in SP1. I thought this would solve the blurry images and such, but what I see is that it's rendering my images incorrectly. It seems to omit rows or pixels if the image is at certain locations. This is easily reproducible by aligning an image to the center of the window, and slowly resizing the window.

I don't think this is supposed to happen with NearestNeighbor rendering since the image has the same resolution as my display.

Here is Sparpness.PNG from the Microsoft PixelsSnapping tutorial for example:
http://img5.imageshack.us/img5/4061/sharpnessfail.png[^]

Is there any way to make this work?

Re: NearestNeighbor rendering making mistakes?

Mark Salsbery22-Mar-09 6:52

Re: NearestNeighbor rendering making mistakes?

22-Mar-09 6:52

I'm curious...

What if you try four side-by-side renders (similar to the
code at Pixel Snapping in WPF Applications[^])...

1) SnapsToDevicePixels=False, RenderOptions.BitmapScalingMode=Unspecified
2) SnapsToDevicePixels=True, RenderOptions.BitmapScalingMode=Unspecified
3) SnapsToDevicePixels=False, RenderOptions.BitmapScalingMode=NearestNeighbor
4) SnapsToDevicePixels=True, RenderOptions.BitmapScalingMode=NearestNeighbor

Do any of those combinations render the way you'd like?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

derm21-Apr-09 9:44

derm2

1-Apr-09 9:44

None of them is correct. Looks like snapstodevicepoxels has no effect in images at all.

NearestNeighbor always, and it's always blurry without nearestneighbor.

Drag and Drop Feature in Silverlight Media Player Control

pavanip20-Mar-09 21:39

pavanip

20-Mar-09 21:39

Hi,

I am new to Silverlight Applications. I created one media player control to play video in asp.net website.I want to drag and drop that media player control to desired place when we run the application but there are no events to drag and drop the video. I tried media element control its working fine for drag and drop functionality but i want that feature in media player control. Is there any other alternatives to drag and drop videos to desired place when we execute the application.

Thanks in Advance
Pavani

Re: Drag and Drop Feature in Silverlight Media Player Control

Mark Salsbery22-Mar-09 6:32

Re: Drag and Drop Feature in Silverlight Media Player Control

22-Mar-09 6:32

pavanip wrote:
I tried media element control its working fine for drag and drop functionality but i want that feature in media player control.

Isn't the MediaPlayer an ASP.NET control?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

pavanip22-Mar-09 18:31

pavanip

22-Mar-09 18:31

I used Media Player control in Asp.Net but i am not getting how to Drag and Drop Video to desired location using that media Player control.

Re: Drag and Drop Feature in Silverlight Media Player Control

Mark Salsbery22-Mar-09 19:32