White Screen Issue in Silverlight OOB - c#

I've a Silverlight Application built with Silverlight 4 to and which works in Out of Browser mode. When I launch the application, there is a white screen appearing for some time. I did some googling, which referred me to a blog post by Mike Wolf, but then the link was removed. So I thought of getting the window handle and hide the window and showing something else till the loading is complete. But I understand we can't do pinvoke from Silverlight 4. But is, there some way I could avoid the white screen?

Maybe you are trying to call a webservice in the constructor of your application class (app.xaml.cs). As far as i know this isn't possible.

Related

WPF application black after locking windows and resume to desktop

We have a small problem with our .net 4.0 wpf application. If the user locks his screen (windows) and a few seconds later unlock the screen (resume to the work), the application looks like this:
The user can not click on any control or do some thing. The curious thing is,
that it only appears if the user is on special tabs, where we use BeginInvoke
and work a lot with threading. I could not find any thing about this bug, besides that BeginInvoke can create those problems.
I also could not find any thing in the windows logs.
EDIT
I use multimonitor, if my application is black, removing the monitor cable an reconnecting it, the application continues to work.
The problem only seems to appear when using the wpf DataGrid. Switching from thsi grid to Telerik-Grid solve the problem, but i could not figure out which part cause the problem.

Windows 8 App / Loading screen

Every application in Windows 8 starts from this kind of view
(below is camera application) :
My question is :
Is this possible to change programmatically this view for
progress bar (C# or XAML) or any other animation ?
Or is this view related with time computer need to start application so
we can not use resource of our app yet ?
You cannot change how the launch screen is displayed. You can only change the picture and color.
However, the way to extend the launch screen is to make sure your app's first action is to display another launch screen (typically identical to the first with an added progress bar) while the rest of the app is getting ready. This approach is described in this guide.
Please keep in mind that an extended load screen might not be the best user experience. After all the user is still waiting for the app to launch. I recommend that you optimize launch time to avoid using the extended launch screen if you can. I cover this in more detail in my book (sorry for the shameless plug).
That screen is displayed while the runtime is starting your application. Its an image as defined by your application, so to my knowledge, there is no way to inject logic.
However, you can make your app "start" fast (so that the runtime removes the "loading" image), then put up a splash screen while the rest of your content loads. The NFL for Windows 8 app does a good job of this, as do several other apps.

How to be OnTop but not OnTop of a full screen application

So I have tried searching for the better part of a day for the answer to a simple question. I want my C# application to popup another winform on a timer and then close it after a delay. Simple enough, done and done. Now my issue is that I want it to actually be on top of other applications UNLESS they are full screen. By that I mean a true full screen application such as a game. I do not want to interfere with such an application since it should take priority over my application.
The issue is that I am using the 'OnTop' property on the popup form and, while it works perfectly for any other applications I have been testing it while playing a full screen game and the form, when it "Show()"s, takes the full screen application and drops it into windowed mode.
Is this the intended effect of the 'OnTop' property with full screen applications? If so is there a way that I can have my form popup on top of normal windowed windows and not interfere with full screen applications?
Any links, example, a kick in the general direction is great. The only hits that I come up with when searching for winforms involving full screen is people trying to get their application into full screen or having their application take focus away from another application.
Thanks on advance.
(I didn't post any code due to it just being a simple winform that is "formX:Show()" on a timer with the "onTop" property set)
(EDIT) So thanks to awilson53 for putting me on the right track I was able to find a method (albeit somewhat picky) to determine if an application is full screen. Seems kinda simple, and an "well duh", answer after all is said and done.
95% of the credit goes to the author of the article: http://www.richard-banks.org/2007/09/how-to-detect-if-another-application-is.html
~5% goes to awilson53 for getting me on the right track. :)
Check out this wrapper for the EnumWindows function. This will allow you to enumerate all open windows and determine their window state. You will want to check the EnumWindowItem.Maximized property, and if it is true set your OnTop property to false. If none of the EnumWindowItem's return Maximised you can set OnTop to true.

Window emitting a sound when I try to restore it from the taskbar

I'm working on a rather big project with my team and after a while, we struck into a big problem.
Infact when we minimize the main window of the application, clicking on the taskbar to restore it results in a "bing" sound (the one that windows uses when you are trying to interact with a background window when a modal dialog is opened on it). I can't restore the window except if I press ENTER button (after obviusly clicking on it).
We are using XNA to render something inside a WindowsFormsHost component in our WPF application and the problem comes out when we change something that is not connected directly with wpf (something inside the rendering engine, so it works only with XNA).
I can't post any code because I don't own any rights of it and would be meaningless because the project is enough big.
So my question is: what are the things that can produce a problem like this one (unable to restore window sound) when you click on the taskbar?
At least I can understand where to search for this bug, because I don't even understand where I shall dirt my hands in.
Important notes: I'm using a splash screen and the problems come up when I do something on a second window (so not directly the main one) which is not modal
Thanks for any suggestion
We solved the problem by finding out that there is a bug with an external component that we used inside our application. Still I don't understand how this bug has been created, if someone has a better answer I'll mark it.

Reset Taskbar Flash in C#

I have an application where the taskbar flashes if an event has occurred. This is working perfectly, and was relatively easy to implement using a Win32 API described below:
http://blogs.x2line.com/al/archive/2008/04/19/3392.aspx
However, when I stop the flashing, sometimes the application is stuck in the "highlighted" state in the taskbar. This only gets reset by clicking on the application in the taskbar, minimizing it, then re-maximizing it. Is there a way to clear this from being highlighted without any user interaction?
Maybe instead of flashing it you could put an overlay icon on it - one line of code from C# with the Code Pack. Then when you want to clear it you could take the overlay icon away - again one line of code. Windows 7 only, however.
Can you post the code that you are using to "Stop" the flashing?
Have you also considered using a different flag such as:
// flash until the window comes to the foreground
FLASHW_TIMERNOFG = 12;
You will still need to click on the applicaiton to get the flash to stop, but you should not have to minimize then re-maximize the app to get the flash to stop.
You can include the FlashTaskbar snippet and use the following code
FlashWindow(Form.Handle, FlashMode.FLASHW_STOP)

Categories