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How to implement a progress bar using the MVVM pattern
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I have window with a lot of items and tools, what I want to do, and ask about, is how can I show a progress bar while the window is loading with a WPF main or child window?
You could try this link:
http://bensprogrammingwork.blogspot.com.br/2012/01/progressbar-in-wpf.html
Might be helpful, I could try to explain more but I don't really know what's your struggle.
It is pointless attempting to do that with WPF because by the time the Framework has loaded your application and you are able to display a Window with a progress bar, the MainWindow.xaml page will have already loaded.
There is a way to display a static image before the application has fully loaded, but you cannot animate any part of it. You can find out how to do that in the How to: Add a Splash Screen to a WPF Application page on MSDN.
If you definitely want a loading animation upon start up, you will have to wait until the application has finished loading and then 'pretend' to the users that it is still loading with your animation... pretty pointless I think you would agree.
Even so, if you are determined to go down that path, you can find a working example of a loading animation in the A Simple WPF Loading Animation page on the ElegantCode website.
UPDATE >>>
Oh sorry, I didn't realise that this was not just for the start up Window. No, you can only use the splash screen upon application start up. The problem that you will find when displaying an animation when a Window is loading is that (generally) the Window is loaded using the UI thread. As your animation will also be using the UI thread, you will find that it probably won't run smoothly because the UI thread is busy loading and initialising the Window. You can still try using the last link that I provided for this, but don't expect too much.
Related
I have a WPF Application using MVVM pattern. Startup window consist of 3 controls Menu,TitleBar and a DataGrid. Currently it takes around 5 seconds to complete all the operations( fetching data from service, dynamically generate DataGrid and its rendering) and after that it displays all of a sudden to UI. Problem is, the end user has to wait for 5 seconds to see the window after starting the program. Most of the operations is related to DataGrid. So I moved the DataGrid related code to Window Loaded Event and now the window open suddenly but showing a black screen and after some time it shows the DataGrid with data.
So my aim is to show the window with Menu and TitleBar and after completing the initial load, do the task to load the DataGrid in a background thread so that I can show a loading panel in the view. How can I call that particular method that related to DataGrid after completing the initial load?
Also, I can't use Splash screen(it's in the requirement).
Please suggest?
You should perform any long running process in a background Thread... this will free up your UI. If you are not familiar with multi-threaded applications, take a look at the BackgroundWorker Class page at MSDN, as it features code examples.
Another thing to note it that you should add IsAsync="True" property to your Binding declaration on the DataGrid.ItemsSource to let it know that it must wait for data. In this way, your DataGrid will be displayed empty and then when the data is ready, it will populate.
I'm developing a C#.NET (4.0) WinForms application. On startup I want to have a splash screen that fills a series of datagridviews on a different form.
At the moment the main form loads that data into the DataGridViews on Form_Load but this makes the Form hang there while this is happening.
So how do I call the method that loads the values to the DataGridView from the splash screen?
I'm rather new to C#.NET, I'm trying to move away from VB.
I would have the splash screen launch the real form where the DataGridViews are, and in that form put the data loading method on its own thread. For a nice and simple and beginner way, use a BackgroundWorker. For more advanced control use Threading.
How to use background worker.
Threading Class Docs
Very good tutorial on threading
EDIT:
As you mentioned in your comment it sounds like you still don't want the form to even appear until its done loading in the data. The easy way to do this is have the main form be hidden from startup, and in the on-load event launch the splash screen, and then when the method that does the data loading returns, set the visibility to true and close the splash screen form.
There are many ways to have a form start hidden. Here is a good forum question with lot of answers on different ways to do it.
In my WP8 application I have a UserControl with an active Storyboard animation that makes that UserControl to move in a desired direction. At some point during that animation I programmatically add second UserControl to the scene.
The problem is that second, dynamically added UserControl contains a lot of elements inside and takes substantial time to render. While it loads, the UI is being blocked for about 50 milliseconds on my phone and the glitch in first UserControl's Storyboard animation is very noticable.
Question is what can I do about it? Should I somehow run animation in a different thread? If so then some general examples/links/manuals will help a lot because I'm not too versed in threads business. If that's not an option then I'd like to hear whatever can help me here.
I wouldn't advise threading on windows-phone; also you should avoid threading if you have data that needs to be shared between threads. It can be done but it's not easy.
If possible I would pre-load your user controls (or group of controls) and then show/hide them as they are needed. That should prevent the glitch you are seeing. If you need help with how to preload please post some example of how you are dynamically loading your controls and we may be able to assist you.
If you do need to do multi-threading I would advise using a background worker more details here:
http://msdn.microsoft.com/en-us/library/windowsphone/develop/cc221403(v=vs.105).aspx
I'm writing an application for wp7 with several pages, and i want to the splash screen image at the load of every page i have in the app - so the user would figure out he needs to wait a few seconds.
The default splash screen image is fine for me, but i don't know how to do it.
thanks for any help!
You can customize your own splashscreen dont need to use the default
Use the Loading method for the page which should be located on a panel on the left side of Visual Studio's Screen
You can do this by loading the SplashScreen Image on load of every page for some predefined time. And meanwhile other tasks can be done on Background threads (if they are not related to UI).
Also if you want to show a loader to User, you can create a Grid with some Background (semi transparent) and a Progress Bar on it. You can set its Visisbility true before any process which will take time and then hide it after process ends and Application is ready for user..
I would like to use a regular window for splash screen, so no PNG splash screen but a normal window where I can add some bitmaps on.
What is the best way: to keep in app.xaml the loading of the main screen and put the splash screen in the constructor or somewhere in an event handler?
The splash scren itself is quite easy, just has some labels, a link, a few images and just waits a few seconds before closing, no actions to be done while waiting.
Specifically for a splash screen, it is very important to make use of the functionality introduced in .NET 3.5 for this purpose. If you simply use a vanilla Window it can take quite some time for the WPF stack to initialize, and in the interim the user will not be seeing any feedback for their "launch the app" action.
Of course this does not satisfy the requirements of the question ("use a regular window"), but if it's not acceptable I would recommend using an different technology than WPF entirely because of the problem mentioned above.
I have myself designed my WPF app dynamic splash screen in which there was an animation, dynamic software Number which changed for each and every software, a label which was updated every 1/2 ms to show some random filename in the sofware directory.
To be frank i used this link to create mine
http://www.codeproject.com/Articles/38291/Implement-Splash-Screen-with-WPF
There are other links which i can provide you
http://www.codeproject.com/Articles/116875/WPF-Loading-Splash-Screen
http://www.olsonsoft.com/blogs/stefanolson/post/A-better-WPF-splash-screen.aspx