Registering for notification events requires extra bookkeeping code that obfuscates business logic.
Update Controls is an open source library that replaces event-based data binding with automatic discovery and updating. WPF data binding requires that a bindable class implement the INotify Property Changed interface.
He blogs his discoveries along the way at Adventures In Software (
The INotify Property Changed interface, while easy to implement, is hard to consume.
It can be considered as a , each of these task being assigned a priority. By doing the calls to , you are forcing a switch between thread execution and it costs a lot of processing which can be disastrous in term of performance.
The rendering of the UI is one of these tasks and all you have to do is tell the Dispatcher: “perform an action now with a priority less than the rendering”. My disclaimer is so: do this only when necessary, really necessary.
To make it work, I started the job in the Content Changed method to be sure the content is rendered once first.
The ninety-third part of the Windows Presentation Foundation Fundamentals tutorial continues to look at data binding using the Data Context property.
The current work will then wait for the rendering to be done. Net: so the Dispatcher will wait for the rendering to be done before to execute the empty action(I agree that waiting to do nothing is quite strange but.. Because the call to Invoke is blocking, your code won’t go on until the rendering is effectively done. By the way, you can quite easily limit the occurrence of the context switches by doing the call every X(where X can be 5…) added items instead of after each item add.
I discovered that when I use this technique inside of the Loaded event handler of a Windows, it’s content was staying white until the long-running job stops.
I have a WPF project where I am using the entity framework. Clear() but I am still not able to update the collection.
I have switched all my collection types to Observable Collection and I am also using the Property Changed event. You are creating a brand new instance of the view model in your click handler.
Now, I wan’t to talk about something which can useful in every WPF application : how to wait for the rendering UI to be done.