UserControls are still Controls, and therefore shouldīut, is it? Based on this explanation, a proper PersonPicker control would have been: What is a UserControl?Ī UserControl is simply an easy way to create a Control usingĬomposition. Never underestimate the names of members and the conceptual communication weight involved. An expectation that the value of this property serves a very specific purpose. The second case suddenly introduces a pre-disposition. Contrast: TextBox.Text and TextBox.Address as names for properties. How is this UserControl not exposing business logic when it's crowded with Domain-specific nouns? Programming is a lot more about names than you may think. You have a UserControl with DependencyProperty-ies named Departments, People, Teams, etc.
#WPF MVVM WMV PLAYER HOW TO#
MVVM (or How to separate business logic from presentation logic) Your approach should definitely also be guided by a bit of philosophy. It is much under-voted because it was posted more than a bit later. I would very much second this answer instead. To begin with, this answer seriously lacks theoretical support (i.e. I feel like there's an elegant solution of code-behind and MVVM but I can't seem to find it! How would you go about solving this requirement? Second Solution: No ViewModel for the UserControl and Rely on the Window's ViewModel This has the advantage of being easy to interact with the UserControl through the Window's ViewModel but it feels like I'm duplicating a lot of the loading of lookup values logic as well as the filtering logic. I ended up having the control's ViewModel subscribe to messages for configuration settings and send messages for reporting value selections and it feels like I'm fighting MVVM/WPF rather than working with it. The problem comes when I then want to get the values and when I want to configure it slightly differently for each scenario, largely because I've broken the DataContext inheritance chain.
The filtering logic is the control's ViewModel as is the loading of all the lookup values. This works as far as I can drop the control on each window and it appears to immediately require no further work. Window 1 might have all the departments, teams, and people Window 2 might only display a subset of all departments Window 3 might be locked to the user's department and team.įirst (and probably worst) Solution: Give the UserControl its own ViewModel In each scenario I might have the control configured in a slightly different manner. My example is Department > Team > Person. The control is a filtered ComboBox setup allowing users to refine their selections. I have a UserControl in my WPF application which I want to reuse in a number of places.
(TimeSpan.FromSeconds(slider.Value), TimeSeekOrigin.I'm struggling to find an elegant and idiomatic way of coding the following scenario using the MVVM paradigm in WPF and was wondering how other people would approach it. Var tl = new MediaTimeline(new = tl.CreateClock(true) as MediaClock I'm trying to implement it using MediaTimeline (i know i can change the Position property, but i had other issues which i'll post in a separate question). I am basically trying to create a WPF based video player which allows you to seek within media. I have also posted this on MSDN forums - i hope its not a problem.
0 kommentar(er)
