Wpf textbox validating event traditional dating rules
To accommodate, every Xxxx event has an On Xxxx() method.
Let’s take a look at an example in which we will add validation support to our input view, and in large application you will probably need this a number of places in your application. Sometimes on Views, sometimes on View Models and sometimes on these helper objects there are wrappers around model objects. It’s a good practice for putting the validation support in a common base class that you can then inherit from different scenarios. To me, it resembles a lot like the Decorator pattern, where you can enhance the look of your bound control without affecting it’s default state and behavior.If you want to limit text allowed as input to a Text Box, a full strategy for checking text being input should include handling the Preview Key Down and Preview Text Input events, as well as implementing a pasting handler.