- #Uwp colorconverter how to
- #Uwp colorconverter code
One of the nice things about the BoolToContentConverter is that you really can place just about anything in those properties. Which is why I'm providing you with two examples on using this.
#Uwp colorconverter code
Getting a handy piece of code handed over to you is nice and all, but having good examples is even better. This is why we have both a null check and a try- catch statement. Someone may have used the converter on a binding source that isn't of either type bool? or bool.
The conversion method can be a bit tricky for two reasons. I simple chose default values that I thought were fitting and used the constructor to set them. That's the reason why there is a NullContent property. Some bool type properties are actually bool? type properties, so it's possible they may have a null value, when binding to these guys. The true and false should be self explanatory, but a beginning programmer might not have much experience with Nullable objects which usually look something like int?, double?, bool?, etc. You have three object type properties that will house the content that will be returned when given a Boolean value. The BoolToContentConverter can be broken down into three sections: Public object ConvertBack( object value, Type targetType, Return boolValue ? TrueContent : FalseContent Public object Convert( object value, Type targetType, These properties will store the content you want to return when given a certain Boolean value.Ĭopy Code public class BoolToContentConverter We just have a class that implements the IValueConverter with three extra properties. The code for the BoolToContentConverter may look a bit bloated, but it's nothing to be scared of. Backgroundįor this to be useful, you will need to know: You could also do this by coding things into the code behind file, but that kind of defeats the purpose of separating your UI from the rest of your code. I haven't looked at that in a while, but I think there were around seven sources for a property value. Sure, you can also do this with triggers, but if your values keep switching back to their default settings, then you'll need to know a bit about the Dependency Property Value Precedence System that WPF uses to choose the select values of Dependency Properties. This is where my BoolToContentConverter comes in. Switching that converter from solid color brush to just brush made me realize that I could have just done a BoolToObjectConverter and gotten rid of quite a few classes in the code base for the project we were working on. That bool to Brush converter was originally a bool to SolidColorBrush converter, but as soon as I wrote that, I thought, that's way too specific. Need to set a text color, based on the success of an operation, write a bool to Brush converter. Need to set the background image on a button based on some bool value of the selected item, write a bool to BitmapImage converter. At first, I would create a user control or converter for just about everything I've seen a few other people go down that same path. And, I've found that a simple bool to object converter takes care of a lot of my problems. Great post.I've created a lot of bindings to boolean values that required a converter of some kind. It was the converter naming convention (that was new to me) helped me to find it in the Object browser window. It would be helpful to mention that this converter already exists in namespace in the Presentation assembly and can be directly used in XAML as The fact that you used this as an example kind of lead me to believe that it doesn't exist as part of the framework. #Uwp colorconverter how to
Maybe useful to mention how to use the parameter: ToolTip="" correct? Great article just a typo: valueConverter instead of ValueConvers It would help a lot if you would add the namespaces one has to add in order to use your examples. Last modified: 07:56:23 Copyright (c) by Christian Moser, 2011.Ĭomments on this article Show all comments
0 kommentar(er)
