#VISUAL STUDIO FOR MAC XAML CODE#
There is for sure much more to come as Marco from the XAML Tooling team tweeted about the new feature and discussed with commentors about extending the templates for code that is being generated. This is all from me just playing around with Visual Studio 2019 v16.9 for a few minutes exploring this awesome new feature. Then you will see lightbulbs on any control inside of the DataTemplate!!Īgain, this is pretty mind blowing and amazing! I was able to create all of my ViewModels and Models all without leaving the XAML! Just the start! So far we have had Visual Studio generate code in our ViewModel classes on our page, but what about our models that are bound to an ItemsSource in a ListView or CollectionView Well no worries, all you need to do is set your x:DataType on your DataTemplate: Public ICommand ClickCommand => clickCommand ?= new Command(Click)
Will be upgraded to this lovely clean tight code: private ICommand clickCommand
#VISUAL STUDIO FOR MAC XAML UPGRADE#
Once you upgrade to 8.0 or higher the old code: private ICommand clickCommand Take a look at my previous blog about upgraded a project to C# 9 in a minute. However, you can easily adjust what version of C# is used in your project by adding the LangVersion into your csproj. NET Standard 2.0, which defaults to C# 7. That is because my WPF sample app is using. One of the things you may have noticed is that the code for Xamarin.Forms and WPF/UWP are different in the screenshots. MIND BLOWN!!!! ARE YOU NOT IMPRESSED!?!?!? Amazing! Cleaner Code with C# 8 & 9! However, if you are using a framework or library such as Mvvm Helpers then it will be smart enough to figure it out and recommend code for you! If you are over on UWP or WPF you will not see this code generation because the core framework does not have an implementation of ICommand. This code is really neat because it not only created the command and the method, but it also brought in the correct namespace to use the Xamarin.Forms Command! Now, let’s say we are going to add a Command to a Button we would naturally want that code to be generated as well, correct? Well, you are in luck because it will! Is your mind blown yet?!?!? Mine is! However, it gets even better! Generating Commands! Now, if you add another control with another binding, you will see nice tight code will be generated for you: SetProperty(ref field, newValue, propertyName, null, null) Public bool SetProperty(ref T field, T newValue, string propertyName = null) => If you are using Mvvm Helpers, you can use this code as your base: public class ViewModelBase : BaseViewModel Here, it is recommending adding the property and creating a SetProperty method to invoke Propert圜hanged, which is AWESOME!!!! Now, at this point you probably want to refactor the code a little bit and create BaseViewModel that you put this method in and then in future ViewModels it will not attempt to create the code and just add the property. With this code in place, you will now see the dots remain and a new lightbulb show up to create a property called Text for you! What is x:DataType you may be asking? Well, it is a compiled binding, which makes your bindings and apps faster! This is an awesome feature of Xamarin.Forms that you should totally use! When I selected this option, it auto added the following code: xmlns:app1="clr-namespace:App1" The lightbulb will look to assign your x:DataType in Xamarin.Forms or d:DataContext in WPF/UWP. Once you do this, Visual Studio will put little dots under the Text binding and a lightbulb will show up (if you don’t see this simply re-compile). Then just create a control with a Binding associated with it. The first thing to do is to create your ViewModel and implement INotifyPropert圜hanged (or inherit from something that does). I will walk through this awesome feature for Xamarin.Forms, WPF, and UWP, but if you just want to see it in action, I made an entire video: We have seen increased IntelliSense in this area, but with the release of Visual Studio 2019 v16.9 comes code generation from XAML! That is right, you can now have Visual Studio automatically create your properties, commands, and more! One thing that I have always been hoping for as a XAML developer is deeper connectivity between the XAML and the View-Model. Visual Studio has been crushing it with new refactorings, IntelliSense, and IntelliCode, one of my favorite features ever. The more and IDE or code editor can do for you the better I say.
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