Note that we are using the -save option to automatically save these dependencies in our package.json file.ĭuring the server testing phase, we will need a way to send HTTP requests.
#Colorconverter xamarin install
Next, we will install our testing framework, and an expectation library called Chai that serves as a nice replacement for Node’s standard assert function. Our project’s structure will contain an app directory that with the main code, and a test directory with the Mocha test files: $ mkdir app "test": "echo \"Error: no test specified\" & exit 1" Npm’s init command-line option will launch a wizard, which creates a package.json for our project.įor the purpose of this tutorial, answer its questions as follows: $ npm init Node’s official package manager - npm - will help us set up an empty project. We will start by creating an empty directory.
#Colorconverter xamarin how to
In addition, we will create a web server that exposes the above converter and demonstrates how to test asynchronous code. This article will walk you through its installation and configuration, as well as demonstrate its usage by implementing a color converter that can translate from RGB (red, green, blue) to hexadecimal color representation. It’s used for unit and integration testing, and it’s a great candidate for BDD (Behavior Driven Development).
#Colorconverter xamarin update
We just need to add MultiBinding to the targeted property, specify all our bindings, and use the IMultiValueConverter.Ĭreate a converter that extends from IMultiValueConverter, in the values parameter you will receive each value, so every time any of these values change your converter will get notified and update the converted value according to your defined conditions. Thanks to Multi-Binding that scenario is possible to achieve since now we can have an IMultiValueConverter. The problem with this approach is that the converters don’t handle the property change, so if you change the Age after updating the IsAdmin, it won’t update the property value. When you think about how to achieve it, the first thing that comes to mind is to do something like this:īasically, having a CustomerValuesToColorConverter and creating Bindable properties for Age and IsAdmin, then bind it to the ViewModel properties.
Example: If Age is >= 18 and IsAdmin is true then it should return red, if Age is < 18 and IsAdmin is true then would return green, etc. You have multiple properties (Age, IsAdmin, Name) in your ViewModel and according to these properties you want to change the TextColor of a Label.
Have you ever wondered how to pass multiple parameters to a converter, or how to create properties in a converter to change the value based on them? If you want to know how to achieve it then keep reading :). If you don’t know what a converter is, I recommend you reading this article first.
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