SuperJMN

MVVM framework replacement

Goal

We want to replace ReactiveUI by another MVVM toolkit. The candidate for such move is the library called CommunityToolkit.Mvvm AKA Microsoft.Toolkit.Mvvm. This text will use “CTM” for short.

Evaluation

The library has been evaluated, focusing on features that can be useful for Wasabi Wallet.

Features

SuperJMN

void Main()
{
	var result = ReadUser("JMN")
		.Map(u => FindProduct(u))
		.Map(p => ReadTechnicalDetails(p))
		.Map(pd => View(pd))
		.Handle(response => ErrorView(response));
		
	Console.WriteLine(result);
}

SuperJMN

Why is the .NET community so disperse, unwelcoming, unfocused and decreasing?

1. .NET doesn't have a real community: there's no sense of belonging to a community. There are more or less big clusters, usually attached to particular projects.
2. Microsoft usually acts like a competitor instead of a facilitator.
   • You can't try to do better than Microsoft. Whenever a project is doing some real good job in an area in which Microsoft has already placed its bet, you'll not only be ignored, but also repudiated by a big bunch of microsofties. You'll be on your own.
   • Eventually, if a community project looks like a winner and is getting momentum, Microsoft will try to catch up and make up for lost time creating an enemy product (usually inferior) in an attempt to undermine it.
3. .NET fails to get to the young people. Why? because beginners usually start doing front-end, and front-end isn't .NET:

• Front-end catches young people because it's visual and looks "easier" to get fancy resu

SuperJMN

Compile-time issues

Problem 1

error CS0260: Missing partial modifier on declaration of type 'ActualSizePropertyProxy'; another partial declaration of this type exists

All classes inheriting from UIElement must have the partial modifier. This is because of the NativeCtorGenerator This is present to avoid random crashes caused by iOS/Android internal behavior

Problem 2

warning NU1701: Package 'CommonServiceLocator 1.3.0' was restored using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.

SuperJMN

public class UefiDownload : IDeploymentTask
    {
        private readonly IGitHubDownloader downloader;
        private readonly IFileSystemOperations operations;

        public UefiDownload(IGitHubDownloader downloader, IFileSystemOperations operations)
        {
            this.downloader = downloader;
            this.operations = operations;
        }

SuperJMN

using System;
using System.Reactive.Linq;
using Windows.System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Input;
using Microsoft.Xaml.Interactivity;

namespace App2
{
    public class KeyTrigger : Trigger

SuperJMN

using System;
using System.Collections.Generic;
using Windows.UI.Xaml;

namespace IbercajaPay.UWP.Controls
{
    using System.Collections.ObjectModel;
    using System.Reactive.Linq;
    using System.Threading.Tasks;
    using Windows.Data.Pdf;

SuperJMN

* The language will represent a tree. Each node can have zero or more children.
It will look like this text (tabs matter):

Root
	A
		B
			C
			D
			E
		F

SuperJMN

using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using static System.Math;

public class Viewbox : Decorator
{
    private IControl Root => Child;

    protected override Size MeasureOverride(Size constraint)

SuperJMN

namespace Mcd
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Console.WriteLine (Calculo.Mcd(75, 100));
		}
	}