AddTo Extension Method
07 Apr 2015Continuing with the theme of extension methods that make life easier, here’s one I tend to have defined in any Rx project I’m working on:
namespace System.Reactive.Disposables
{
using System;
using Kent.Boogaart.HelperTrinity.Extensions;
public static class CompositeDisposableExtensions
{
public static T AddTo<T>(this T @this, CompositeDisposable compositeDisposable)
where T : IDisposable
{
@this.AssertGenericArgumentNotNull(nameof(@this));
compositeDisposable.AssertNotNull(nameof(compositeDisposable));
compositeDisposable.Add(@this);
return @this;
}
}
}
It’s used along these lines:
someObservable
.Subscribe(...)
.AddTo(disposables);
someObservable
.ToProperty(...)
.AddTo(disposables);
Basically it makes it simple and clean to add any IDisposable to an existing CompositeDisposable as part of a reactive pipeline. The alternative is uglier:
disposables.Add(
someObservable
.Subscribe(...))
disposables.Add(
someObservable
.ToProperty(...));
And yes, I do define it in the System.Reactive.Disposables namespace because that means that whenever I’ve imported CompositeDisposable I automatically get the extension method too. One less using statement and whole lot less annoyance.