Discussion: event subscription in object initializers

[alrz]

Moved from dotnet/roslyn#5365

Extend object initializer block to support event subscriptions:

var timer = new DispatcherTimer {
    Tick += delegate {},
    Interval = TimeSpan.FromSeconds(1d),
};

->

var timer = new DispatcherTimer();
timer.Tick += delegate {};
timer.Interval = TimeSpan.FromSeconds(1d);

Open question: should we allow multiple event subscriptions for a single event at a time?

var timer = new C{
    Event += delegate {},
    Event += delegate {},
};

[drewnoakes]

I'd love to see this. It'd allow several construction/initialisation operations to become single expressions, which play nicely with other C# features that reduce nesting such as expression bodies, null coalescing, ternary conditionals...

There's some support for this idea on StackOverflow too.

[CortiWins]

I would love this!

[blair-ahlquist]

No. The feature that should be implemented is #1652. It covers the requested feature and does so much more.

[AlmightyFuzz]

I would really like to see this feature added. It would tidy up a lot of existing initialization code where you have to do the following following if you want to use Object Initialization:

var timer = new Timer()
{
  Interval = TimeSpan.FromSeconds(5),
  // further property settings
};
timer.Tick += OnTick;

I'm curious as to why this wasn't added when the Object Initializer functionality was introduced? It looks like a trivial thing to add.

[CyrusNajmabadi]

I'll champion this.

[markusschaber]

Any progress?

[jnm2]

Yes, this falls into #5176