Comments on: A Queued BackgroundWorker Using Generic Delegates

By: Chris S.

Chris S. — Mon, 13 Jul 2009 14:05:12 +0000

Matt, thanks for providing this example.

This solution is exactly what I needed for the application I’m writing. Your code required reading MSDN on my part, because I didn’t understand lambda and parameter typing, but it forced me to learn.

Thanks.

By: John

John — Fri, 15 May 2009 13:16:53 +0000

Hi Matt. a colleague of mine and I were discussing the code sample you posted, and we were both wondering about your reasoning behind the design of this solution. Why are you queing up individual background threads, instead of sending the data you want processed synchronously to one background thread? Wouldn’t queing up additional threads create a lot of unnecesary overhead?

Thanks!
-John

By: Chris

Chris — Thu, 30 Apr 2009 15:59:28 +0000

Awesome piece of code! I haven’t played around with even the new .NET 3.0 features yet but it looks like there’s some great new additions.

Cheers!

By: Tom

Tom — Wed, 14 Jan 2009 15:17:41 +0000

HTML is eating some of the signs. For anyone looking at this page and wanting to grab the code: If you View..Source (or whatever works to see the HTML code off your browser), you can get the complete code segments off the website.

By: Tom

Tom — Tue, 16 Dec 2008 19:32:43 +0000

Hi,
There are no left brackets in the code…see sample below. Is it possible to download the file somewhere?

public static void QueueWorkItem(
Queue> queue,
Tin inputArgument,
Func, Tout> doWork,
Action> workerCompleted)

By: cj

cj — Mon, 08 Dec 2008 22:53:36 +0000

first of all, thank you for posting this great background worker code. i’ll freely admit that i’m new to delegates and lambdas, and i’m not quite sure how to add a background worker progress report method to what you already have here. is it possible to add a progress reporter to this? if so, would you provide some pointers on how i could go about it? thanks again!

By: Jeremy Wiebe

Jeremy Wiebe — Thu, 04 Sep 2008 15:29:02 +0000

Yes, VB.NET does support Lambdas, but they are a crippled version that you cannot use with the BackgroundWorker component.

In VB.NET Lambdas you cannot use expressions that do not return a value (they must all be functions) and you cannot create multi-line lambdas.

By: matt

matt — Mon, 07 Jul 2008 20:24:02 +0000

Ah, well if you’ve used them in VB.NET then my complete ignorance of VB is showing Best of luck with that. I thought I remembered reading something awhile back about no (or only partial) lambda support in VB but I could be wrong.

By: Flavio Zanellato

Flavio Zanellato — Mon, 07 Jul 2008 20:14:38 +0000

Lambda expressions not supported ?
I have written code in VS2008 (VB.NET) with lambda expressions…

By: matt

matt — Mon, 07 Jul 2008 20:04:04 +0000

Thanks Flavio. Unfortunately you’re out of luck — lambda expressions are not supported in VB.NET. You can always just use a named method, but it’s not as clean or readable as C#.