Show HN: DotNetFiddle – JsFiddle for .Net

http://www.dotnetfiddle.net

by refactormonkey • 13 years ago

217 88 13 years ago

Great tool! I even tried to make an infinite loop (excuse me for that :) ) which was handled gracefully by your program.

duiker101• 13 years ago

Very sweet! I like it a lot! It's nice to see that people still remember of .NET

CmonDev4• 13 years ago

Xamarin and Unity are heavily used and are based on .NET. There is plenty of .NET around, we just don't scream "it's the future!" all the time and do not post [useless] 30-liners. The latter might change now :).

cpayne• 13 years ago

haha! How patronizing...

sspross• 13 years ago

This is executed serverside, right?

refactormonkey10• 13 years ago

Yes, all server-side using several worker agents.

CmonDev4• 13 years ago

Hopefully will change when and if Web becomes actually Open.

guiomie• 13 years ago

Nice ! I support this.

upthedale2• 13 years ago

Great! I was going to say F# should be supported, but then I remembered there's this: http://www.tryfsharp.org/Create

Still, I can definitely see myself using this to share little pieces of code where currently I write it up in linqpad and email to colleagues.

Any chance you could add an extension method like linqpad's Dump() to pretty print objects?

refactormonkey10• 13 years ago

Yes, that sounds like a great idea. Will add it in next couple of days.

jonkemp2• 13 years ago

Doesn’t seem to work in IE10 ironically.

gavinpc• 13 years ago

If the page is completely blank, it may be because you have cookies blocked.

jonkemp2• 13 years ago

Nevermind. It was IE. Somehow 'Display all websites in Compatibility View' was turned on. Turning it off fixed it. Thanks.

defcon842• 13 years ago

'Roslyn'?

refactormonkey10• 13 years ago

Yep. It is pretty amazing library.

defcon842• 13 years ago

interesting :)

jokecamp• 13 years ago

Was it only Roslyn or did you utilize ScriptCS too?

drharris• 13 years ago

Very nice! I have a "scratchpad" project for fiddling around with things, but this might wind up a permanent tab on my browser. Less overhead than a VS project, for sure.

upthedale2• 13 years ago

Try Linqpad for a scratchpad too. Don't let the linq name fool you - its great for general purpose fiddling about. It has been truly indispensable when developing on .Net.

http://www.linqpad.net

ygra• 13 years ago

I usually use PowerShell for fiddling which is often nice enough for trying out things with the BCL.

taude• 13 years ago

Back when I worked with .NET and Linq, I was a fan of this tool

pacaro• 13 years ago

If I'm in VS, I just use the F# interactive window. Even when I'm not coding in F# it's always nice to have a repl around.

If I'm playing with data and still want to poke .Net objects, I use Sho[1] which gives an IronPython REPL and some decent numerics support

[1] http://research.microsoft.com/en-us/projects/sho/

MichaelGG• 13 years ago

Mono ships with a C# REPL: http://www.mono-project.com/CsharpRepl

After using F# and having F# Interactive onhand, I cannot imagine working without a REPL. There's so many small things that become simple to check if you've got a REPL handy.

CSDude• 13 years ago

What kind of hardware are you using? Are the jobs parallel? I do not know about .NET very much, but it seems very slow. Would that be feasbile for you to maintain this?

refactormonkey10• 13 years ago

Using Azure cloud - medium Web Role server (2 x 1.6GHz CPU, 3.5GB RAM). It is set to auto-scaling so it should be adding new instances if first server is being swamped.

The jobs are done using Worker processes and there could be up to 20 of them running at the same time.

_random_3• 13 years ago

.NET CLR is faster then most VMs.

gnaritas• 13 years ago

Than, not then.

chrisbridgett• 13 years ago

Nice. It's a shame http://fiddle.net wasn't available.

CmonDev4• 13 years ago

On the other hand there will be consistency once wee see more languages/platforms. javafiddle.net? dartfiddle.net?

CmonDev4• 13 years ago

So cool, thank you!

Rudism• 13 years ago

This is really neat. Adding something like LinqPad's Dump() extension method would make this supercool.

philliphaydon4• 13 years ago

This is super awesome! I was thinking of building something like this the other day because I wanted to test some code and not make a new test console app.

Totally awesome!

doktorn• 13 years ago

As stated elsewhere linqpad is really great for testing ad-hoc, throwaway C# code (much more than just linq expressions). It kind of like a REPL for .net.

rjbwork• 13 years ago

If you're doing any Entity Framework development, you should be using LinqPad and checking generated SQL for pretty much every canned (read re-used, not inline) query you write. Somethings can be unexpectedly ugly and badly performing if not optimized properly.

wehadfun• 13 years ago

Very useful. This will be a great way to answer questions and demo algorithms

phaed• 13 years ago

Love it!

acc002• 13 years ago

While this one doesn't have the nice "fiddle" suffix, it has been around for a while and supports a lot of platforms:

http://ideone.com/

HarshaThota• 13 years ago

There is also https://compilify.net/ and http://executify.com/. But it's always good to have more options.

philliphaydon4• 13 years ago

compilify seems to take a long time to compile code :(

slowmover• 13 years ago

Huh, first time I've seen this one, very interesting. Any idea what kind of volume they handle and whether or not they're profitable?

acc002• 13 years ago

I doubt they're profitable (yet), they have only started playing with business models recently.

But the same platform has been used to run spoj.pl, a rather popular programming contest site, for many years.

ykumar6• 13 years ago

We do something similar at http://runnable.com/.NET We run mono however on the back-end

codehead• 13 years ago

There's also https://jitjot.net

The blog entry explaining how to use it is here: http://sbknull.blogspot.com

It's built on ASP.net MVC. We're thinking of open sourcing it.

It saves a new version of your code with each save and you have a repository of code entries via your user link:

https://jitjot.net/u/acoma https://jitjot.net/u/mlatham

Of course you can just park code there if you'd like.

SanjayUttam• 13 years ago

Also http://www.coderun.com/ide/

codygator• 13 years ago

Hey I love your auto-complete !

philliphaydon4• 13 years ago

O M G

Collaboration coding in the browser is SERIOUSLY cool!

bpicolo• 13 years ago

JSFiddle has had this for a while.

philliphaydon4• 13 years ago

But for .NET, that's what makes it neater. JSFiddle collab has been helpful, now we have it in .NET too :D

_random_3• 13 years ago

Good for GUI, but for business logic we need the real deal :).

louthy4• 13 years ago

VSAnywhere is good for that on live projects.

https://vsanywhere.com

(no affiliation)

smartdonkey2• 13 years ago

you should then try http://liveweave.com. they have code-hinting for HTML5, CSS3, JS, jQuery...really awesome stuff. I recently found it, and loving it so far.

filearts2• 13 years ago

If you're into the js/html/css party, Plunker is a more IDE-like experience that has real-time collaboration built-in.

http://plnkr.co/edit/?p=preview&s=RxFWQJqa5yVe8qI5

mandeepj• 13 years ago

This is really great. Infact you gave it edge over jsfiddle by providing collaborate, auto-complete and compile-as-you-type features.

There are times when I quickly want to test some idea with strings, async, linq etc. without firing full fledged VS IDE. You did an excellent job. Cheers!

sremani• 13 years ago

Really nice, I can see myself using this tool. Couple of pointers - when typing fast (my usual programming speed), its going a bit awry, but I see it is trying to do some intellisense stuff.

This is perfect tool for teaching/learning coding.

manojlds• 13 years ago

Is it open source? If not, is there any plans of making it?

dsschnau• 13 years ago

Oh my goodness this is amazing. I've wanted this my whole career.

orenbarzilai2• 13 years ago

Is it compiled in server side?

refactormonkey10• 13 years ago

Yes, website passes Run requests to back-end worker processes which compile and execute code and return results back to website for display.

orenbarzilai2• 13 years ago

I assume that you have created some kind of sand box in order to prevent malicious code execution. Can you share some details about that?

ctekin• 13 years ago

Is intellisense case-sensitive for a reason? I typed "Console.w" and auto-complete list was gone. It works fine with "Console.W".

refactormonkey10• 13 years ago

Thanks for mentioning it. Will fix...

NKCSS• 13 years ago

Boohoo, any file access is disabled, and any Environment.GetFolderPath will return an empty string (except System, which throws a security violation) :P

refactormonkey10• 13 years ago

We may look to add local storage sandbox for this.

voltagex_• 13 years ago

IsolatedStorage may work well for this.

louthy4• 13 years ago

This is great. One small bug cropped up, I collaborated on a fiddle with a work colleague and he couldn't see any output from clicking Run.

http://www.dotnetfiddle.net/lN6m0S

Great work though, will be in my favourites :)

refactormonkey10• 13 years ago

Yes, will be fixed by tomorrow. Thanks for reporting it.

louthy4• 13 years ago

Good stuff!

platz• 13 years ago

Those are some curious methods, but I'm not sure the names fold and foldback are appropriate given what they actually do.

louthy4• 13 years ago

You're right, they don't work. I was flattening recursive versions of Fold and FoldBack as a test of DotNetFiddle. Clearly the flattening has bugs :)

hudo• 13 years ago

It would be great to see (somehow) method params, types. Intellisense is great, but I'm really missing method signature ... Great work guys, thank you for this!

IvanK_net• 13 years ago

Nice try, closed-source proprietary technologies! (Hope that at least they run it in Mono)

jayhoon• 13 years ago

Hmm, what part of C# or CLI is closed? They are open standards - you are free to create your own compiler and environment.

smortaz• 13 years ago

very nice. please add IronPython & F# if you get a chance :)

victorin• 13 years ago

This is really awesome, good job!

I've found a minor glitch. Seems that the Intellisense (auto-complete) does not work when I try to call a custom class method inline, like:

Console.WriteLine("Hello World, " + new MyClass().PrintTestSentence());

(Public methods of class "MyClass" does not show up there)

See here: http://www.dotnetfiddle.net/5oF8oR

refactormonkey10• 13 years ago

Thanks for reporting it!

It works if you declare class first http://www.dotnetfiddle.net/IjtjcG

but not if u do initialization and call at the same time. Will take a look.

jorgem• 13 years ago

Also, "intellisense" for the "using" statement doesnt work.

Example:

   using System.

I don't get any choices...

fekberg• 13 years ago

Nice work! Is this inspired by Compilify? How are you securing execution? Source? I did a blog post a long time ago on hosted execution with Roslyn and that is how we do it with Compilify (which is open source).

refactormonkey10• 13 years ago

Yeah we definitely looked at some Complify code and the blog post was helpful also.

kmfrk• 13 years ago

Here's one for R:

http://www.r-fiddle.org/

talles• 13 years ago

Great pretty handy. You even got auto complete, kudos.

smartdonkey2• 13 years ago

http://liveweave.com is by far the best HTML/CSS/JS playground out there. you guys should totally try it out.

_random_3• 13 years ago

I can name three problems with it straight-away: 1) HTML, 2) CSS, 3) JS.

The original post is about a decent language, not the ubiquitous ones.

filearts2• 13 years ago

Honest question: Why?

browserspot• 13 years ago

I think I can answer that. IMHO Liveweave has something most of the other JS "playgrounds" do not have. It has context-sensitive code-hinting for core JavaScript and jQuery...also for CSS/HTML/HTML5/CSS3. Personally, I think this makes a huge difference, at least for me and may be some others.

Varcht• 13 years ago

Pretty cool, nested classes do not work though. Throws "Method must have a return type".

michaelcullina• 13 years ago

Wow! Very good.

phill_andrade• 13 years ago

Great! I totally bookmarked this!

Show HN: DotNetFiddle – JsFiddle for .Net

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