I'm sure I'm missing something.
I can't work out how to cut and paste from the Console Output Window

Allow the usage of debugging such as stepping into a function, out of a function, run, memory mapping, local variables and the whole nine yards. It is vital if you don't want users to write constantly Console.WriteLine() statements.

Kindly, add debugging!

Please enable vim key bindings. VsVim is one of the most downloaded Visual Studio extension, which is an indication of Vim key binding's popularity among .net devs.

For example: I define a class Person in a fiddle named PersonClass.
Then I base a new fiddle PersonUseExample on existing fiddle PersonClass, so I don't need to declare the class again, just démonstrate how I can use it.

The idea is probably easier to implementis but similar to the exiting request: https://dotnetfiddle.uservoice.com/forums/228764--net-fiddle-ideas/suggestions/6056568-allow-multiple-files-for-console-projects

When try to add nuget package System.Text.Encoding, keep receive error in browser console: common:Uncaught Error:

Uncaught Error: Incorrect version name
at Object.n.addPackage (common:1)
at HTMLAnchorElement.<anonymous> (common:1)
at HTMLBodyElement.dispatch (jquery:1)
at HTMLBodyElement.y.handle (jquery:1)

On top of each fiddle, it says "by <author's user name>". The author's username should be a link to take the user to all his/her fiddles.

Why is the list limited to 10 fiddles? We should be able to see all of them, or at least have a page size option.

Monaco-editor is MIT licensed and made by Microsft.
It's the same text editor used in VSCode, and it is open source!
It also has many interesting features like code diff and editor customization.

See more here:
https://github.com/Microsoft/monaco-editor
https://microsoft.github.io/monaco-editor/playground.html

Hi it would be extremely useful if we had the Elvis operator.

When trying to install System.Xml.XPath from NuGet (any version listed in the menu), installation is not allowed and this message is included at the end of the description of the package: "When using NuGet 3.x this package requires at least version 3.4". I think that updating NuGet is an important and urgent step for the functionality of this site. Gracias!

The following paste is an example of code that compiles in visual studio that does not appear to be supported by dotnetfiddle: https://dotnetfiddle.net/224Hvk

I was just making a quick draft to make sure I understood the way this kind of assignment behaved to find it wouldn't compile on dotnetfiddle

When you add a nuget reference save it in the fiddle so when you open the fiddle again, either on the same machine or a different one, the packages are still there and you don't have to search for them again

Add Web Api 2.2 to list of project type

Add support for collapsible regions

Support for System.ServiceModel would be very helpful.

I get an error when I try to add a reference to System.Data.Entity.Design.PluralizationServices.
'The type of namespace name 'Design' does not exist in the namespace 'System.Data.Entity'

Please give us inverted color theme, most developers are working with "white on black"

We need the same quick keyboard shortcuts as visual studio...
CTRL+D - Duplicate line
CTRL+K+C - Comment out line
CTRL+K+U - Uncomment line
ALT+ENTER - Automatically add or suggest missing namespace reference and add usings to the class (like resharper)

TOTAL IDEA :
1 - Font Size Change
2 - Set Automatic Color Syntax According to Commands (Like Notepad++)
3 - Add C++, Python , JavaScript , ... and more
4 - disable problem always set "Autorun on"
5 - Security Type : Public , Links , Private , Passworded
6 - Graph Output like Draw line.....

allow us to

1) View the compiled razor
2) allow code folding of codetags and collapse/expand code for readability