Beta 13.0 (Release 2) of C#/XAML for HTML5 released

JS-Support @Userware
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Beta 13.0 (Release 2) of C#/XAML for HTML5 released

Postby JS-Support @Userware » Sat Dec 16, 2017 9:18 am

Dear CSHTML5 users,

We are pleased to inform you that the Beta 13.0 of C#/XAML for HTML5 - the extension for Visual Studio that lets you build cross-platform HTML5 apps in standard C# and XAML - is available for download!

UPDATED: v13.0 RELEASE 2 fixes occasional Simulator freezing and "run in browser" text. Download link:

Learn More about C#/XAML for HTML5.

Version 13.0 is basically the same as the intermediate version "12.10", with the following additional improvements:
  • Default app background (and loading screen) is now white rather than gray to be more in line with web pages.
    You can revert to the previous color by simply modifying the file "cshtml5.css" located in "C:\Program Files (x86)\MSBuild\CSharpXamlForHtml5\InternalStuff\Libraries".
  • Added support for Queue<T>
  • The default display size in the Simulator is now "Desktop Browser" rather than "Phone" because there are more users that target desktop browsers
  • The default display size in the XAML Editor is now "Fit Screen" rather than "Phone"
  • A compilation error now appears when you attempt to use "Interop.ExecuteJavaScript" without passing a string literal
  • Fixed the recently introduced feature "Debug JS code executed by the Simulator so far" (located in the Tools menu in bottom-left corner of the Simulator)
  • Fixed freezing that occurred when calling "alert" inside "Interop.ExecuteJavaScript"
  • Improved XAML Inspector in the Simulator
  • Improved exception handling in the Simulator

Version 13.0 also includes the improvements of the intermediate versions 12.1 to 12.10. You may also be interested to read:

Note: with the new WCF stack recently introduced, you can now remove the [XmlSerializerFormat] attribute that is located in the service class (on the server-side) (and don't forget to "update the service reference" in the CSHTML5 app) and benefit from faster application loading, faster WCF, smaller WCF-related output code, and improved compatibility.

Here is a small sample WCF project to test the new WCF stack:
(65.96 KiB) Downloaded 930 times

We are also working on many other features and we will release them as soon as they are ready.

Notes about installation:
  • Before installing this update, it is recommended that you close all the open instances of Visual Studio.
  • If for some reason you need to revert to the previous Beta, simply uninstall this one (from the Control Panel) and reinstall the previous Beta.

We hope you will enjoy this build! If you find any issues, please post them on the forums or send an email to

Thank you.

JS-Support @Userware
Site Admin
Posts: 1142
Joined: Tue Apr 08, 2014 3:42 pm

Re: New Beta 13.0 released! [Download] (UPDATED: RELEASE 2)

Postby JS-Support @Userware » Tue Dec 19, 2017 10:42 am

UPDATE: The download link in the first post was updated with RELEASE 2, which fixes the occasional Simulator freezing, and fixes the misplaced "Run in browser" text.

Posts: 12
Joined: Thu Sep 29, 2016 7:18 am

Re: New Beta 13.0 released! [Download] (UPDATED: RELEASE 2)

Postby Fuzioncode » Fri Dec 29, 2017 12:53 pm

I'm still getting the same error as previous version when running the 12_2 WCF example as shown below or attached:

still error using WCF.PNG
still error using WCF.PNG (145.53 KiB) Viewed 12005 times

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