Running Javascript.Net in a ASP.NET Web Applications about javascript.net

[spahnke]

We use this library in a ASP.NET web application on .NET Framework successfully for a while now. From what we've learned over the years the following things are typically the cause of those errors.

IIS has to run in 64 bit mode

Should be self explanatory, this holds for both IIS and IIS Express (make sure to tick the box in the VS settings).

Missing Visual C++ Redistributable

You must have the Visual C++ Redistributable package installed on the target machine. This can be checked easily by compiling the included Fiddling project (as 64 bit exe) and running that on the target machine.

Running into assembly load problems in IIS

IIS/IIS Express attempts to load every assembly present in the bin/ folder, including the unmanaged V8 specific ones. This led to similar errors for us before. We solved that problem by not including the JavaScript.Net.dll and other V8 assemblies in the bin/ folder, but instead deploying those into a sibling folder. You can then use the AssemblyResolve callback on the AppDomain to resolve JavaScript.Net.dll from the sibling folder (see e.g. https://stackoverflow.com/a/5262129). This is typically setup in the Global.asax.cs.

Edit: Now that I'm at work here is the snippet we use

var serverPath = System.Web.HttpContext.Current.Server.MapPath("/");
AppDomain.CurrentDomain.AssemblyResolve += (sender, args)
    => args.Name.StartsWith("JavaScript.Net") ? Assembly.LoadFrom(serverPath, @"V8\JavaScript.Net.dll")) : null;

WebApp
    |--bin
        |--...
    |--V8
        |--JavaScript.Net.dll
        |--icuuc.dll
        |--...

Good luck!

[oliverbock]

You will need to include all those files in the same directory as the JavaScriptDotNet.dll, but you've probably already tried that.

[Uncreal]

Yes i tryed that. I basically copied all the settings from the working console application to new web application but i get a dependency error on JavaScript.Net.dll. I saw with the Assembly Binding Log Viewer that ASP.Net could not load icuuc.dll and icui18n.dll so i guess thats the problem.

[oliverbock]

Did you copy the 64-bit DLLs? Most servers are running 64 bit.

[Uncreal]

Yes i tryed everything. Is it possible to build Javascript.Net as one single dll with everything inside?
Thx for your help.

[Uncreal]

@spahnke Thank you very much! You helped a lot!