${assembly-version} returns "Could not find entry assembly" in ASP.NET

[304NotModified]

moved from NLog/NLog#275

reported by @slolife:

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the ${assembly-version} layout renderer returns "Could not find entry assembly" in ASP.NET. It seems that:

var assembly = Assembly.GetEntryAssembly();

Returns null in ASP.NET situations.

There is a StackOverflow question/answer that seems to have a solution:

http://stackoverflow.com/a/4803419/698

For myself, I've been able to make it work with:

Assembly assembly = HttpContext.Current == null ? Assembly.GetEntryAssembly() : Assembly.GetExecutingAssembly();

edit:
this only works in the assembly itself

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Steps

If everything works as expected, the layout renderer can be added with the same name to NLog.Web. It should overwrite the one from core. (double check that).

Steps:

• Create a subclass of the current layout renderer in NLog.Web, same name, different namespace.
• Implement proposed code
• Test with unit test in NLog.web

[304NotModified]

We are working on this.

As a work around, since NLog 4.3.7 you can specificy the assembly name, e.g. ${assembly-version:NLogAutloadExtension}. See https://github.com/NLog/NLog/wiki/AssemblyVersion-Layout-Renderer