Log4net public token issues (could not load file or assembly)

Questions
1

We have some packages (and external modules) which we use who are using log4net.
But after installing these packages we have the following error:
Could not load file or assembly 'log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

Apparently umbraco depends on a log4net version without public key and the log4net (nuget package) has public key.

To use both log4net assemblies I solved this like this:

  1. get the umbraco version of log4net.dll and move it to a new folder: bin\log4net-1.2.11-nokey
  2. pull the new log4net nuget package (which is signed with a new key)
  3. Add the code below to the assemblyBinding section of the web.config:

if you recompiled the log4net dll, you might need to update the publicKeyToken (you can use dotpeek or ILspy to find the publicKey easily.

<dependentAssembly>
        <assemblyIdentity name="log4net" publicKeyToken="null" culture="neutral"  />
        <codeBase version="1.2.11.0" href="bin\log4net-1.2.11-nokey\log4net.dll" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="log4net" publicKeyToken="669e0ddf0bb1aa2a" />
          <bindingRedirect oldVersion="0.0.0.0-1.2.10.0" newVersion="1.2.11.0"/>
          <codeBase version="1.2.11.0" href="log4net.dll" />
      </dependentAssembly>

Hope it helps someone!

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/45996-log4net-public-token-issues-could-not-load-file-or-assembly