如何在同一解决方案中使用2个不同的log4net程序集 - 每个程序集针对不同版本的.Net Framework？

Question

My question is closely related to the one

Log4Net : 2 libraries need 2 different version of it

but slightly different.

While our Main EXE is compiled with .Net Framework 4.0, some of the referenced assemblies are compiled for Framework v2.0 and we have to add logging within those assemblies as well. While we had chosen log4net v1.2.11 (the latest, I believe), we are hitting a road-block in using the 2 different assembles in our solution.

Answer 1

First off, you can't have all of the dll's in the same folder (as you already found).

Here it's explained how the runtime tries to load the assembly.

Using this knowledge, you could:

• Redirect assembly versions (if they are compatible, which I think they are) - eg from old log4net dll to the new dll

• Specify assemlby location that should be used when loading assemblies (eg put it in \\Libs folder, and reference that)

• Load the assembly manually - theoretically, this could work because it's loading that assembly into the domain.

One example, taken from here ("Multiple Assemblies with the Same Name"):

<dependentAssembly>
  <assemblyIdentity name="Server" publicKeyToken="c0305c36380ba429" /> 
     <codeBase version="1.0.0.0" href="v1/Server.dll"/>
     <codeBase version="2.0.0.0" href="v2/Server.dll"/>
</dependentAssembly>

Answer 2

我认为只使用针对.net 2.0的版本是安全的。

Answer 3

You can use this section

<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="2.0" />
  </startup>
</configuration>

Link : http://msdn.microsoft.com/fr-fr/library/vstudio/bbx34a2h.aspx

Link : http://msdn.microsoft.com/en-us/library/w4atty68(v=vs.71).aspx