升级到Windows 10后，将构建混合模式程序集

Question

I use small aplication, it works fine on windows 8.1, after I upgrade to windows 10 after run application I get Unhandled exception

System.IO.FileLoadException: Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.

Can I do something with it, without re-compile? I no longer have the source code. Maybe edit MSIL, SetUp old runtime...??

Thanks for help

Answer 1

You should not need recompile app. Should suffice add yourapp.exe.config to same folder with:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <startup useLegacyV2RuntimeActivationPolicy="true">
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
    </startup>
</configuration>

or add to existing config.

if that does not work and you do not have source code, you can decompile app to IL code by

C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6 Tools>ildasm.exe D:\Temp\yourapp.exe /output:D:\Temp\yourapp\yourapp.il

repair runtime version in IL and then compile it

C:\Windows\Microsoft.NET\Framework\v4.0.30319>ilasm.exe D:\Temp\yourapp\yourapp.il /output:D:\Temp\yourappPatch.exe

Answer 2

The main problem is about Windows 8.x still accepts .Net Framework 2.0 compatibility (for ASP purposes, I guess) but Windows 10 refuses it.

I guess you won´t have any solution unless you MUST recompile your app adding the Reference Library and setting up to be put in your application folder.