Mixed mode assembly is built against version ‘v2.0.50727′ of the runtime
I'm getting the following exception:
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.
as I was trying to export crystal report from my WPF program...
I have added the following in the app.config already...
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
<runtime>
<NetFx40_LegacySecurityPolicy enabled="true"/>
</runtime>
Any experts can help????
Reference I found: http://www.davidmoore.info/2010/12/17/running-net-2-runtime-applications-under-the-net-4-runtime
尝试在配置节点下的app.config中使用这个确切的启动标记
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
<requiredRuntime version="v4.0.20506" />
</startup>
The exception clearly identifies some .NET 2.0.50727 component was included in .NET 4.0. In App.config file use this:
<startup useLegacyV2RuntimeActivationPolicy="true" />
It solved my problem
I actually had this identical issue with the inverse solution. I had upgraded a .NET project to .NET 4.0 and then reverted back to .NET 3.5. The app.config in my project continued to have the following which was causing the above error in question:
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
The solution to solve the error for this was to revert it back to the proper 2.0 reference as follows:
<startup>
<supportedRuntime version="v2.0.50727"/>
</startup>
So if a downgrade is producing the above error, you might need to back up the .NET Framework supported version.
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