unmanaged code in C#

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Hello,
Can anyone help me with this error? It occurs when I try to instantiate a class from a DLL in unsafe mode in VS2010

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.

Posted 27-Mar-12 12:35pm

shekarchee

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El_Codero · Accepted Answer · 2012-03-27T12:48:00

Solution 1

Hi,

the DLL is compiled to v2.0.50727 of .NET, your project is .NET 4.0.

you need to set mixed mode assembly in app.config.

XML

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

With best Regards.

Posted 27-Mar-12 12:48pm

El_Codero

Comments

Sergey Alexandrovich Kryukov 27-Mar-12 19:42pm

Correct explanation, my 5; I credited it in my answer, where I also explain the unsafe vs. managed, please see.
--SA

Wonde Tadesse 27-Mar-12 19:49pm

5+

El_Codero 27-Mar-12 20:03pm

Thanks for credits and votes! Good addition, important point SA.

Sergey Alexandrovich Kryukov · Accepted Answer · 2012-03-27T13:41:00

Solution 2

In addition to the correct explanation by Björn Ranft:

Unsafe code does not mean unmanaged. In unsafe code, you can pin data and use pointers. It does not make the code unmanaged. C# code is always managed.
Please see:
http://msdn.microsoft.com/en-us/library/chfa2zb8%28v=vs.71%29.aspx[^].

—SA

Posted 27-Mar-12 13:41pm

Sergey Alexandrovich Kryukov

Comments

Wonde Tadesse 27-Mar-12 19:49pm

5+

Sergey Alexandrovich Kryukov 27-Mar-12 21:20pm

Thank you, Wonde.
--SA