CODEWITHSUNDEEP
.net
patrick
patrick

Reputation: 16959

Can you use a .NET 4.0 dll in a 3.5 project?

Can you use a .NET 4.0 dll in a 3.5 project?

Upvotes: 30

Views: 18969

Answers (3)

Mehdi Kiani
Mehdi Kiani

Reputation: 1

https://code.msdn.microsoft.com/Using-a-NET-4-Based-DLL-bb141db3/

Use our .NET 4 DLL via COM

using System; 
using Net4ToNet2Adapter; 

namespace Net2Assembly 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            Console.WriteLine("CLR version from EXE: {0}", Environment.Version); 
            Type myClassAdapterType = Type.GetTypeFromProgID("Net4ToNet2Adapter.MyClassAdapter"); 
            object myClassAdapterInstance = Activator.CreateInstance(myClassAdapterType); 
            IMyClassAdapter myClassAdapter = (IMyClassAdapter)myClassAdapterInstance; 
            myClassAdapter.DoNet4Action(); 
        } 
    } 

}

Upvotes: 0

Darin Dimitrov
Darin Dimitrov

Reputation: 1038770

No you can't. An assembly compiled against .NET 4.0 can be loaded only by the CLR 4.0. On the other hand the CLR 4.0 can load assemblies compiled against .NET 3.5.

Upvotes: 17

ChrisLively
ChrisLively

Reputation: 88054

Nope. You can use a .Net 3.5 assembly in a 4.0 project, but not the other way around.

Upvotes: 26

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