Using `dynamic` keyword in C# doesn't compile

Question

I'm trying to compile a piece of C# code that contains the dynamic keyword. (I need this keyword for using ironpython.) However, it doesn't compile, complaining that

error CS1980: Dynamic keyword requires 
`System.Runtime.CompilerServices.DynamicAttribute' to be defined.
Are you missing System.Core.dll assembly reference?

The compiler I'm using is Mono JIT compiler version 2.10.8.1. I don't have System.Runtime.CompilerServices.DynamicAttribute in the list of possible references.

How can I make mono accept the dynamic keyword?

Did you add references to System.Core.dll, Microsoft.Dynamic.dll and Microsoft.CSharp.dll? — TimothyP
– TimothyP, Commented Sep 22, 2013 at 13:26
You need to enable the C# 4 profile, sounds like you didn't. Google "__enable_profile4=yes" — Hans Passant
– Hans Passant, Commented Sep 22, 2013 at 14:13
Thanks, I started working on an existing project that appeared configured to work with C# 2.0. -_- — chtenb
– chtenb, Commented Sep 22, 2013 at 14:17

Mafii · Accepted Answer · 2017-01-20 13:09:42Z

3

This comment of Hans Passant solved the problem:

You need to enable the C# 4 profile, sounds like you didn't. Google "__enable_profile4=yes"

edited Jan 20, 2017 at 13:09

Mafii

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answered Mar 26, 2015 at 0:15

chtenb

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