Compiler Error CS1726
Friend assembly reference 'reference' is invalid. Strong-name signed assemblies must specify a public key in their InternalsVisibleTo declarations.
A strong name signed assembly can only grant friend assembly access, made with the InternalsVisibleToAttribute, to other strongly signed assemblies.
To resolve CS1726, either sign (give a strong name to) the assembly to which you want to grant friend access, or don't grant friend access.
For more information, see Friend Assemblies.
Example
The following sample generates CS1726.
// Save this code as CS1726.cs
// Run the following command to create CS1726.key:
// sn -k CS1726.key
// Then compile by using the following command:
// csc /keyfile:CS1726.key /target:library CS1726.cs
using System.Runtime.CompilerServices;
// The following line causes compiler error CS1726.
[assembly: InternalsVisibleTo("UnsignedAssembly")]
// To get rid of the error, try the following line instead.
//[assembly: InternalsVisibleTo("SignedAssembly, PublicKey=0024000004800000940000000602000000240000525341310004000001000100031d7b6f3abc16c7de526fd67ec2926fe68ed2f9901afbc5f1b6b428bf6cd9086021a0b38b76bc340dc6ab27b65e4a593fa0e60689ac98dd71a12248ca025751d135df7b98c5f9d09172f7b62dabdd302b2a1ae688731ff3fc7a6ab9e8cf39fb73c60667e1b071ef7da5838dc009ae0119a9cbff2c581fc0f2d966b77114b2c4")]
class A { }
See also
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