How Can I Achieve C# Equivalence to C 's 'Friend' Keyword?

C# Equivalent of the "Friend" Keyword

In C , you can use the "friend" keyword to grant access to private members of a class to other classes. However, this feature is not directly supported in C#. Instead, the InternalsVisibleTo attribute provides a partial equivalent for accessing private members across assemblies.

How to Use InternalsVisibleTo

To enable a class in another assembly to access private members, you can add the InternalsVisibleTo attribute to the assembly manifest. For example, in the AssemblyInfo.cs file, you can use the following code:

[assembly: InternalsVisibleTo("OtherAssembly")]

This attribute makes the internals of your assembly visible to the assembly named "OtherAssembly."

Example

Consider the following class:

internal class TestClass
{
    private int privateValue;
}

In a separate assembly, you can create a class to access the privateValue:

public class TesterClass
{
    public void DoSomething(TestClass instance)
    {
        // Set the value using reflection
        instance.GetType().GetField("privateValue", 
            BindingFlags.NonPublic | 
            BindingFlags.Instance).SetValue(instance, 10);
    }
}

By using reflection and the InternalsVisibleTo attribute, you can access private members across assemblies for specific scenarios, such as testing.

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