我可以将属性应用于名称空间的所有成员吗？

Question

I need to apply an attribute (obfuscation related) to all classes in a certain namespace. I'm currently working through the list and doing it by hand, but I'd prefer to do it in a way that it is applied automatically. This would save me some work, but also would ensure that classes added to this namespace in the future will have the attribute as well.

Does C# have any provisions along these lines?

Answer 1

I'm not aware of any built-in facility in .Net that can do it, but you can write one yourself easily using Mono.Cecil here is a method which can inject specified attribute in designated types.

    private static void InjectAttribute<T>(string source,string destination,string nameSpace="")where T:Attribute
    {
        var assembly = AssemblyDefinition.ReadAssembly(source);
        var module = assembly.MainModule;
        var types = module.GetTypes();


        var attributeConstructor = module.Import(typeof (T).GetConstructor(Type.EmptyTypes));

        foreach (var type in types)
        {
            if (type.FullName.StartsWith(nameSpace))
                type.CustomAttributes.Add(new CustomAttribute(attributeConstructor));
        }

        assembly.Write(destination);
    }

and here is a sample Injector Program: (NOTE: I referenced Obfuscate library from my injector program so there is no need to resolve the type for Cecil) :

    private static void Main(string[] args)
    {
        //NOTE:obfuscatelib is already referenced to injector so no need to resolve types
        InjectAttribute<ObfuscationLib.ObfuscateAttribute>(@"assembly path",
            @"injected assembly path","namespace (based on full name)");
    }

you can obtain Mono.Cecil through PM> Install-Package Mono.Cecil Nuget command.