How to add my own methods to Guard?

[Kilazur]

I'd like to create custom guard methods but be able to use them transparently as if they were native from the original NuGet package.

Example:

void MyMethod(string[] values)
{
    Guard.IsNotNullOrEmpty(values);
    Guard.AllValid(values);
}

// ???
public static void IsNotNullOrEmpty(this Guard guard, string[] values, [CallerMemberName] name = "")
{
    Guard.IsNotNull(values);
    Guard.IsNotEmpty(values);
}

public static void AllValid(this Guard guard, string[] values, [CallerMemberName] name = "")
{
    if (values.Any(v => v.Length < 4)
    {
        throw new ArgumentException...
    }
}

But Guard being a static type, it cannot be extended. And you cannot taker advantage of partial from types in another assembly.

Am I doomed to not do this?

[hawkerm]

You'd just have to create your own static class for now.

Eventually C# will get some extension feature that allows you to add on to a static class, but that's been coming soon for a while now. (Sometimes referred to as "Extension everything" in the past, but then got superseded by "roles", I believe that discussion had happened here: dotnet/csharplang#5485)

They're doing some restructuring on the C# repo, so I don't even know where the latest info tracking its status is, this was the best I could find as a pointer: dotnet/csharplang#8431