Forcing named arguments in C#

Question

C# 4 introduced a feature called named arguments which is especially useful in scenarios like

int RegisterUser(string nameFirst, string nameLast, string nameMidd         


        

Answer 1

I'm using another method. In my setup I have 1 parameter which I always expect, then come a bunch of optional strings which I really want to be sure the user chose actively. So my first string in this list is a "trap" value, which if set, throws an error. Like this:

    public HtmlString Toolbar(DynamicEntity target = null, string dontRelyOnParameterOrder = Constants.RandomProtectionParameter, string actions = null, string contentType = null, object prefill = null)
    {
        if (!Enabled) return null;
        protectAgainstMissingParameterNames(dontRelyOnParameterOrder);

        var toolbar = new ItemToolbar(target, actions, contentType, prefill);

        return new HtmlString(toolbar.Toolbar);
    }

    private void protectAgainstMissingParameterNames(string criticalParameter)
    {
        if(criticalParameter != Constants.RandomProtectionParameter)
            throw new Exception("when using the toolbar command, please use named parameters - otherwise you are relying on the parameter order staying the same.");

    }

Hope you like it :)