How can I remove magic strings from custom model binders?

Question

I've written a couple of custom model binders now, and have realised that I've fallen into the trap of relying on magic strings, e.g.:

    if (bindingContext.ValueProvider.ContainsPrefix("PaymentKey"))
    {
        paymentKey = bindingContext.ValueProvider.GetValue("PaymentKey").AttemptedValue;
    }

I'd like to be able to use an expression to strongly-type the prefix names, but can't figure out how, and would be grateful for some assistance.

Thanks.

Answer 1

What you are looking for is bindingContext.ModelName so your code could become:

 if (bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))
    {
        paymentKey = bindingContext.ValueProvider.GetValue(bindingContext.ModelName).AttemptedValue;
    }