Validate a bool that must be true using xVal?

I created a TrueTypeAttribute for this sort of situation.

XVal treats a required field dataannotation on a checkbox, as must be checked. I had to work around this situation recently as I was trying to represent a non-nullable boolean where the checkbox could be true or false (just not null). But in your case this works out perfectly.

However, it gives a required field validation message where you are perhaps looking for a "must accept these terms" type message.

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