Site now allows promotion codes. If the promotion brings the payment amount to 0 the client doesnt want to require credit card information to be entered. Currently the ViewModels have required on the CC information. Now need to make it conditional. Any way to do this through attributes?Site now allows promotion codes. If the promoti
阅读背景：
如果另一个字段> 0，则需要字段的ASP.NET MVC4 DataAnnotation
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