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I am building an application using ASP.NET Core MVC and I have the requirement of having dynamic Data annotations for some fields. For instance, the data annotation [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long", MinimumLength = 3)] I am using on an input type text, in some cases when the page is open must be 3 in other cases it must be 6.

How can I achieve this dynamically?

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  • Does the validation need to be handled with real time validation, or can it be a response from the server? Also, where are the dynamic values coming from? Commented Sep 8, 2017 at 3:57
  • @WillRay Yes, it has to be real time validation and the values are coming from the database. I intend to have editable fields where I can set the maximum and minimum string length and save it in to the database Commented Sep 8, 2017 at 10:09
  • Your easiest solution might be to use the RemoteAttribute, and use the injection for controllers to check the length. Commented Sep 10, 2017 at 23:02
  • @WillRay thanks! I haven´t tried it yet but this seems like a solution. I´ll write an answer once I try it and works Commented Sep 18, 2017 at 18:05
  • I can create a sample demonstrating it's implementation in an answer, if that would be helpful for you? Commented Sep 20, 2017 at 1:56
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