Validate model on specific string values

Question

I\'m working on a Web API 2 project. besides the requirement that some properties are required, some only can have specific values. One option is that I could try to save the m

Answer 1

you can use reqular expression like this:

[RegularExpression("M|F", ErrorMessage = "The Gender must be either 'M' or 'F' only.")]
public string Gender { get; set; }

but in my api it will show error message when i passed data so you can add

[StringLength(1, MinimumLength = 1, ErrorMessage = "The Gender must be 1 characters.")]

final code:

[StringLength(1, MinimumLength = 1, ErrorMessage = "The Gender must be 1 characters.")]
[RegularExpression("M|F", ErrorMessage = "The Gender must be either 'M' or 'F' only.")]
public string Gender { get; set; }