ASP.NET MVC How to convert ModelState errors to json

Question

How do you get a list of all ModelState error messages? I found this code to get all the keys: ( Returning a list of keys with ModelState errors)

var errorK         


        

Answer 1

Take a look at System.Web.Http.Results.OkNegotiatedContentResult.

It converts whatever you throw into it to JSON.

So I did this

var errorList = ModelState.ToDictionary(kvp => kvp.Key.Replace("model.", ""), kvp => kvp.Value.Errors[0].ErrorMessage);

return Ok(errorList);

This resulted in:

{
  "Email":"The Email field is not a valid e-mail address."
}

I am yet to check what happens when there is more than one error for each field but the point is the OkNegoriatedContentResult is brilliant!

Got the linq/lambda idea from @SLaks