DataAnnotation for Required property

Question

First it works, but today it failed!

This is how I define the date property:

[Display(Name = \"Date\")]
[Required(ErrorMessage = \"Date of Submissio         


        

Answer 1

I have added a ModelValidationFilterAttribute and made it work:

public class ModelValidationFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (!actionContext.ModelState.IsValid)
        {
            // Return the validation errors in the response body.
            var errors = new Dictionary>();
            //string key;
            foreach (KeyValuePair keyValue in actionContext.ModelState)
            {
                //key = keyValue.Key.Substring(keyValue.Key.IndexOf('.') + 1);
                errors[keyValue.Key] = keyValue.Value.Errors.Select(e => e.ErrorMessage);
            }
            //var errors = actionContext.ModelState
            //    .Where(e => e.Value.Errors.Count > 0)
            //    .Select(e => new Error
            //    {
            //        Name = e.Key,
            //        Message = e.Value.Errors.First().ErrorMessage
            //    }).ToArray();

            actionContext.Response =
                actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, errors);
        }
    }
}

You can either add [ModelValidation] filter on the actions. Or add it into Global.asax.cs:

GlobalConfiguration.Configuration.Services.RemoveAll(
typeof(System.Web.Http.Validation.ModelValidatorProvider),
v => v is InvalidModelValidatorProvider);

In this way, I continue to use the original data annotation.

Reference