model-validation

I'm implementing a REST API project using ASP.NET Core MVC 2.0, and I'd like to return a 400 status code if model binding failed (because the request is syntactically wrong) and a 422 status code if model validation failed (because the request is syntactically correct but contains unacceptable values). As an example, given an action like [HttpPut("{id}")] public async Task<IActionResult> UpdateAsync( [FromRoute] int id, [FromBody] ThingModel model) I'd like to return a 400 status code when the id parameter in the route contains a non-digit character or when no body has been specified in the

I have setup a custom provider to allow setting validation attributes from a data store instead of in static code. Works great with the client side validation in my .NET MVC 4 project, but I am unable to get the server side validation to work. CustomModelValidatorProvider .cs: public class CustomModelValidatorProvider : DataAnnotationsModelValidatorProvider { protected override IEnumerable GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable attributes) { // set attributes from datastore here return base.GetValidators(metadata, context, attributes); } } In my Global

I have following property in my Model Metadata class: [Required(ErrorMessage = "Spent On is required")] [RegularExpression(@"[0-1][0-9]/[0-3][0-9]/20[12][0-9]", ErrorMessage = "Please enter date in mm/dd/yyyy format")] [DataType(DataType.Date)] [DisplayName("Spent On")] public DateTime SpentOn { get; set; } But whenever I call ModelState.IsValid it always returns false because regex is not validating. I have matched the entered date (08/29/2010) against new regex using same pattern and it matches perfectly. What am I doing wrong? Darin Dimitrov That's because regex applies to strings and not

I am trying to use Model Validation in MVC .Net Core and can't manage to replace this default error message 'The value '' is invalid'. In theory, we can replace our own custom error message by using ErrorMessage Annotation in the Model. But I couldn't find a way to make this one work. My Model [Required(ErrorMessage = "Date Required")] [DataType(DataType.Date, ErrorMessage = "Invalid Date Format")] [Display(Name = "Appointment Date")] [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)] public DateTime AppointmentDate { get; set; } I put different ErrorMessage for

I have developed a custom validator Attribute class for checking Integer values in my model classes. But the problem is this class is not working. I have debugged my code but the breakpoint is not hit during debugging the code. Here is my code: public class ValidateIntegerValueAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { if (value != null) { int output; var isInteger = int.TryParse(value.ToString(), out output); if (!isInteger) { return new ValidationResult("Must be a Integer number"); } } return