Handle ModelState Validation in ASP.NET Web API

user_1005030 0
Viewed 132524

I was wondering how I can achieve model validation with ASP.NET Web API. I have my model like so:

public class Enquiry
{
    [Key]
    public int EnquiryId { get; set; }
    [Required]
    public DateTime EnquiryDate { get; set; }
    [Required]
    public string CustomerAccountNumber { get; set; }
    [Required]
    public string ContactName { get; set; }
}

I then have a Post action in my API Controller:

public void Post(Enquiry enquiry)
{
    enquiry.EnquiryDate = DateTime.Now;
    context.DaybookEnquiries.Add(enquiry);
    context.SaveChanges();
}

How do I add if(ModelState.IsValid) and then handle the error message to pass down to the user?

asp.net-web-api c#
11 Answers

Add below code in startup.cs file

services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2).ConfigureApiBehaviorOptions(options =>
            {
                options.InvalidModelStateResponseFactory = (context) =>
                {
                    var errors = context.ModelState.Values.SelectMany(x => x.Errors.Select(p => new ErrorModel()
                   {
                       ErrorCode = ((int)HttpStatusCode.BadRequest).ToString(CultureInfo.CurrentCulture),
                        ErrorMessage = p.ErrorMessage,
                        ServerErrorMessage = string.Empty
                    })).ToList();
                    var result = new BaseResponse
                    {
                        Error = errors,
                        ResponseCode = (int)HttpStatusCode.BadRequest,
                        ResponseMessage = ResponseMessageConstants.VALIDATIONFAIL,

                    };
                    return new BadRequestObjectResult(result);
                };
           });
user_30909130

Put this in the startup.cs file

 services.AddMvc().ConfigureApiBehaviorOptions(options =>
        {
            options.InvalidModelStateResponseFactory = (context) =>
            {
                var errors = context.ModelState.Values.SelectMany(x => x.Errors.Select(p =>p.ErrorMessage)).ToList();                    
                var result = new Response
                {
                    Succeeded = false,
                    ResponseMessage = string.Join(", ",errors)
                };
                return new BadRequestObjectResult(result);
            };
        });
user_97149960
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